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Transcriber's note: Table of Contents added by Transcriber.




CONTENTS


  Chapters on the Stars                                              227

  Preventive Inoculation. (II.)                                      240

  Colonies and the Mother Country. (II.)                             248

  Technical Education at the Massachusetts Institute of
      Technology                                                     257

  The Psychology of Crazes                                           285

  Some Phases of the Earth's Development in the Light of Recent
      Chemical Research                                              295

  A Preliminary Account of the Solar Eclipse of May 28, 1900,
      As Observed by the Smithsonian Expedition                      302

  Malaria and the Malarial Parasite                                  310

  New Sources of Light and of Rontgen Rays                           318

  Discussion and Correspondence                                      323

  Scientific Literature                                              327

  The Progress of Science                                            332




  THE
  POPULAR SCIENCE
  MONTHLY

  EDITED BY
  J. McKEEN CATTELL

  VOL. LVII

  MAY TO OCTOBER, 1900

  NEW YORK AND LONDON
  McCLURE, PHILLIPS AND COMPANY
  1900




  COPYRIGHT, 1900,
  BY McCLURE, PHILLIPS AND COMPANY.

[Illustration: PRESIDENT G. K. GILBERT,

AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE.]




  THE
  POPULAR SCIENCE
  MONTHLY.

JULY, 1900.




CHAPTERS ON THE STARS.

BY PROFESSOR SIMON NEWCOMB.


I. INTRODUCTORY.

It would be difficult to name any subject of investigation, the
progress of which during our time has been more remarkable than that in
the field of stellar astronomy. Several features of this progress are
especially noteworthy. One of these is the mere extension of research.
A natural result of the northern hemisphere being the home of civilized
peoples was that, thirty years ago, the study of the southern heavens
had been comparatively neglected. It is true that the curiosity of
the inquiring astronomers of the past would not be satisfied without
their knowing something of what was to be seen south of the equator.
Various enterprises and establishments had therefore contributed to
our knowledge of the region in question. As far back as 1667, during
a voyage to St. Helena, Halley catalogued the brighter stars in the
region near the South Pole. About 1750 Lacaille, of France, established
an observing station at the Cape of Good Hope, and made a catalogue
of several thousand stars which has remained a handy book for the
astronomer up to the present time. In 1834-38 Sir John Herschel made a
special voyage to the Cape of Good Hope, armed with the best telescopes
which the genius of his father had shown him how to construct, for
the purpose of doing for the southern heavens as much as possible of
what his father had done for the northern. The work of this expedition
forms one of the most important and interesting chapters in the history
of astronomic science. Not only is Herschel's magnificent volume a
classic of astronomy, but the observations which it contains are still
as carefully and profitably studied as any that have since been made.
They may be said to form the basis of our present knowledge of the
region which they included in their scope.

Herschel's work may be described as principally in the nature of
an exploration. He had no instruments for accurately determining
the positions of stars. In the latter field the first important
contributions after Lacaille were made by Sir Thomas Brisbane, Governor
of New South Wales, and Rumker, his assistant, at Paramata. Johnson, of
England, about 1830, introduced modern accuracy into the construction
of a rather limited catalogue of stars which he observed at St.
Helena. About the same time the British Government established the
observatory at the Cape of Good Hope, which has maintained its activity
to the present time, though, at first, its means were extremely
limited. About the middle of the century the Government of New South
Wales established, first at Williamstown and then at Melbourne, an
observatory which has worked in the same field with marked success.

An American enterprise in the same direction was that of Captain James
M. Gilliss, who, in 1849, organized an astronomical expedition to
Chili. The principal motive of this enterprise was the determining of
the solar parallax by observations upon Venus and Mars near the time
of their nearest approach to the earth. As these observations would
take but a small part of his time, Gilliss determined to take with him
instruments for determining the positions of the stars. He established
his observatory at a point near Santiago, where he continued his
observations for nearly three years. He was a practical observer,
but an untoward circumstance detracted from the value of his work.
His observatory was built upon a rocky eminence, a foundation which
seemed to afford the best possible guarantee of the stability of his
instruments. He made no attempt to reduce his observations till after
his return home. Then it was found that the foundation, through the
expansion and contraction due to the heat of the sun, was subject to a
diurnal change which made it extremely difficult to derive good results
from his careful work. It was not until 1896, more than thirty years
after his death, that the catalogue of the stars observed by him was at
last completed and published.

We do not derogate in any way from the merit of these efforts in saying
that they could not lead to results comparable with those of the score
of richly equipped northern observatories which the leading nations
and universities of Europe had endowed and supported for more than a
hundred years. Only within the last thirty years has it been possible
to bring our knowledge of the southern heavens up to a satisfactory
stage. Now, however, the progress of southern astronomy, if we may use
the term, is such that in several points our knowledge of the southern
heavens surpasses that of the northern ones. If we measure institutions
by the importance of the work they are doing, there are several in the
southern hemisphere which must to-day be placed in the first rank.

The history and work of the Cordova Observatory are of special
interest. In 1870 Dr. B. A. Gould, who might fairly be considered
as the father of modern American astronomy, conceived the idea of
establishing an observatory of the first class in South America. He
found the President and Governor of the Argentine Republic ready to
support his scheme with a liberality well fitted to impress us with
a high sense of their standard of civilization. In a year or two the
observatory at Cordova was in active operation. A statement of its work
belongs to a subsequent chapter. Suffice it to remark here that Dr.
Gould continued in active charge until 1885, when he returned home, and
was succeeded by Thome, the present director.

A few years after Gould went to Cordova, Gill was made director of the
Royal Observatory at the Cape of Good Hope. The rapid growth of this
institution to one of the first rank is due no less to the scientific
ability of the new director than to the unflagging energy which he has
devoted to the enlargement of the resources of the institution. The
great fact which he sought to impress upon his supporters was that
the southern celestial hemisphere was as large as the northern, and
therefore equally worthy of study.

In any general review of the progress of stellar astronomy during the
past twenty years, we should find Harvard University before us at every
turn. What it has done will be seen, perhaps in an imperfect way, in
subsequent chapters. Not satisfied with the northern hemisphere, it
has established a branch at Arequipa, Peru, in which its methods of
observation and research are extended to the south celestial pole.
Its principal specialties have been the continuous exploration of the
heavens. Celestial photography, photometry and spectroscopy sum up its
fields of activity. For more than ten years it might be almost said
that a sleepless watch of the heavens has been kept up by an all-seeing
photographic eye, with an accuracy of which the world has hardly had
a conception. The completeness with which its work has been done has
recently been shown in a striking way. Our readers are doubtless
acquainted with the singular character of the minor planet Eros, whose
orbit passes through that of Mars, as one link of a chain passes
through another, and which comes nearer the earth at certain times than
any other celestial body, the moon excepted. When the character of
the orbit became established, it was of interest to know whether the
planet had ever been observed as a fixed star at former oppositions.
Chandler, having computed the path of the planet at the most important
of the oppositions, beginning with 1892-94, communicated his results to
Director Pickering, and suggested a search of the Harvard photographs
to see if the planet could be found on them. The result was the
discovery of the planet upon more than a score of plates taken at
various times during the preceding ten years. New stars were formerly
supposed to be of very rare occurrence, but since the Harvard system of
photographing the heavens has been introduced, no less than three have
been known to break out.

The great revelations of our times have come through the application
of the spectroscope to the measurement of motions in the line of sight
from us to a star. No achievement of the intellect of man would have
seemed farther without the range of possibility to the thinker of half
a century ago, than the discoveries of invisible bodies which are now
being made with this instrument. The revelations of the telescope
take us by surprise. But, if we consider what the thinker alluded to
might regard as attainable, they are far surpassed by those of the
spectroscope. The dark bodies, planets, we may call them, which are
revolving round the stars, must be forever invisible in any telescope
that it would be possible to construct. They would remain invisible if
the power of the instrument were increased ten thousand times. And yet,
if there are inhabitants on these planets, our astronomers could tell
them more of the motions of the world on which they live than the human
race knew of the motions of the earth before the time of Copernicus.

The men and institutions which have contributed to this result are
so few in number that it will not be tedious to mention at least the
principal actors. The possibility of measuring the motions of the stars
in the line of sight by means of the spectroscope was first pointed
out by Mr. now Sir William Huggins. He actually put the method into
operation. As soon as its feasibility was demonstrated it was taken up
at Greenwich. In these earlier attempts, eye methods alone were used,
and the results were not always reliable. Then spectrum photography
was applied at the astrophysical observatory at Potsdam by Vogel.
Thence the photographic method soon spread to Meudon and Pulkova.
But, as often happens when new fields of research are opened, we find
them ablaze in quarters where we should least expect. The successful
application of the method requires not only the best spectroscope, but
the most powerful telescope at command. Ten years ago the most powerful
telescope in the world was at the Lick Observatory. Mr. D. O. Mills put
at its eye end the best spectrograph that human art could make at that
time, the work of Brashear. It is Campbell, who, with this instrument,
has inaugurated a series of discoveries in the line in question which
are without a parallel.

A mere survey of what has been done in the various lines we have
mentioned would be far from giving an idea of the real significance of
the advance we are considering. Cataloguing the stars, estimating their
magnitudes, recording and comparing their spectra and determining
their motions, might be considered as, after all, barren of results
of the highest human interest. When we know the exact position of
every star in the heavens, the direction in which it is moving and the
character of its spectral lines, how much wiser are we?

What could hardly have been foreseen fifty years ago, is that these
various classes of results are now made to combine and converge upon
the greatest problem which the mind of man has ever attempted to
grasp--that of the structure of the universe. The study of variable
stars has suddenly fallen into line, so to speak, so that now, it is
uniting itself to the study of all the other subjects to give us at
least a faint conception of what the solution of this problem may be.

One of the principal objects of the present chapter is to make
a comparison of these various researches, and discuss the views
respecting the constitution of the stars individually, as well as of
the universe as a whole, to which they lead us. But there are a number
of details to be considered singly before we can combine results in
this way. Our early chapters will therefore be devoted to the special
features and individual problems of stellar astronomy which have
occupied the minds of astronomers from the beginning of their work to
the present time. Keeping these details in mind, we can profitably
proceed to the consideration of the general conclusions to be drawn
from them.

We may begin by refreshing our memories on some points, an
understanding of which must be taken for granted. What are familiarly
known as the heavenly bodies belong to two classes. Those nearest to us
form a sort of colony far removed from all the others, called the solar
system. The principal bodies of this system are the sun and eight great
planets with their moons, revolving round it. On one of the planets,
small when compared with the great bodies of the universe, but large to
our every-day conceptions, we dwell. The other planets appear to us as
stars. Four of them, Venus, Mars, Jupiter and Saturn, are distinguished
from the fixed stars by their superior brightness and characteristic
motions. Of the remaining three, Mercury will only rarely excite
notice, while Uranus and Neptune are as good as invisible to the naked
eye.

The dimensions of the solar system are vast when compared with any
terrestrial standard. A cannon shot going incessantly at its utmost
speed would be a thousand years in crossing the orbit of Neptune
from side to side. But vast as the dimensions are, they sink into
insignificance when compared with the distance of the stars. Outside
the solar system are spaces which, so far as we know, are absolutely
void, save here and there a comet or a meteor, until we look far
outside the region which a cannon shot would cross in a million of
years.

The nearest star is thousands of times farther away than the most
distant planet. Scattered at these inconceivable distances are the
bodies to which our attention is directed in the present work. If we
are asked what they are, we may reply that the stars are suns. But we
might equally well say that the sun is one of the stars; a small star,
indeed, surrounded by countless others, many of which are much larger
and brighter than itself. We shall treat our theme as far as possible
by what we may call the natural method, beginning with what, being most
obvious to the eye, was first noticed by man, or will be first noticed
by an observer, and tracing knowledge up step by step to its present
state.

Several features of the universe of stars will be evident at a glance.
One of these is the diversity of the apparent brightness, or, in
technical language, of the magnitudes of the stars. A few far outshine
the great mass of their companions. A greater number are of what we may
call medium brightness; there is a yet larger number of fainter ones,
and about one half of all those seen by a keen eye under favorable
conditions are so near the limit of visibility as to escape ordinary
notice. Moreover, those which we see are but an insignificant fraction
of the number revealed by the telescope. The more we increase our
optical power, the greater the number that come into view. How many
millions may exist in the heavens it is scarcely possible even to
guess. The photographic maps of the heavens now being made probably
show fifty millions, perhaps one hundred millions or more.

Another evident feature is the tendency of the brighter stars to
cluster into groups, known as constellations. The latter are extremely
irregular, so that it is impossible to decide where one constellation
should end and another begin, or to which constellation a certain star
may belong. Hence, we can neither define the constellations nor say
what is their number, and the division of the stars among them is a
somewhat arbitrary proceeding.

A third feature is the Milky Way or Galaxy, which, to ordinary vision,
appears as an irregular succession of cloud-like forms spanning the
heavens. We now know that these seeming clouds are really congeries of
stars too small to be individually visible to the naked eye. We shall
hereafter see that the stars of the Galaxy form, so to speak, the base
on which the universe appears to be constructed. Each of these three
features will be considered in its proper place.


II. MAGNITUDES OF THE STARS.

The apparent brightness of a star, as we see it from the earth, depends
upon two causes--its intrinsic brilliancy or the quantity of light
which it actually emits, and its distance from us. It follows that if
all the stars were of equal intrinsic brightness we could determine
their relative distances by measuring the respective amounts of light
which we receive from them. The quantity of light in such a case varies
inversely as the square of the distance. This will be made evident
by Fig. 1, where S represents the position of a star, regarded as a
luminous point, while A and B are screens placed at such a distance
that each will receive the same amount of light from the star. If the
screen B is twice as far as the screen A, its sides must be twice
as large as those of A in order that it shall receive all the light
that would fall on A. In this case its surface will be four times the
surface of A. It is then evident that any small portion of the surface
of B will receive one fourth as much light as an equal portion of
surface A. Thus an eye or a telescope in the position B will receive
from the star one fourth as much light as in the position A, and the
star will seem one fourth as bright.

[Illustration: FIGURE 1.]

The fact is, however, that the stars are very unequal in their actual
brightness, and in consequence the apparent magnitude of a star gives
us no clue to its distance. Among the nearer of the stars are some
scarcely, if at all, visible to the naked eye, while among the brighter
ones are several whose distances are immeasurably great. A remarkable
example is that of Caropes, the second brightest star in the heavens.

For these reasons astronomers are obliged to content themselves, in the
first place, with determinations of the actual amount of light that the
various stars send to us, or their apparent brilliancy, without regard
to their distance or actual brilliancy. The ancient astronomers divided
all the stars they could see into six classes, the number expressing
the apparent brightness being called the magnitude of the star. The
brightest ones, numbering in all about fourteen, were said to be of
the first magnitude. The fifty next in brightness were said to be of
the second magnitude. Three times as many, an order fainter, were of
the third magnitude. The progression was continued up to the sixth
magnitude, which included those which were barely visible.

As the stars are actually of every degree of apparent brilliancy, no
sharp line of demarkation could be drawn between those of one magnitude
and those of the magnitude next higher. Hence, different observers
made different estimates, some calling a star of the second magnitude
which others would call of the first, while others would designate a
star of the third magnitude which others would call of the second. It
is therefore impossible to state with absolute numerical precision what
number of stars should be regarded of one magnitude and what of another.

An idea of the magnitude of a star can be readily gained by the casual
observer. Looking at the heavens on almost any cloudless evening, we
may assume that the two, three or more brightest stars which we see are
of the first magnitude. As examples of those of the second magnitude,
may be taken the five brightest stars of the Dipper, the Pole Star and
the brighter stars of Cassiopeia. Some or all of these objects can
be seen on any clear night of the year in our latitude. Stars of the
third magnitude are so numerous that it is difficult to select any one
for comparison. The brightest star of the Pleiades is really of this
magnitude, but it does not appear so in consequence of the five other
stars by which it is surrounded. At a distance of 15 deg. from the Pole
Star, Beta Ursa Minoris is always visible, and may be distinguished by
being slightly redder than the Pole Star; it lies between two fainter
stars, the brighter of which is of the third and the other of the
fourth magnitude. The five readily visible but fainter stars of the
Pleiades are about of the fourth magnitude. Of the fifth magnitude are
the faintest stars which are easily visible to the naked eye, while the
sixth comprises those which are barely visible with good eyes.

Modern astronomers, while adhering to the general system which has
come down to them from ancient times, have sought to give it greater
definiteness. Careful study showed that the actual amount of light
corresponding to the different magnitudes varied nearly in geometrical
progression from one magnitude to another, a conclusion which accords
with the well-known psychological law that the intensity of sensation
varies by equal amounts when the exciting cause varies in geometrical
progression. It was found that an average star of the fifth magnitude
gave between two and three times as much light as an average one of
the sixth; one of the fourth gave between two and three times as much
light as one of the fifth; and so on to the second. In the case of
the first magnitude, the diversity is so great that it is scarcely
possible to fix an average ratio. Sirius, for example, is really six
times as bright as Altair, which is commonly taken as a standard for
a first magnitude star. To give precision to their estimates, modern
astronomers are gradually seeking to lay the subject of magnitudes on
an exact basis by defining a change of one unit in the magnitude as
corresponding to an increase of about two and one half times in the
amount of light.

If the practice of separating the visible stars into only six orders
of magnitude were continued without change, we should still have
the anomaly of including in one class stars of markedly different
degrees of brightness. Some more than twice as bright as others would
be designated of the same magnitude. Hence, to give quantitative
exactness to the results, a magnitude is regarded as a quantity which
may have any value whatever, and may be expressed by decimals--tenths
or even hundredths. Thus, we may have stars of magnitude 5.0, 5.1,
5.2, etc., or we may even subdivide yet farther and speak of stars
having magnitudes 5.11, 5.12, etc. Unfortunately, however, there
is as yet no way known of determining the amount of light received
from a star except by an estimate of its effect upon the eye. Two
stars are regarded as equal when they appear to the eye of equal
brilliancy. In such a case the judgment is very uncertain. Hence,
observers have endeavored to give greater precision to it by the use
of photometers,--instruments for measuring quantities of light. But
even with this instrument the observer must depend upon an estimated
equality of light as judged by the eye. The light from one star is
increased or diminished in a known proportion until it appears equal to
that of another star, which may be an artificial one produced by the
flame of a candle. The proportion of increase or diminution shows the
difference of magnitude between the two stars.

As we proceed to place the subject of photometric measures of star
light on this precise basis we find the problem to be a complex one.
In the first place not all the rays which come from a star are visible
to our eyes as light. But all the radiance, visible or invisible,
may be absorbed by a dark surface, and will then show its effect by
heating that surface. The most perfect measure of the radiance of a
star would therefore be the amount of heat which it conveys, because
this expresses what is going on in the body better than the amount of
visible light can do. But unfortunately the heating effect of the rays
from a star is far below what can be measured or even indicated by any
known instrument. We are therefore obliged to abandon any thought of
determining the total amount of radiation and confine ourselves to that
portion which we call light.

Here, when we aim at precision, we find that light, as we understand
it, is properly measured only by its effect on the optic nerve, and
there is no way of measuring this effect except by estimation. Thus,
all the photometer can do is to give us the means of increasing or
diminishing the light from one star, so that we can make it equal by
estimation to that from some other star or source of light.

The difficulty of reaching strict results in this way is increased by
the fact that stars are different in color. Two lights can be estimated
as equal with greater precision when they are of the same color than
when their colors are different. An additional source of uncertainty
is brought in by what is known as the Purkinje phenomenon, after the
physicist who first observed it. He found that if we took two lights of
equal apparent brightness, the one red and the other green, and then
increased or diminished them in the same proportion, they would no
longer appear equal. In other words, the geometrical axiom that halves
or quarters of equal quantities are themselves equal, does not apply to
the effect of light on the eye. If we diminish the two equal lights,
we find that the green will look brighter than the red. If we increase
them in the same proportion, the red will look brighter than the green.
In other words, the red light will, to our vision, increase or fade
away more rapidly with a given amount of change than the green light
will.

It is found in recent times that this law of change does not extend
progressively through all spectral colors. It is true that as we pass
from the red to the violet end of the spectrum the yellow fades away
less rapidly with a given diminution than does the red, and the green
still less rapidly than the yellow. But when we pass from the green to
the blue, it is said that the latter does not fade out quite so fast as
the green.

One obvious conclusion from all this is that two stars of different
colors which look equal to the naked eye will not look equal in the
telescope. The red or yellow star will look relatively brighter in a
telescope; the green or bluish one relatively brighter to the naked eye.

In recent times stars have been photographed on a large scale. Their
magnitudes can then be determined by the effect of the light on
the photographic plate, the impression of the star, as seen in a
microscope, being larger and more intense as the star is brighter.
But the magnitude thus determined is not proportional to the apparent
brightness as seen by the eye, because the photographic effect of
blue light is much greater than that of red light having the same
apparent brightness. In fact, the difference is so great that, with
the chemicals formerly used, red light was almost without photographic
effect. Even now, what we measure in taking the photograph of a star
is almost entirely the light in the more refrangible portions of the
spectrum. It appears, therefore, that when a blue and a yellow star,
equally bright to the naked eye, are photographed, the impression made
on the negative by the blue star will be greater than that made by the
yellow one. A distinction is therefore recognized between photographic
and visual magnitudes.

The photographic magnitudes of the stars are now being investigated and
catalogued on a scale even larger than that on which we have studied
the visual magnitudes. Yet we have to admit the non-correspondence
of the two systems. The bluer the star, the brighter will be its
photographic as compared with its visual magnitude. The most that can
be done is to bring about the best attainable agreement between the two
systems in the general average of all the stars.

Fortunately the differences between the colors of the stars are by
no means so great as those between the colors of natural objects
around us. All the stars radiate light of all colors; and although the
difference is quite appreciable either by the eye or by the photograph,
it is not so great as it would have been were the variations in color
as wide as in the case of terrestrial objects.

Two comprehensive surveys of the heavens, intended to determine as
accurately as possible the magnitudes of all the brighter stars, have
recently been undertaken. One of these is the Harvard photometry,
commenced by Professor Pickering at the Harvard Observatory, and
now extended to the Southern Hemisphere by the aid of a branch
establishment at Arequipa, Peru.

The instrument designed by Professor Pickering for his purpose is
termed a meridian photometer, and is so arranged that the observer
can see in the field of his telescope a reflected image of the Pole
Star, and, at the same time, the image of some other star while it is
passing the meridian. By a polarizing apparatus the image of the star
to be measured is made to appear of equal brightness with that of the
Pole Star, and the position of a Nicol prism, which brings out this
equality, shows the ratio between the magnitudes of the two stars.

The other survey, with the same object, is now being made at the
Potsdam Astrophysical Observatory, near Berlin. In the photometer
used by the German astronomers the image of one star is compared
with an artificial star formed by the flame of a candle. The work is
performed in a more elaborate way than at the Harvard Observatory,
and in consequence, only that part of the heavens, extending from the
equator to 40 deg. north declination, has been completed and published.
A comparison of the results thus obtained with those of Professor
Pickering, shows a curious difference depending on the color of the
star. In the case of the reddest stars, the estimates are found to be
in fairly close agreement, Pickering's being a little the fainter.
But in the case of the white or bluish stars, the estimates of the
German astronomers are more than one fourth of a magnitude greater
than those of Pickering. This corresponds to an increase of nearly one
fifth in the brightness. Whether this difference is to be regarded as
purely psychological or due to the instruments used, is an interesting
question which has not yet been settled. It is difficult to conceive
how different instruments should give results so different. On the
other hand, the comparisons made by the Germans make it difficult to
accept the view that the difference is due purely to the personality
of the observers. There are two German observers, Drs. Muller and
Kempf, whose results agree with each other exactly. On the other hand,
Pritchard, at Oxford, made quite an extensive photometric survey,
using an instrument by which the light of one star was cut down by
a wedge-shaped dark glass, whereby any gradation of light could be
produced. A comparison shows that the results of Pritchard agree
substantially with those of Pickering. It is quite possible that the
Purkinje phenomenon may be the cause of the difference, the source of
which is eminently worthy of investigation.

This fact simply emphasizes the lack of mathematical precision in
photometric measurements of star light. Even apart from this difference
of color, the estimates of two observers will frequently differ by 0.2
and sometimes by even 0.3 of a magnitude. These differences correspond
roughly to 20 or 30 per cent in the amount of light.

It must not be supposed from this that such estimates are of no value
for scientific purposes. Very important conclusions, based on great
numbers of stars, may be drawn even from these uncertain quantities.
Yet, it can hardly be doubted that if the light of a star could be
measured from time to time to its thousandth part, conclusions of yet
greater value and interest might be drawn from the measures.

We have said that in our modern system the aim has been to so designate
the magnitudes of the stars that a series of magnitudes in arithmetical
progression shall correspond to quantities of light ranging in
geometrical progression. We have also said that a change of one unit
of magnitude corresponds to a multiplication or division of the light
by about 2.5. On any scale of magnitude this factor of multiplication
constitutes the light-ratio of the scale. In recent times, after much
discussion of the subject and many comparisons of photometric measures
with estimates made in the old-fashioned way, there is a general
agreement among observers to fix the light ratio at the number whose
logarithm is 0.4. This is such that an increase of five units in the
number expressing the magnitude corresponds to a division of the light
by 100. If, for example, we take a standard star of magnitude one and
another of magnitude six, the first would be 100 times as bright as the
second. This corresponds to a light ratio slightly greater than 2.5.

When this scale is adopted, the series of magnitudes may extend
indefinitely in both directions so that to every apparent brightness
there will be a certain magnitude. For example, if we assign the
magnitude 1.0 to a certain star, taken as a standard, which would
formerly have been called a star of the first magnitude, then a star a
little more than 2.5 times as bright would be of magnitude one less in
number, that is, of magnitude 0. The one next brighter in the series
would be of magnitude -1. So great is the diversity in the brightness
of the stars formerly called of the first magnitude that Sirius is
still brighter than the imaginary star just mentioned, the number
expressing its magnitude being -1.4.

This suggests what we may regard as one of the capital questions in
celestial photometry. There being no limit to the extent of the scale,
what would be the stellar magnitude of the sun as we see it when
expressed this way on the photometric scale? Such a number is readily
derivable when we know the ratio between the light of the sun and that
of a star of known magnitude. Many attempts have been made by observers
to obtain this ratio; but the problem is one of great difficulty, and
the results have been extremely discordant. Amongst them there are
three which seem less liable to error than others; those of Wollaston,
Bond and Zollner. Their results for the stellar magnitude of the sun
are as follow:

  Wollaston      -26.6
  Bond           -25.8
  Zollner        -26.6

Of these, Zollner's seems to be the best, and may, therefore, in taking
the mean, be entitled to double weight. The result will then be:

  Stellar magnitude of sun       -26.4

From this number may be readily computed the ratio of sunlight to that
of a star of any given magnitude. We thus find:

The sun gives us:

     10,000,000,000, the light of Sirius.
     91,000,000,000, the light of a star of magnitude 1.
  9,100,000,000,000, the light of one of magnitude 6.

The square roots of these numbers show the number of times we should
increase the actual distance of the sun in order that it might shine
as a star of the corresponding magnitude. These numbers and the
corresponding parallax are as follows:

  Sirius; Distance =   100,000: Parallax = 2".06
  Mag. 1     "         302,000:    "       0".68
   "   2     "         479,000:    "       0".43
   "   3     "         759,000:    "       0".27
   "   4     "       1,202,000:    "       0".17
   "   5     "       1,906,000:    "       0".11
   "   6     "       3,020,000:    "       0".07

These parallaxes are those that the sun would have if placed at such a
distance as to shine with the brightness indicated in the first column.
They are generally larger than those of stars of the corresponding
magnitudes, from which we conclude that the sun is smaller than the
brighter of the stars.




PREVENTIVE INOCULATION. (II.)

BY DR. W. M. HAFFKINE,

DIRECTOR-IN-CHIEF, GOVERNMENT PLAGUE RESEARCH LABORATORY, BOMBAY.


In a previous paper I reviewed briefly the history of preventive
inoculation and described the results of my attempts to secure a 'virus
fixe' in the case of cholera. It will be remembered that the two
vaccines finally obtained protected guinea pigs successfully against
all possible forms of cholera infection.

It was now necessary to ascertain whether the same protection could
be given to man which was observed in animals. For this purpose it
was essential to first of all prove the perfect harmlessness of the
operation. This was established by very careful observations of medical
men and scientists who were inoculated in Europe soon after the results
of the above investigations were published. The inoculation causes a
rise of temperature and general discomfort, which lasts one or two
days, and some pain at the seat of the injection, which disappears
in a few days. The fever and discomfort induced are, on the whole,
shorter in duration, though often more intense, than those caused by
vaccination against smallpox. The effect disappears within a few days
and the individual returns to his usual condition of health.

The next and all-important stage was to devise an experiment or a
series of experiments on man so as to test the efficiency of the method
against cholera attacks. This part of the investigation could only be
done in a cholera-stricken country, where opportunities would arise of
comparing the incidence of the disease in inoculated and uninoculated.
Such opportunities are limited. Except in certain parts of India
and China, cholera appears in localities unexpectedly and does not
last long. In the places where the disease is endemic the cases are
scattered over large areas. These features rendered the demonstration
of the effect of the vaccine a matter of particular difficulty. In
1893 I went to India, and in the course of a year inoculated some
twenty-three thousand people in the northern parts of the country;
but no cholera appeared in their midst to show whether the vaccine
was of value or not. In the spring of 1894 the inoculations were
introduced into Bengal, and, with the assistance and co-operation of
Prof. W. J. Simpson, of King's College, London, at that time Health
Officer of Calcutta, and of his staff, efforts were made to induce the
inhabitants of the _bustees_ of Calcutta to get themselves inoculated.
These bustees are isolated villages consisting of groups of mud huts
inhabited by the poorer class. Owing to the consumption of water from
the ponds or tanks belonging to these villages, the inhabitants of the
bustees are subject to periodic visitations of cholera. It was in one
of these bustees that the first observation was made as to the effect
of the cholera vaccines.

The spring is essentially the cholera season in Calcutta. About the end
of March two fatal cases of cholera and two cases of choleraic diarrhoea
occurred in Katal Bagan Bustee, in a population grouped around two
tanks. This outbreak led to the inoculation of one hundred and sixteen
persons in the bustee out of about two hundred. After the inoculation
there occurred nine more cases of cholera, seven of which proved fatal,
and one case of choleraic diarrhoea. All the ten cases occurred among
the uninoculated portion of the inhabitants, which formed the minority,
none of the inoculated suffering. The results were more interesting
when analyzed in detail. Some of the cases had occurred in families in
which some of the members had been inoculated and others not, and the
disease selected the non-inoculated members, sparing the inoculated.
Thus, in one house six members out of eight had been inoculated. The
attack, a fatal one, occurred in one of the remaining two. In another
house eleven members out of eighteen were inoculated. The eleven
members remained free while four out of seven not inoculated were
attacked.

Upon these observations the Calcutta municipality felt encouraged to
vote funds for the continuance of the inoculations in an experimental
farm, and appointed for that purpose a special staff. In 1896 the
result of two years' observations were embodied by the health officer
in a report to the Calcutta Municipal Corporation. It recorded a most
satisfactory state of affairs. During the time under observation some
eight thousand persons were inoculated. Cases of cholera occurred
in seventy-seven huts in which some members of the family had been
previously inoculated and others not. Comparing the incidence of the
disease in the two groups, a striking advantage was found to be with
the inoculated. I made an analysis of the cases according to the time
which had elapsed between inoculation in each of these huts and the
occurrence of cholera in them, and the following results were found.
During the first four days after inoculation, apparently before
the vaccine had time to produce its full protective effect, there
were proportionately 1.86 times fewer deaths among the inoculated
than among the non-inoculated members of the families. In a second
period, extending from the fifth to the four hundred and twenty-ninth
day--i. e., for fourteen months--there were 22.62 times fewer deaths
among the inoculated; while in the last period--that is, between the
four hundred and thirtieth and seven hundred and twenty-eighth day
after the inoculation--there were only 1.54 fewer deaths among the
inoculated, the immunity having evidently gradually disappeared. The
net result was that for two years after inoculation, including the
periods of incomplete protection, there was a reduction in mortality
of 72.47 per cent among the inoculated; or in other words, in houses
in which inoculations were performed and in which cholera subsequently
occurred there were, even from the day of inoculation, before the full
effect of it could be produced, eleven deaths among the non-inoculated
to only three among the inoculated. Eight lives out of every eleven
were saved.

At the end of my first cholera campaign, in August, 1895, there were
altogether 31,056 natives of India, 125 Eurasians, 869 Europeans of the
civil population, 6,627 native officers and sepoys, and 294 officers
with 3,206 men of the British troops stationed in India, in all 41,787
people, who had submitted to inoculation. Observations instituted among
them, especially among prisoners, soldiers and coolies in tea estates,
with regard to whom detailed records could be kept, went to confirm
the results as detailed above. In order to lengthen, if possible,
the period of immunity, the plan was formed of inoculating stronger
vaccines and in higher doses. The inoculations are now carried on in
a Government laboratory, in Purulia, Bengal, chiefly among the people
emigrating to the cholera districts of Assam, and there is no doubt
that in the course of time a marked effect upon the prevalence of
cholera in those districts will be produced and valuable theoretical
data will be obtained.

       *       *       *       *       *

There was one noticeable feature about the results of the inoculation
against cholera which early attracted my attention, and this was that
while the number of attacks and the absolute number of deaths was
strikingly influenced by the operation, the proportion of deaths to
those attacked did not appear to be changed. The case incidence was
effectively checked, but the 'case mortality' was not reduced. The
inoculation diminished the chances of an attack of cholera--that is,
the chances of the cholera virus penetrating into the tissues of a
man; but if it so happened that the patient was attacked and the virus
found an entrance and started growing in the system notwithstanding the
inoculation, the latter would not assist in mitigating the severity of
the symptoms or reducing the fatality of the disease. In analyzing this
result further, it seemed to me permissible to assume that the vaccine
protected against the cholera microbes themselves, but did not protect
against their poisonous products, which are the cause of the actual
symptoms.

This interpretation of the facts found support in a set of laboratory
experiments by Professor Pfeiffer and Dr. Kolle, of Koch's Institute,
in Berlin, who showed that the blood serum of animals and persons
inoculated with the cholera vaccine, as practiced in India, acquired
an intense power of destroying cholera microbes, but exhibited
no properties capable of counteracting the effect of their toxic
products--no 'antitoxic properties'. Combined with those of previous
experimenters these results tended to prove that two kinds of immunity
could be produced separately, and it became incumbent to devise a
plan which would secure not only a lowering of susceptibility to the
disease, but also a reduction in the case mortality.

For that purpose it seemed rational to attempt the treatment with a
vaccine containing a combination of bodies of microbes, together with
their toxic products. I intended to test this plan experimentally in
the cholera districts; but, plague having broken out in Bombay, the
Government of India commissioned me to inquire into the bacteriology of
that disease, and I determined that the knowledge gained in the cholera
inoculations should be applied and tested in the preparation of a
prophylactic against the new epidemic.

The experiments I had in view involved manufacturing a material on a
large scale, and operating on it for weeks continuously. To do this
it was essential to find a way of recognizing plague growth with
certainty, so as to enable the officers engaged in the manufacture
to control the process and know exactly when they were handling the
proper stuff, and when an admixture and invasion of extraneous growth
took place. When this was solved, a drug was prepared by cultivating
the plague microbe in sterilized broth, to which a small quantity
of clarified butter or of cocoanut oil had been added. The plague
bacilli attach themselves to the drops of butter or oil floating on the
surface, and grow down into the depth of the liquid, forming a peculiar
threadlike appearance. While doing so they secrete toxic matter, which
is gradually accumulated in the liquid; at the same time a large amount
of microbial growth comes gradually down from the surface of the liquid
and collects at the bottom of the flask. When shaken up the whole
represents the desired combination of the bodies of microbes and of
their toxic products. The process is continued for a period of five
to six weeks. As the microbes of plague had been very little studied
before, and as their exact effect on the human system was unknown,
I decided not to use for the treatment living microbes, but to use
at least at first 'carbolized' vaccines, though the result of the
treatment might be less favorable or less lasting than that which could
be expected from living vaccines. The microbes in the above plague
growth were accordingly killed by heating them at a temperature ranging
from 65 deg. to 70 deg. C., and then mixed with a small proportion of
carbolic acid, to prevent the drug from subsequent contamination and
decomposition. The dose of the prophylactic was regulated by measuring
up the quantity to be injected. The requisite amount is determined by
the degree of fever which it produces. The febrile reaction varies in
different individuals, but a temperature reaching 102 deg. and above in
at least thirty per cent of those inoculated has been found to indicate
a good material. In the cholera, rabies and smallpox vaccines, the
microbes being employed in a living state, it was essential to fix the
strength of the vaccine, for otherwise it was impossible to predict the
behavior of the microbe when injected into the system. In the case of
the plague prophylactic the activity of the microbes is arrested before
it is inoculated, and the effect can be regulated, as mentioned above,
by simply measuring up the doses in the same way as is done with any
chemical drug.

The expectation formed when devising the plan for the plague
prophylactic has been very fortunately justified, and an advance on the
results from the cholera vaccines was obtained; but I can not yet say
certainly whether this favorable result is indeed due to the particular
provisions which I had made for obtaining it.

The effect of the plague prophylactic was first tested at the Byculla
Jail, in Bombay, when the epidemic reached that establishment. From
the first day after the inoculation till the end of the outbreak there
were in the jail twelve cases and six deaths among one hundred and
seventy-two uninoculated inmates, and two cases, with no deaths, among
one hundred and forty-seven inoculated. A year later, almost exactly
a similar result was observed when the plague attacked the so-called
Umarkhadi Common Jail, in Bombay. In this case after the inoculation
there were ten cases and six deaths among one hundred and twenty-seven
uninoculated inmates, and three cases, with no deaths, among one
hundred and forty-seven inoculated. These and other observations show
that the vaccine for the plague begins to exercise its effect within
some twenty-four hours after inoculation; that it is useful even in
the case of persons already infected; that it is therefore applicable
at any stage of an epidemic. Numerous further observations were soon
collected on the working of the system.

At the small village of Uudhera, of the Baroda feudatory state, where
plague broke out, inoculation was applied to a half of each family, the
other half remaining uninoculated. After that there were twenty-seven
cases and twenty-six deaths among sixty-four uninoculated, and eight
cases, with three deaths, among seventy-one inoculated of the same
households, the proportionate difference in mortality being over
eighty-nine per cent. There followed observations on a far larger
scale, demonstrating that the mortality of the inoculated, compared
to that of the non-inoculated, was on an average between eighty and
ninety per cent less. Sometimes this reduction reached ninety per cent.
In the Punjaub, in a village called Bunga, there occurred, in two
hundred and eighty-one not inoculated, ninety-seven cases of plague and
sixty-five deaths, while among seventy-four inoculated there were six
cases, but no deaths. In Bangalore, among 80,285 of the inhabitants not
inoculated, there were 2,208 deaths from plague, while among 23,537
inoculated there were only 108. The observations at Lanowli, Kirkee,
Daman, Hubli, Dharwar, Gadag, in the Bombay Presidency, gave the same
results. At Hubli over forty-two thousand inhabitants out of some
fifty thousand were inoculated. In Bombay city, out of a population
of 821,764, 157,256 have now undergone the inoculation. The work
proceeds here at present at the rate of one thousand to eleven hundred
inoculations a day.

From plague hospitals the returns show that among those of the attacked
who were previously inoculated the mortality is reduced to less than
one half of that among patients who were not inoculated. The property
of reducing the case mortality thus appears to belong to the plague
prophylactic in an unmistakable degree.

       *       *       *       *       *

By the anti-cholera and anti-plague inoculation the methods of
preventive treatment by means of cultivated bacteria and their products
have been rendered, so to say, a part of the daily policy in human
medicine. The usefulness and practicability of those methods have
become clearly apparent, and steps have been taken to extend further
the field of their application. On the ground of the experiments
made with the typhoid bacillus in the Pasteur Institute in 1889-'93,
and of the results obtained from the anti-cholera inoculation in
India, I was able to induce Professor Wright, of the Pathological
Laboratory in Netley, whom I initiated in 1892 in the principles and
technique of anti-cholera inoculation, to start a campaign of similar
operations against typhoid among the British troops. The latter are
stationed at different times of their service very nearly in all parts
of the world, and yearly pay a very heavy tribute to that disease.
The medical officers in charge of these troops pass through a course
of training at Netley, and Professor Wright had rendered excellent
services in connection with the cholera inoculations, by disseminating
the knowledge of them among the probationers of the school. It seemed
to me expedient, therefore, to start the typhoid inoculation also
through the staff and pupils of that school. The following plan as
to the preparation of the vaccine, and the way of carrying out the
inoculation, was laid before Professor Wright. The typhoid bacillus
was to be brought to a fixed stage of virulence by the inoculation in
the peritoneal cavity of Guinea pigs, according to the exact rules
prescribed for the anti-cholera inoculation. Once the virus was fixed,
it was to be cultivated for twenty-four hours on a solid medium, and
a first vaccine prepared by carbolizing that virus. As, however, the
durability of the effect of carbolized vaccine alone was not known,
this was to be followed up by the injection of a dose of the fixed
living virus.

The inoculation was first to be made on volunteers among the physicians
on probation at Netley; then on volunteers among the young officers of
the army on the eve of their departure for the tropics; and then, with
the approval of the military authorities, on volunteers among private
soldiers. At the end of 1895, during my visit to England, I obtained
from Sir William Mackinnon, then Director-General of the Army Medical
Department, permission for Professor Wright to start the work upon the
plan above detailed; and the first inoculations, in the way described
above, were done in the middle of 1896. Soon after that, Pfeiffer
and Kolle, recognizing the same similarity between the cholera and
typhoid microbes, and pointing out that the results obtained by us in
India were likely to be repeated when applying the method to typhoid,
proposed and started a similar series of inoculations.

When the inoculation against plague was begun, and observation showed
that dead vaccines alone were apparently sufficient to produce
satisfactory results, a second inoculation with living virus appeared
less urgently necessary; and as the effect of such an inoculation,
which Professor Wright very courageously tried first on himself,
seemed troublesome, it was decided to do for the time being the second
inoculation also with the carbolized virus. Similarly, the plan which
was adopted for the plague inoculation, of cultivating the vaccine
in a liquid, instead of a solid medium, and of using cultures of
several weeks' duration, has been subsequently adopted in the typhoid
inoculation also.

Many thousands of British soldiers and civilians have already undergone
the inoculation in question. The latter was done partly with vaccines
cultivated on a solid medium, according to the older plan, and
partly with vaccines prepared according to the plague inoculation
method. The results so far observed are encouraging, and, I hope,
will shortly be improved considerably. At the last Harveian dinner in
London, Surgeon-General Jameson, Director-General of the Army Medical
Department, summarized the results of the observations in India, where,
among several thousands of young soldiers, the most prone to the
disease, the incidence of typhoid since their inoculation was 0.7 per
mille, while among the older, more resistant, not inoculated soldiers,
the incidence was during the same period just double that. A large
proportion of the force now on service in the South African campaign
have been inoculated, some before embarking and others on their way out.

       *       *       *       *       *

Such is the position of preventive inoculation, as applied, so far, to
human communities. The very success of these operations is now apt to
create some sort of feigned or earnest alarm, and one meets at present
with the question, What is going to happen to our poor body if we
are to be inoculated against _all_ diseases? and with this other one,
How do you expect us to make a _living_ if you try to keep all of us
alive? The humorous form of these questions usually permits of their
dropping out of the conversation without a reply. The earnest answers
are, however, obvious. The efforts of the bacteriologists in combating
diseases are at present directed to a twofold aim: their prevention, by
a prophylactic treatment, and their cure. The advantage of a curative
treatment is that it is to be applied to a relatively small number of
persons, to those who actually fall victims to an attack; while that
of the preventive treatment is in the greater certainty with which
safety and protection are secured by it. The relative position of the
two treatments will, in practice, differ in different diseases--namely,
according to the prevalence and fatality of a given disease, and
according to the merits of the two treatments as they stand at the
time. In diseases in which the risks of being attacked are smaller,
or the consequences of an attack less serious, or for which a very
effective and sure curative treatment has been discovered, the majority
of people will prefer to wait for an actual attack rather than to
undergo the discomfort of a preventive treatment; in diseases, on the
contrary, in which the chances of being attacked are great, or in which
the fatality is higher, the sequelae of an attack more serious, and for
which a successful and not very troublesome preventive treatment has
been found, large numbers will undergo preventive inoculation. But,
even in the latter case, a mutual co-operation between the two methods
will exist always, as there will always be a number of people, either
among those who have neglected to protect themselves by inoculation,
or among those in whom the inoculation has proved unsuccessful, who
will fall victims to an attack and require the benefits of a curative
treatment, be those at the time little or great.

The answer to the second question is of course to be expected rather
from the politico-economist, the wise administrator, the civilian, than
from the bacteriologist. In any case it is clear already that if we
are ever to be told that we must thin our ranks, we shall prefer not
to leave the task in the hands of the indiscriminating microbe, but to
have some voice in the matter ourselves. Inoculation marks only the
conquest of another force which henceforth we shall be glad to control.

    BOMBAY, INDIA, _March, 1900_.




COLONIES AND THE MOTHER COUNTRY. (II.)

BY JAMES COLLIER.


The growth of the relations between a colony and the mother country
closely follows the development of the relationship between an
organism and its offspring, or (in higher species) between parents and
children. When an infusorian subdivides into two cells, the new cell
produced swims away and henceforth leads an independent life. Most
of the Phoenician and most of the earlier Greek colonies were social
infusoria which parted from the parent organism by segmentation and
had no further relations with it. As we rise in the animal scale a
new relationship, that between mother and young, and a new instinct,
the maternal, come into existence. These begin as low down as the
mollusks, and expand and heighten, though not without strange lapses,
in both insects and birds as species develope; but we need not trace
the evolution here. Let it suffice to note that there are successive
degrees of specialization; a site is chosen suitable for depositing and
hatching eggs; means are found for making them secure; a shelter is
built for them; they are deposited near substances adapted to nourish
the young; special food is prepared for them; they are reared through
food disgorged or brought to them. The accession of the male to the
family marks the dawn of the paternal instinct; it appears earliest
among fishes. This evolution is repeated in the history of colonies,
where, however, the maternal and paternal offices melt into one another
insensibly.

The mother country founds and nurtures colonies. Most of the earliest
colonies are the work of adventurous bands or navigating merchants
or fishermen, who seek their own habitats, carry with them their own
equipment and fight their own battles. Then the metropolis settles its
surplus or discontented citizens in territories previously chosen,
provides them with all that is necessary for their start, and often
nourishes them during the infancy of the colony. Hispaniola was a state
colony manned with miners and artisans who were provided with tools,
and this at the cost of a loan and a draught from the confiscated
property of the Jews. Nor was it until gold began to be found in large
quantities that the receipts equalled the expenditure on the young
colony. Louisiana was founded and fostered with a royal munificence
that conferred on it "more than was contributed by all the English
monarchs together for the twelve English colonies on the Atlantic."
Georgia was a one-man foundation, but the British Parliament twice
granted considerable sums to initiate it and carry it on; the Society
for the Propagation of the Gospel aided, and the benevolence of
philanthropic England contributed largely to its success. Not till
1818--more than half a century after the conquest--did the revenue
of Canada balance its expenditure. The convict colony of New South
Wales was, of course, entirely of state origin. Stores of every kind,
together with cattle and seeds, were sent out at the beginning, and
long continued to be sent out to it. The first governor was granted
a space of two years to make it self-supporting, but the growth of
a convict colony is abnormally slow, and the civil and military
establishments for thirty-four years continued to be a drain on the
British exchequer to the extent of over ten millions. Even now one of
the oldest and best of existing British colonies, with an area of over
three hundred thousand square miles, does not produce the breadstuffs
needed for its own consumption. The Cape of Good Hope, of mixed Dutch
and French origin, was first made a truly British colony by the
dispatch of six thousand emigrants at the cost of the mother country--a
cost much greater than was anticipated. When the Transvaal was forcibly
annexed by England, the stepmother country advanced a sum of L90,000
to rescue the quondam republic from its financial difficulties. In
1895 Parliament voted three millions for the building of a railroad in
British East Africa. Uganda is supported by a British subsidy. Algeria
is a manufactured colony, which has all along had to be supported
by its creator. Apart from the cost of their civil and military
establishments, France has to subsidize her colonies to the extent of
over four millions sterling, partially expended in reproductive public
works. Even tiny New Caledonia costs France half a million, one half of
which, it is true, is expended on the convict establishment.

Most colonies at their beginning are burdensome to the mother country.
Years after its foundation South Australia fell into such embarrassment
that its governors had to draw on the imperial exchequer for nearly a
million. In 1834 the expenditure in Cape Colony was still in excess of
the revenue. Sierra Leone had to be aided by a parliamentary grant year
after year. No wonder the Colonial Office complained that colonies were
expensive to keep up. In German Africa the revenue does not meet the
expenditure. The Congo Free State does not pay its way. On the other
hand, Congo Francaise has a substantial surplus. Western Australia was
another exception to the rule. There the Imperial Government announced
that it would contribute nothing to the foundation of the colony,
which was to be self-supporting from the first. Private capitalists
were to arrange for the emigration of ten thousand persons in four
years. Lands were granted to the emigrants on a scale of extravagance
which long hampered the progress of the colony. Companies likewise
expend large sums in many colonies. French and English companies
embarked on American, Indian, African and island adventures at ruinous
loss. Law's company withdrew from Louisiana, the New Zealand Company
from New Zealand, and the Canterbury Association from Canterbury
with a balance on the wrong side of the account. Wealthy individuals
bear their part. Mr. Rhodes annually subsidizes the British Central
African Protectorate, and King Leopold the Congo Free State. Colonial
bishoprics have also been endowed and colonial cathedrals built,
largely with the aid of voluntary contributions by sympathizers in the
mother country.

The mother state sometimes gives the colonies the benefit of her
financial good name. In 1869 England withdrew her regiments from
New Zealand when the colony was still at war with the Maoris, and
to salve the wounded feelings of the colonists she agreed (under
pressure) to guarantee a loan of a million in aid of emigration and
public works. Before the Canadian Pacific Railway could be completed
the Imperial Government had to guarantee a loan of L3,600,000. Mr.
Rhodes proposes (unsuccessfully, it now appears) that the Imperial
Government, which contributed L200,000 to the cost of a railway from
Kimberley to Buluwayo, should guarantee a loan of an enormous amount
for the continuation of the African trunk railway from Buluwayo to Lake
Tanganyika.

The mother country supports or aids its self-governing colonies through
its capitalists. In order to execute public works--roads, bridges and
railways--to assist immigration, to build fortresses, and sometimes
to pay the interest on previous loans, all the colonies have habitual
recourse to the British Stock Exchange. There are good reasons for
this. The colonies have little capital of their own, for all their
money has been used up from day to day. The English investor has
an almost unlimited amount--the savings mainly of one industrious
century--and he is prepared to lend it at a lower rate of interest than
would content the colonial capitalist. Of over two thousand millions
sterling which John Bull has out at usury all over the world, the total
public and private indebtedness of the seven Australasian colonies
alone, with a population of four millions, is stated to exceed three
hundred and twenty millions, or at the rate of eighty pounds per head
of these daring colonists. One half of this sum is due from colonial
governments for the purposes already named. The half of it, due from
banks, building companies, mercantile associations and mortgage
agencies, excites no misgivings; these institutions can always go
bankrupt, as many of them did in the financial collapse of 1891-'93.
But it is not open to a British colony to file its schedules, or at
least so we used to think; and so the Times said till the oldest of
British colonies went bankrupt the other day. At all events, it is
harder, and we contemplate this enormous pile of public indebtedness
in young and scantily peopled communities with the same feelings as
made alarmists foresee impending ruin in the growing augmentation
of the gigantic public debt of the United Kingdom. It is commonly
said that while the imperial debt has been accumulated as the cost
of "just and necessary wars," or of wars that were neither just nor
necessary, the colonial debt has been contracted for the execution of
reproductive public works. This is not altogether so. Eleven million
pounds of the public debt of New Zealand were contracted to carry on
war with the Maoris, who were defending their territory. The Seven
Years' War, which was begun on the part of England to gain possession
of the Ohio Valley and thus increase the extent of her colonies,
doubled her public debt. Where is the difference between the two
classes of expenditure? Then most of the self-governing colonies have
expended large sums in fortifying ports, some in partly supporting
a fleet, and one at least in purchasing war ships of its own. Nor
has all the remainder been reproductively expended. The building of
schools is a wise way of spending money, one's own or another's, but
it can not be called a materially reproductive way. Governors' and
ministerial residences, parliamentary and departmental buildings, are
indispensable, but they can not be called 'assets,' especially if built
of perishable and inflammable timber. Even railways, most profitable of
public works, are not always true assets. In many of the colonies they
are light railways, and when traffic increases and a higher speed is
required they will have to be built over again and new rolling stock
procured. Not a few of them, too, are 'political railways,' running
through a sparsely populated country no-whither, and built to capture
votes. Roads are only less valuable, but they were made (sometimes by
graduates and men of scientific antecedents who were afterward cabinet
ministers) at the wage rate of from two guineas to four pounds ten per
week, and are an inadequate return on the outlay. Last century British
loans were issued as prizes to friends of ministers, and a much reduced
amount found its way to the treasury. Deduct an analogous, though
not quite similar, item of waste in colonial loans, add this to all
the other non-reproductive elements, and the genuinely reproductive
proportion will shrink considerably. Every one of the colonies, even
with the fee simple of territories only less than Europe in extent in
their hands, would have sunk under the increasing burden. Happily or
not, the ever-growing wealth of England has so cheapened money that the
interest charge on the whole Australasian indebtedness sank in five
years (1890-'96), mainly through conversion of loans, from fourteen
millions to twelve and a quarter. It may be added that the colonies
which have borrowed most recklessly have not been the most populous or
those with largest resources, but rather the socialistic colonies with
big schemes on hand.

A father may assist his son by supplying him with the capital needed to
carry on his business. Thus it is entirely with the mother country's
money that the first colonial banks are founded. As the colony grows
wealthier and the business of the banks extends, colonial shareholders
purchase stock in it, but the number of British shareholders remains
considerable. A typical example is that of the Bank of New Zealand,
from two fifths to one half of whose shares are (or in 1888 were)
held in the United Kingdom. In the older or wealthier colonies of New
South Wales and Victoria the number of English shareholders may be
smaller, though still large. A still larger proportion of the shares
of the great colonial steamship companies, amounting possibly to three
fourths or nine tenths of the whole, is held (chiefly by commercial
men and firms) in Great Britain. Many commercial undertakings in all
the colonies are engineered entirely by English capital (not included
in the two thousand millions). The Canadian transcontinental railway;
railways, electric tramway lines and silver mines in Tasmania; the
Midland Railway and also copper mines in New Zealand; the gold mines
in Western Australia to such an extent that much more English capital
is said to pour into that colony than gold flows out of it--are only
a few colonial enterprises that would never have been undertaken but
for the mother country's aid. Some of these are lucrative, others
not; some have been abandoned, and others belong to a still darker
class. "Uncounted millions of capital have been raised in the central
money market of London, only to be fooled away in ill-conceived and
misdirected enterprises abroad," says Lord Brassey. Nor are the losses
confined to questionable undertakings. Two great Australasian banks
have frittered away their entire capital of four and three millions,
respectively, and it may be assumed that the British investor has
borne one half of the losses. Of half a dozen smaller colonial banks
a similar tale might be told. Father and son have to share in one
another's adversity, as in one another's prosperity.

The socialistic movement in England has lately so strongly reacted on
the relations of the Imperial Government with the colonies that the
Secretary of State is believed to be willing to employ the resources
of the empire to assist backward colonies. He has invited English
capitalists to aid the declining West Indies, and a leading firm has
offered to invest a million in the sugar industry if a guarantee
of sufficient returns is given. The constitution of the projected
Australian Federation contains a novel analogous provision, permitting
the commonwealth to aid its needy provinces. The growing unity in the
social organism as a whole is accompanied by an increasing unity in its
component parts.

The mother country continues to defend its colonies, as animals defend
their young and parents their children. But the polyp does not defend
its offspring, nor did the earliest colonizing powers succor their
colonies. While not even the armed persuasion of Cambyses could induce
Tyre to make war against Carthage, neither seems to have helped the
other in its need. Carthage fought savagely for her Sicilian colonies,
but in her own interests, not in theirs. Though the ties between a
Greek metropolis and her colonies were closer, the one did not
invariably defend the other. Corcyra refused the aid her daughter city
Epidaurus sought, and the latter had to find it in the grandmother city
of Corinth, who considered it _her_ colony no less than that of Corcyra.
The Dorian city was celebrated for her typical Greek patriotism, and
she gladly assisted Syracuse to expel her Carthaginian conquerors. Rome
fought for her colonies while her power lasted. France and England
fought for their colonies, or rather for the possession of them, all
through the eighteenth century. Spain has just fought for her last
colonies, but as much against the colonists as against the foreign
state that came to set them free. The mother country is also at the
cost of keeping her colonies in a state of defence. The sum of L9,000
was in 1679 annually expended on the maintenance of English soldiers in
Virginia and two West Indian colonies, and L1,000 on the fortifications
of New York. Troops were often dispatched to assist the American
colonies in special expeditions. The colonial military expenditure of
Great Britain in 1859 amounted to nearly L1,200,000. In compliance
with the findings of a Royal Commission, repeatedly reaffirmed by
resolutions of Parliament, to the effect that the self-governing
colonies ought to suffice for their own military defense, the troops
were finally withdrawn in 1873, but she still maintains a garrison at
Halifax and in Natal and a fleet in Australian waters, to which last
the adjacent colonies contribute a fraction. Most of the self-governing
colonies have at their own cost erected fortresses, and they maintain
a defensive force. Two of them have stationary ships of war. They are
willing and eager, moreover, to aid the mother country when she is in
difficulties. When England was embroiled in Egypt or danger threatened
in India and South Africa, several of these colonies offered to send,
and one actually sent, troops to engage in wars in which they were
not directly concerned. The head and the extremities are sometimes at
variance because their interests conflict. The heart of such an empire
is one. A stride has been taken toward organic unity.

Animals evolve special organs for the nursing of their young, and all
colonizing countries seem to have created special departments for the
supervision of their colonies. As the lacteal glands are only modified
skin-glands, are in certain lower genera (the Monotremata) at first
without teats and only in higher species develop into true mammae, so
the colonial department in the mother country is originally a mere
adaptation of existing agencies. A rather perfect example of this stage
is presented by the earliest of modern colonizing powers. The Casa de
la Contratacion de las Indias, established soon after the discovery of
South America, was organized in 1503. It granted licenses, equipped and
despatched fleets, received merchandise for export and cargoes imported
and contracted for their sale. It controlled the trade with Barbary and
the Canaries and supervised the shipping business of Cadiz and Seville.
Taking cognizance of all questions concerning marine trade, it was
advised by two jurists. It also kept the Spanish government informed
of all that concerned the colonies. It was a general board of colonial
marine trade, and such it remained even when, a few years later, its
more important colonial functions were absorbed by a higher department.

Where the colony has been founded by a commercial or by a colonizing
company, the mother country controls the colony through the directors
of the company; the office of the company is _pro tanto_ the
Colonial Office. Yet the later colonial department, as an organ of
government, is not a development of these shipping, commercial or
colonizing boards. It is a delegation of the sovereign authority.
This is at first exercised directly by the sovereign as it was
notably by Isabella and Ferdinand. It is next delegated, like almost
all functions of the ruler, to his privy council, which assigns the
business of colonies to a committee, which again may be set apart as
an independent administrative body. The Spanish Council of the Indies,
the separate English privy council for colonial affairs contemplated
in the first Virginian charter, the Council of Nine appointed by the
States-General of the Netherlands, the Swedish royal council, were
such bodies. Their powers are everywhere the same. The superintendence
of the whole colonial system is entrusted to them. They have supreme
jurisdiction over all the colonies. They appoint and may recall
viceroys, governors-general, governors and other local officers. They
can veto laws and ordinances made by colonial rulers or legislatures.
They frame constitutions for the colonies and enact laws. Through the
governors and other officers sent out by them, they minutely supervise
and incessantly interfere with the whole internal administration
of each colony. The tendency of this supreme council is to divorce
itself evermore from the privy council and become independent, till
at last it is transformed into a ministerial department. Yet an
amicable relationship (such as sometimes survives the divorce court)
long remains. The Colonial Committee of the privy council in England
was summoned as late as 1849, and the Judicial Committee still hears
appeals from colonial courts of justice. The government of the
commonwealth was naturally averse to the king's council, and a body
of special commissioners (Cromwell and Pym and Vane among them) was
appointed to govern the colonies.

The Restoration did not at once return to the old system. On the
contrary, a remarkable democratic advance was made. Recognizing that
though 'politics lie outside the profession of merchants' (as the
Swedish and British governments declared), yet trade is eminently
within their scope, the restored monarchy set up a Council of Trade and
Plantations, of whose forty members twenty were elected representatives
of the five merchant companies and the incorporated trades. But there
was ever a tendency, at least under the despotic rule of the Stuarts,
to revert to the privy council, and in 1674 a standing committee of
it was appointed Lords of the Committee of Trade and Plantations. The
change appears to have been unimportant. Trade still governed the
committee and shaped its policy.

The Board of Trade set up in 1696, rather by the House of Commons
than by the Ministry, marked the more popular character of the
revolution of 1688, and lasted for ninety years. As if foreshadowing
the despotic character of the English reaction against the greater
French revolution, this board was abolished by an act introduced by
the chief reactionary--Edmund Burke. A committee of the Privy Council
for Trade and Plantations was in 1786 again resorted to, and this
committee in a shadowy manner survived (perhaps it still survives)
till 1849, when it was for the last time summoned by Earl Grey. But
the real administration of the colonies had long been in the hands
of a department of state, directly responsible to Parliament, though
it was still a department that dealt with other affairs as well.
Specialization began in 1702 by the colonies being assigned to the
Secretary for the Southern Department. In 1768 a separate department
with a secretary was created for America, where almost all of the
colonies were then situated. After the loss of most of the American
colonies the new department was abolished in 1782. The colonies were
then annexed to the home department. In 1794 the newly created war
department nominally included the colonies, though these were not
actually united with it till the Committee for Trade and Plantations
ceased to act, seven years later. In 1854 a separate colonial
department, with an independent secretary of state, was finally
created.[A]

    [A] The history of the relations between the government of
        Great Britain and her colonies will be found in many books,
        but best in Mr. Egerton's comprehensive survey of British
        colonial policy.

As there were twenty-three secretaries in forty-one years, it will be
readily understood that the practical work of administration remained
with the permanent officials. With a longer tenure of office, previous
training and thorough mastery of details, they held all the threads of
colonial administration in their own hands. A newly-appointed minister,
with little knowledge of the colonies and no acquaintance at all with
the business of his department, was no match for an experienced officer
who had colonial affairs at his fingers' ends.

A mere clerk, unknown outside his office, though well known in
literature, could recall a governor; another, whose very name was
unknown till he died, recommended (that is, commanded on pain of
dismissal) a recent Governor of New Zealand to give away to his
ministers on a crucial exercise of the prerogative.

Nor is it in matters of routine alone that the permanent officers shape
the course of colonial administration. A strong-minded minister with
a policy of his own, like Lord Grey or Lord Carnarvon, will force his
subordinates to carry it out, but even here a still stronger-minded
under-secretary will often have his way. In 1848 Lord Grey, then
Secretary for the Colonies, summoned the aged and moribund Committee
(of the privy council) on Trade and Plantations to advise with him
on the policy to be adopted towards the Australian colonies. The
report was drafted by Sir James Stephen and we have no difficulty in
discovering in its far-sighted proposals and masculine style the mind
as well as the hand of the author of the essay on 'Hildebrand.' It is
often said that a state department is inevitably wedded to routine.
In the report just mentioned the striking feature is the outline of a
system of Australian federation that is only now on the point of being
realized. So far was the pedantic Colonial Office then, as it has often
been before and since, ahead of its subject colonies.

The other colonizing countries have followed the same line of
development. Beginning as direct delegations of the sovereign power
to a branch, first constituent and then separated, of the sovereign's
council, the department of colonies has been in course of time made an
independent ministry directly answerable to parliament. In bureaucratic
France the colonies since 1854 have been associated with the navy. On
the first of January, 1899, the empire on which the sun never set,
having lost the last of the dependencies that were once its glory,
abolished its colonial office. The sun had set on Spain to rise no
more.




TECHNICAL EDUCATION AT THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY.

BY PROFESSOR GEORGE F. SWAIN.


With the enormous progress in the arts and sciences which has
characterized especially the last half of the nineteenth century,
education has kept well abreast, although its progress has been gradual
and it is not always easy to recognize the great advances that have
been made. In the sciences, a discovery is made or a machine invented
that in the course of a few years forms the basis of a new industry,
gives occupation to thousands and places within the reach of almost
every one conveniences previously attainable only by the few. In
education no such sudden revolutions occur, and great changes are
introduced by degrees without producing any commotion or any surprise.
From the days of Erasmus and Rabelais, if not earlier, educational
reformers have urged the importance of studying things rather than
books about things, of cultivating the hand and eye as well as the
mind, of training the perceptive powers, of cultivating a habit of
observation and discrimination, and of developing the faculty of
judgment. Yet, notwithstanding all that has been said and written,
progress in this direction has until recently been very slow. Carlyle,
apparently looking at the matter almost from the old scholastic
standpoint, expressed the opinion that the true university of modern
times was a great library; books, not things, should be studied. It
would conform more to the modern point of view to say that the true
university of the twentieth century is a great laboratory. Even the
function of a library in our modern institutions of learning is perhaps
more that of a laboratory than that of a mere storehouse of facts and
opinions.

It is perhaps not too much to say that the development in the direction
indicated has been greatest in our own country; that the United
States have taken the lead in the revolution against the old method
of teaching, and that at the present time the higher schools of this
country are examples of the best practice and the highest development
of the laboratory method. It may, therefore, be of interest to give the
readers of this magazine a brief account of the school which has in
these respects been one of the foremost, if indeed it has not led the
schools of this country, the Massachusetts Institute of Technology.

[Illustration: THE ROGERS BUILDING, MASSACHUSETTS INSTITUTE OF
TECHNOLOGY, IS AT THE RIGHT, THE WALKER BUILDING AT THE LEFT.]

With the development of the natural sciences and the growth of the
constructive arts, natural science long ago gained a place in the
curricula of the great universities of Europe; and afterwards special
schools were founded for teaching the applications of science to the
arts. In France, the Ecole des Ponts et Chaussees, originally started
in 1747 as a drawing school, was organized in 1760 for the training of
engineers. In the States of Germany, a number of similar schools were
organized early in the present century. In America, the Rensselaer
Polytechnic Institute, the pioneer in technical education, was founded
in 1824, and was the only school devoted to applied science until the
forties, when Joseph Sheffield and Abbot Lawrence established the
schools which bear their names, in connection, respectively, with
Yale and Harvard. With the development of railroads, which dates from
the thirties, and of manufacturing, which began in this country but
a few years earlier, urgent need was felt for schools which should
fit younger men to grapple with the problems which the new industries
offered. These schools, however, maintained for many years but a
precarious existence and were quite elementary in character. The Civil
War interrupted their growth and absorbed for a time all the resources
of the nation; but its termination set free an abundant store of
energy, henceforward to seek its chief application in the development
of trade, commerce, manufacturing and industrial pursuits of every
kind. From this time the success of schools of technology was assured.
They were needed to supply young men for the development of the arts;
but, on the other hand, as in all things not purely material, they
were to create a demand for such men by first furnishing a supply.
Manufacturers and leaders of industrial enterprise soon found that
they could not afford to do without the services of young men trained
in scientific principles. In this way, by reversing the usual law of
supply and demand, these schools contributed powerfully to advance the
technical development of the country, far indeed beyond the measure
that may be inferred from the mere number of their graduates.

The Massachusetts Institute of Technology was chartered in 1861, and
first opened to students in 1865. Its claim to recognition as a leader
in the development of technical education may perhaps be summarized as
follows: It was the first school in the world to institute laboratory
instruction in physics and chemistry to students in large classes as a
part of the regular course of each candidate for a degree; the first
to equip a mining and metallurgical laboratory for the instruction of
students by actual treatment of ores in large quantities; the first to
establish a laboratory for teaching the nature and uses of steam, and
a laboratory for testing the strength of materials of construction in
commercial sizes; and the first in America to establish a department
of architecture. Later still, it was the first school in America to
establish distinct and specialized courses of study in electrical
engineering, in sanitary engineering, in chemical engineering and in
naval architecture.

The success of the school has been commensurate with its
progressiveness. It stands to-day the largest, most complete school of
its class in the United States, and one of the largest in the world.
The number of its students is 1,176, the number of its teachers,
including lecturers, 175. Excluding lecturers, the number of students
per teacher is only 8.7, a ratio which is a good general index of the
character of the instruction. The students come from 40 States and
Territories of the Union and from 12 foreign countries.

Before passing to a more detailed description of the work of its
various departments, some general characteristics of the school
should be mentioned. The first is the great variety of its courses
and the specialization of its instruction. It is a college of general
technology, embracing almost every branch of study which finds
application in the arts. There are thirteen distinct courses of study:
Civil and topographical engineering, mechanical engineering, mining
engineering and metallurgy, architecture, chemistry, electrical
engineering, biology, physics, general studies, chemical engineering,
sanitary engineering, geology and naval architecture. These several
departments mutually support and reinforce each other, and allow a
specialization of the instruction which would be impossible in a
smaller college with a less numerous staff of instructors. Thus,
at the Institute of Technology, there are not only professors of
civil engineering and of mechanical engineering, but professors
of mechanism, steam engineering, railroad engineering, highway
engineering, hydraulic engineering, topographical engineering, etc.
Again, the chemical staff of twenty-four persons is distributed over
general chemistry, analytical chemistry, organic chemistry, industrial
chemistry and sanitary chemistry. There are separate laboratories for
water analysis, for gas analysis, for food analysis, for dyeing and
bleaching, etc. In each of these there are teachers who are able to
give their entire time to instruction and research in a single line.

[Illustration: WILLIAM BARTON ROGERS, PRESIDENT, 1862-1870; 1878-1881.]

The second characteristic of the Institute is the predominance of
laboratory, shop and field practice, experiment and research. These
are used wherever it is found practicable to supplement, illustrate or
emphasize the work of the recitation or lecture-room.

The third characteristic of the Institute, and one which is absent in
the case of many similar schools, is the fact that a not inconsiderable
amount of general training has from the beginning been required of
every candidate for the degree. In some technical or scientific schools
there are no liberalizing studies, aside from those of a professional
character. The faculty of the institute have insisted that such studies
should be incorporated to a considerable extent in the curriculum of
every course, recognizing the fact that few students in technical
schools are graduates of colleges, and that the aim of the Institute
should be first of all to graduate broadly trained men. Aside from the
courses in liberal studies, a broad spirit is shown in the technical
courses themselves. The study of general principles is always the chief
end in view, and to it are strictly subordinated the acquirement of all
knacks, tricks of the trade or merely practical rules.

These characteristics of the Institute were impressed upon it
from the beginning by the master hand of its founder and first
president, William B. Rogers. President Rogers aimed to establish 'a
comprehensive, polytechnic college' which should provide a 'complete
system of industrial education.' It is now generally recognized that a
complete system of industrial education would consist of three parts:
First, manual training schools, for developing the eye and hand, not
with the object of producing artisans, but for training alone. Second,
trade schools for special training in the technique of the different
trades. Third, higher technical schools for training in the fundamental
principles of the sciences, and fitting men in the broadest way to
become leaders in the application of the sciences to the arts. Manual
training is now generally recognized as a desirable addition to every
scheme of public instruction and a powerful adjunct to every technical
school. It was not indicated in the original scheme of the Institute,
but was added in 1877 through the wisdom of President Runkle, as a
result of the exhibition in Philadelphia of the results obtained in
Russia by instruction of this kind. Trade schools, for the training of
artisans, were never included in the scheme of President Rogers, and
are not now, either in America or Europe, considered suitable adjuncts
to so-called technical schools, although they are very desirable
as special and independent institutions. The original plan for the
Institute contemplated simply a school of the last-named kind, together
with provision for evening lectures, to which outsiders should be
admitted, and which it was expected would be of benefit to artisans;
and also the establishment of a museum of arts, and of a society of
arts which should hold regular meetings and which should be the medium
for the communication to the public of scientific discoveries and
inventions. It may be as well to state here that the museum of arts was
never established except in so far as the separate departments of the
Institute have accumulated collections; but that the society of arts,
which held its first meeting in 1862, has been continued to the present
time. Many important inventions, as for instance the earliest forms of
the Bell telephone, were first publicly exhibited at its meetings.

In outlining his plan, President Rogers showed wonderful keenness and
foresight. With the added experience of the succeeding forty years,
it would scarcely be possible to make a more complete statement of
what experience has shown to be the best method of organization. In
fact, his Scope and Plan of the School of Industrial Science of the
Massachusetts Institute of Technology may be said to be the first step
toward a new order of things in education, and contains the first clear
statement of the desirability of teaching physics, mining, metallurgy
and other branches by the laboratory method.

[Illustration: THE HENRY L. PIERCE BUILDING AND ENGINEERING BUILDING.]

Let us now see what has been the result of the nearly forty years
of development since President Rogers outlined his plan. Originally
confined to one building, the growing needs of the school have led to
the erection of five others, in addition to a gymnasium. The original
building, completed in 1865, is now known as the Rogers Building, after
the founder of the school; while the one next erected, in 1883, is
named after the third president, the late General Francis A. Walker.
These two buildings each measure about 90 by 150 feet, and in addition
to a building occupied by the Boston Society of Natural History,
occupy one entire square nearly in the heart of the city, and in
close proximity to the Public Library and the Art Museum. Three other
buildings, which adjoin each other and now form one structure, are
situated about six hundred feet distant and form the front and part of
one side of what will some day be one large quadrangle. The first of
these buildings to be erected was the Engineering Building, built in
1889, measuring 52 by 148 feet on the ground, adjoining which is a
building erected in 1892, 58 by 68 feet on the ground, and now forming
part of the Engineering Building. Adjoining this is the Henry L. Pierce
Building, erected in 1898, and measuring 58 by 160 feet. In addition to
these buildings are the workshops, about a quarter of a mile distant,
covering 24,000 square feet, and a gymnasium and drill hall.

[Illustration: ONE OF THE CHEMICAL LABORATORIES.]

The first laboratory to be established at the institute was that of
chemistry, and this leads us to speak first of the department of
chemistry. The laboratory of general chemistry was opened in 1876
under the direction of Professors Eliot[B] and Storer, and is believed
to be the first laboratory where instruction was given in general
chemistry to classes of considerable size. From small beginnings, this
department has rapidly grown under the able direction of such men as
James M. Crafts, (since 1897 president of the Institute), William
Ripley Nichols, Charles H. Wing, Lewis M. Norton and Thomas M. Drown,
until now the instructing force consists of five professors, thirteen
instructors and six assistants, a total teaching force of twenty-four,
in addition to seven or eight lecturers on chemical subjects. The
department occupies the two upper floors in the Walker Building,
together with about half of one floor in the Henry L. Pierce Building,
devoted to industrial chemistry. The laboratories, which are said to be
the largest and best equipped in the United States, are known as the
Kidder chemical laboratories, having been so named in recognition of
the generosity of the late Jerome S. Kidder. They comprise twenty-two
separate laboratories, three lecture-rooms, a reading-room and library,
two balance-rooms, offices and supply-rooms, making forty rooms in
all, with accommodation for seven hundred students. Besides the large
laboratories for general chemistry and analytical chemistry, there are
smaller laboratories for volumetric analysis, for organic chemistry,
for sanitary chemistry with special reference to the analysis of
water and air, for oil and gas analysis, for the optical and chemical
examination of sugars, starches, etc., for the determination of
molecular weights, and so on. In the industrial laboratories, the
students are taught how to manufacture chemicals with due regard to
economy of material, space and time. There is also a special laboratory
for textile coloring, with printing machines and all the necessary
equipment of baths, dryers, etc., for experimental dyeing and coloring.
In this laboratory the preparation and use of coloring matters are
taught with the object of fitting young men for positions in dye works.
A course of lectures in textile coloring was first introduced in 1888
and the laboratory course in 1889.

    [B] Now President Eliot of Harvard.

A large amount of original work is accomplished each year in these
laboratories, both by students and professors. During the year 1897-98,
for instance, four books and sixteen articles on chemical subjects came
from them. In the development of sanitary chemistry the Institute has
been particularly prominent. Beginning with the careful and thorough
investigations made by Professor Nichols for the State Board of Health,
the reputation of the institute in this direction has been still
further increased by the recent extensive investigations of Professor
Drown and Mrs. Ellen H. Richards, made for the same board in connection
with the examination of the purity of the water supplies of the State,
and the experiments at Lawrence relating to the best methods for
purifying water and disposing of the sewage of inland towns.

An illustration of the policy of the school in separating out a
subject whenever it is found capable of complete theoretical and
practical treatment and putting it into the hands of some assistant
professor for development, is found in the laboratory for gas and oil
analysis, which for some years has been in charge of Dr. Gill. In
this laboratory, investigations are made relating to chimney gases,
as well as questions of fuel, furnaces, gas firing, etc., while oils
are tested and analyzed with reference to specific gravity, viscosity,
friction, flashing and firing points, and liability to spontaneous
combustion. The same policy is further illustrated in the establishment
in 1894 of a well equipped laboratory devoted entirely to physical
chemistry; that is to say, to the relations between chemical changes
and heat, light and electricity. This laboratory, under the charge of
Dr. H. M. Goodwin, occupies a room measuring 28 by 29-1/2 feet, and is
devoted to photographic work, experiments in electrical conductivity,
thermo-chemistry, molecular weight determinations and experiments
in chemical dynamics. More recently still, a complete option in
electro-chemistry has been established, to meet a growing demand.

[Illustration: PART OF THE ELECTRICAL ENGINEERING LABORATORY.]

Still another illustration of the policy of specialization is afforded
by the action of the Institute in establishing new courses of study,
extending through the entire four years, whenever the need is felt
for men trained in a direction not hitherto specially provided for.
Thus, in 1888 a new course was established in chemical engineering.
The chemical engineer is not primarily a chemist, but a mechanical
engineer--one, however, who has given special attention to such
problems as the construction of dye works and bleacheries, sugar
refineries, soap works, paper and pulp manufactories, fertilizer works,
chemical works, and in general all the problems of chemical machinery
and manufacturing. That this new course filled a real want was soon
made evident. The first class, that of '91, contained seven graduates,
while eighty-eight students in all have now been graduated and are for
the most part engaged in chemical works.

The physical laboratories of the Institute are now known as the Rogers
laboratories. Although they formed perhaps the central feature of
President Rogers' plan, financial and other exigencies prevented their
being established when the school was opened. In 1869, Prof. Edward
C. Pickering, then in charge of the department of physics, submitted
a scheme to the government of the Institute entitled 'Plan of the
Physical Laboratory.' This plan was adopted and carried out in the
autumn of 1869 and has been in use ever since. It is worthy of remark
that the original statement of Professor Rogers with reference to
laboratory instruction in physics contained no mention of electricity,
then a subordinate branch, but one whose development since has caused
it to occupy the leading place in any physical department. In 1882 the
corporation established a course in electrical engineering, setting an
example which has since been followed by almost every large technical
school, and founding a course destined in a few years to become one of
the largest in the Institute.

At present the department of physics and electrical engineering, under
the head of Prof. Charles R. Cross, has an active teaching force of
one professor, four assistant professors, six instructors and three
assistants, a total of fourteen. In addition to these, there are
twelve lecturers on special topics, including many men eminent in
their profession. The Rogers laboratories occupy sixteen rooms in the
Walker Building, including two lecture-rooms and ten laboratories.
As in the case of the chemical department, these laboratories are
highly specialized. There is a laboratory for general physics, one
for electrical measurements, two rooms devoted to a laboratory for
electrical engineering, containing two distinct power plants driven by
steam engines of 100 and 150 horse-power, with a large number of dynamo
machines, transformers and a great variety of other apparatus arranged
for purposes of instruction, the mere enumeration of which would
occupy several pages. Moreover, a lighting and power plant in the new
building on Trinity Place is available for experiments and instruction.
Besides these, there are rooms for photometry, for heat measurements,
for acoustics, for optics and for photography. In fact, probably no
department of the Institute is more fully equipped than this, the
wealth of apparatus being so great that the casual visitor is confused
by the network of wires and machinery which surround him.

The interdependent and harmonious work of the various departments
of the Institute is shown in the development of special lecture
and laboratory courses, and is in marked contrast to the policy of
departmental isolation sometimes practiced. Thus, in 1889, two new
courses of instruction were established by the physical department in
response to the demand of the department of mining; namely, the course
in heat measurements, including measurements of high temperatures,
the determination of the calorific power of fuels, etc., and a course
on the applications of electro-metallurgy to chemical analysis, the
reduction of ores and similar problems. The equipment of calorimeters,
pyrometers, etc., in the heat laboratory is said to be so large as to
permit a more complete examination of the efficiency of fuels than has
hitherto been possible anywhere.

[Illustration: SMELTING FURNACE IN JOHN CUMMINGS LABORATORY OF MINING
AND METALLURGY.]

Perhaps the greatest innovation made by the Institute in the early
days was in establishing a laboratory for the teaching of mining
and metallurgy. Previous to 1871 metallurgical work was done in the
chemical laboratories, but in that year the mining and metallurgical
laboratory was put into operation through the efforts of President
Runkle, Professor Richards and Professor Ordway. Prior to this date,
there were assaying or metallurgical laboratories at the Ecole des
Mines at Paris, the Royal School of Mines in London, the German
Mining Schools at Freiberg and Clausthal and Berlin, and also in
several technical schools in this country. The German mining schools
were situated beside smelting works, but the plants could not often
be used for experiments by professors or students in a way to alter
the usual method of running. In all these laboratories, however, the
apparatus was designed to treat quantities of ore not exceeding a few
ounces for each test. The Institute laboratories were the first in the
world which were designed for the treatment of ores in economical
quantities of from five hundred pounds to three tons, and used entirely
for purposes of instruction. They are now known as the John Cummings
laboratories, in memory of one who for many years was treasurer of
the Institute and one of its most devoted friends. They now occupy
the entire basement of the Rogers Building, and include laboratories
for milling, concentrating and smelting ores, as well as for testing
them by assay and by blowpipe. The development of these laboratories
from the small beginnings of 1871 has been mainly due to the efforts
of Prof. R. H. Richards, past president of the American Institute
of Mining Engineers, whose contributions on methods of ore dressing
are well known to mining engineers. The staff of this department
also includes Prof. H. O. Hofman, well known for his researches in
metallurgy.

[Illustration: THREE STAMP MILL IN MINING LABORATORY.]

Mention should here be made of the department of geology, which is
under the direction of Professors Niles, Crosby and Barton, and
which now occupies commodious quarters comprising the greater part
of a floor in the Henry L. Pierce Building. The collections of this
department number many thousands, and are supplemented by those of
the Society of Natural History, which are available for purposes of
instruction. As would be expected in a school of applied science, the
economic aspects of geology are kept closely in view, and the work
is adapted to the particular object to be attained. The student in
architecture, for instance, receives a course in geology in which the
study of building stones is a prominent feature.

An engineering laboratory formed part of the original scheme of
President Rogers, although he included it under the head of physics
and did not anticipate the importance which has since attached to it.
Such a laboratory, especially devoted to engineering, was established
on a small scale in 1874, through the efforts of Professor Whitaker.
An engine for experimental purposes was presented to the institute
by Mr. G. B. Dixwell, and this, with other apparatus, constituted
what is believed to have been the first engineering laboratory in the
world for the regular instruction of classes. For lack of funds and
space, it was not much developed until 1882, but since that time it
has been brought to a high state of efficiency. To-day the engineering
laboratories, as they are called, which include laboratories of steam
engineering, hydraulics, for the testing of materials and a room
containing cotton machinery, occupy a floor space of 21,380 square
feet on the two lower floors of the Engineering and Pierce Buildings.
In addition to this, there are workshops which will be referred to
again. It would be tedious to enumerate the great variety of apparatus
to be found in these laboratories, but a few important points may be
mentioned. In the steam laboratory a 150 horse-power triple-expansion
Corliss engine, the first of its kind of practical size ever arranged
for experimental purposes, was purchased in 1890 and is regularly used
for testing purposes. A second engine of 225 horse-power was added two
years ago, transferring its power through a rope drive. Besides these
two large engines, there are a number of smaller ones for experimental
purposes and the study of valve setting, and, in addition, there are
gas engines, hot-air engines and other apparatus. There is also a
collection of cotton machinery sufficient to make clear to the student
the mechanism of the various machines.

[Illustration: HORIZONTAL EMERY TESTING MACHINE OF 300,000 POUNDS
CAPACITY IN THE APPLIED MECHANICS LABORATORY.]

The hydraulic laboratory is well equipped for the study of the laws
of flowing water, having a steel tank five feet in diameter and
twenty-seven feet high, with a system of stand-pipes eighty-five feet
high, reaching to the top of the building. This tank is furnished with
gates and other apparatus suitable for experiments on the flow from
orifices, and connected with a system of horizontal pipes by which a
large variety of other investigations may be carried on. Among the
other apparatus of interest may be mentioned two impact water wheels,
placed in housings with glass sides so that the action of the water on
striking the buckets can be observed.

Some experiments have already been made in the laboratory on the flow
of air, the results of which have been communicated by Professor
Peabody to the American Society of Mechanical Engineers. It is now
intended to continue the study of the flow of air and its use as a
motive power in great detail, just as the flow of water is studied, and
an air compressor of 100 horse-power, which will produce a pressure of
twenty-five hundred pounds, is now being installed.

[Illustration: THE 100,000 POUND BEAM MACHINE IN THE APPLIED MECHANICS
LABORATORY.]

The laboratory for testing the strength of materials was established in
1881 by Prof. G. Lanza, and has since been extensively developed under
his direction, until it is now one of the most complete in the world.
It is perhaps not too much to say that the experiments made in this
laboratory have in some respects revolutionized the ideas of engineers.
Previous to its establishment, the only tests of timber that had been
made were upon small selected specimens one or two inches square and a
few feet long. The results of these tests had been used for years by
architects and engineers, and they were given in all the engineering
handbooks. In the Institute laboratory there were conducted the first
systematic and extended tests of beams of commercial size. The results
soon showed that the strength of such timber was a great deal less
than previous tests on small beams had indicated, and the practice of
engineers and architects has since that time been completely modified
through the results obtained in this and similar laboratories. In this
way does the work of such a laboratory become of direct and lasting
value to the arts. The central piece of apparatus of the Institute
laboratory is the Emery machine, similar to the great machine at the
Watertown arsenal, with a capacity of three hundred thousand pounds.
But in addition to this machine there are a dozen or more other
machines designed to test beams, columns, rope, wire and, in fact,
materials of every kind and in every form. An interesting machine is
that for testing shafts in torsion, and it is instructive to see it
twist off with apparent ease a steel shaft three inches in diameter,
twisting the fibers before they break till the rod resembles a barber's
pole. There are also beam-testing machines with capacities up to one
hundred thousand pounds, in which not only beams but wooden trusses
may be tested to the breaking point. Some of the apparatus is of great
delicacy; for instance, one instrument will measure the twist of a
steel shaft two and a half inches in diameter and six feet long so
delicately that the effect of a twist given by one's hand is distinctly
visible; scientifically speaking, it will measure an angle of twist of
two seconds. There is also a machine designed for testing stone arches,
having a capacity of four hundred thousand pounds and suitable for an
investigation of many questions concerning these uncertain structures;
also machinery for studying the wear of brake shoes and wheel tires,
a subject in regard to which there is room for much investigation.
Finally, mention should be made of machinery for investigating the
interesting subject of the effect of repetition of stress.

[Illustration: FORGE SHOP.]

The tests performed in the engineering laboratory cover almost the
entire range of mechanical science. Sometimes investigations are
carried on through a number of years; for instance, during three
successive years experiments were conducted and formed the subject of
theses on the proper method of counterbalancing the reciprocating parts
of a locomotive. Nor are the tests performed by the Institute students
as a regular part of their instruction confined to these laboratories,
as is made evident by the fifty-hour test of the West End Street
Railway power station and the twenty-four hour test of the pumping
engine at Chestnut Hill, both recently carried out.

In connection with the engineering laboratories, brief mention may be
made of the shops, which form an important adjunct of the laboratories.
They consist of a shop for carpentry, wood-turning and pattern-making,
equipped with forty carpenters' benches, thirty-six pattern-makers'
benches and a full equipment of saws, planers, lathes, etc.; a foundry
with a cupola furnace for melting iron, thirty-two moulders' benches,
two brass furnaces and a core-oven; a forge shop with thirty-two
forges, a power hammer, vises, etc.; a machine shop with about forty
lathes, together with drills, planers and all the other necessary
apparatus used in machine tool work.

The magnitude of the Institute laboratories is shown by the following
statements: The total horse-power of steam and other engines is nine
hundred and eighty-three; the total capacity of tension, compression
and transverse testing machines is over eight hundred thousand pounds,
and of torsion testing machines about one hundred and fifty-six
thousand inch pounds; the total horse-power of hydraulic motors is
sixty-two; and the total capacity of pumps is thirty-two hundred
gallons per minute.

The engineering laboratories are used by students of all the
engineering departments, that is to say, by a large majority of the
students in the school. The benefit derived by this actual contact
with materials and with machines of commercial size, under proper
instruction, is believed to be very great.

The department of mechanical engineering, one of the original
departments, is now the largest in the school, having a force of
instruction of five professors and twelve instructors and assistants.
As an offshoot of it, a department of naval architecture was
established in 1893, after a preliminary experience of four years with
an option in this direction. This was the first course of its kind
established in this country. It is somewhat remarkable, considering
the preeminence that America has long enjoyed in the building of ships
and marine engines, that our technical schools should for so long have
failed to offer specialized instruction in these important branches.
Schools devoted to these subjects have long existed abroad. The French
Government School of Naval Architecture was established in 1865 for
the purpose of educating young men for the Government service. To
this school foreigners are admitted under certain restrictions. In
England the first school of naval architecture was opened in 1871,
but no systematic instruction seems to have been provided until 1864.
At present, however, the Royal Naval College, at Greenwich, gives
excellent and thorough instruction to young men desiring to enter
the Government service. There has also been for a number of years an
excellent course of study in naval architecture at the University of
Glasgow. The Institute of Technology established in 1888 an elementary
course in ship construction, and this was followed in 1890 by a
specialized option in naval architecture extending through the four
years. Already forty-one men have graduated from this course.

[Illustration: JOHN D. RUNKLE, PRESIDENT, 1870-1878.]

One of the large departments of the school is that of architecture.
Forming one of the original departments established at the beginning
of the Institute in 1865, when there was no similar department
in this country, it may fairly be affirmed to have led in the
development of instruction in this important profession. It was for
many years in charge of Prof. W. R. Ware, who left the Institute in
1880 to assume charge of the newly established department at Columbia
College. In common with the other departments of the Institute, that
of architecture has developed enormously within recent years. Three
times since 1883 has the department been obliged to change its location
in order to meet the continued need of expansion. From the original
small quarters in the upper floor of the Rogers Building, it has
grown so that it now occupies two and one half floors in the Pierce
Building, besides a large room for modelling in another building. The
drawing-rooms now accommodate over two hundred students. The department
has a magnificent library and a very large collection of photographs
and lantern slides. Under the careful management of Prof. F. W.
Chandler, who at the same time is head of the Architectural Department
of the city and member of the Fine Arts Commission, it has now attained
a most enviable reputation. Institute students competed for several
years for the prizes offered by the New York Societe des Beaux Arts,
and in each competition in which they entered they carried off the gold
medal and the highest honors. In the three competitions of '94-'95, no
less than seventy sets of drawings were submitted by all competitors.
The two gold medals, four first mentions and two second mentions were
awarded to Institute students. Of the nine designs sent from the
Institute, six were placed by the jury among the first eight of the
seventy designs submitted; two received second place and one was put
out of competition because of too great deviation from the preliminary
sketch. This great success is doubtless due to the rigorous training
which the students receive in architectural design at the hands of
Professor Despradelle, himself a graduate of the Ecole des Beaux Arts,
a winner of high honors in Paris, and of the third prize in the recent
Phoebe Hearst world competition for the new buildings of the University
of California, and within a few weeks the winner of the first medal in
architecture in the Paris Salon of 1900. For three years the students
are continually engaged upon architectural design, and the work of each
student is examined and criticised before the class by a jury from
the Boston Society of Architects. Students in architecture have also
the opportunity, if they desire, of taking an option in architectural
engineering, in which they are given a course in the theory and design
of structures as rigid as that received by the students in civil
engineering. The relations between architecture and engineering are
exceedingly close and are becoming closer every year. The work of the
architect, aside from the aesthetic design of his buildings, is becoming
more and more like the work of the engineer, and requires a thorough
knowledge of engineering construction.

During the past year, after very careful consideration, the faculty
has also established an option in the course of architecture, devoted
particularly to landscape architecture, including, besides a large
amount of work in architecture proper, instruction in horticulture and
landscape design, on the one hand, and in surveying, topographical
drawing, drainage, etc., on the other hand. The landscape architect
has heretofore had no opportunity to secure a thorough training in
his profession, except by passing through an apprenticeship, as
was formerly necessary in the older professions. On account of the
steady increase in this country in the demand for trained landscape
architects and the increasing attention which is now being paid by
our municipalities to questions concerning public parks, and also by
private individuals to the beautifying of private grounds, there seems
now to be an unusual opportunity for young men to devote themselves to
this branch of the profession. As usual, the Institute of Technology
is early in the field with a course designed to this end.

[Illustration: HYDRAULIC SURVEYING IN THE ESSEX CANAL, LOWELL.]

The last of the engineering departments to be considered and one of the
largest, is that of civil engineering, a department established when
the Institute was founded, and until 1881 under the direction of that
accomplished scholar and teacher, Prof. J. B. Henck, and since 1887 in
charge of the writer. This department has grown since 1886 from four to
eleven teachers, and from sixty to one hundred and fifty-three students
in the three upper classes. It now occupies the two upper floors of
the Engineering Building, or about twenty-three thousand square feet.
In recognition of the increasing importance of sanitary questions
affecting the health of communities, a new branch of civil engineering
was recognized by the Institute in 1889 by the establishment of a
regular four years' course in sanitary engineering, in which particular
attention is directed to such problems, and students are afforded
opportunities of studying the bearing of chemistry and biology upon
them. Here again the breadth and specialization of the work at the
Institute was shown, rendering it possible with no change in the
teaching force and with no disarrangement of studies, to establish such
a course of instruction as soon as the need for it became apparent.

Interesting work has been done under the direction of Professor
Burton, professor of topographical engineering, in connection with
the measurement of base lines with the steel tape. After devising
an apparatus for holding and supporting the tape, and measuring the
coefficient of expansion of actual tapes, an application was recently
made of the thermophone for determining the exact average temperature
of the tape. This instrument, which was invented a few years ago by two
Institute graduates, allows the average temperature of the tape to be
measured within half a degree.

An interesting department of the Institute, and one that has of recent
years assumed great practical importance, is that of biology. It was
organized in 1882, as an outgrowth of what was prior to that date
the course in natural history, and now has a teaching force of six,
under the direction of Prof. William T. Sedgwick, and occupies, with
its laboratories and lecture-rooms, one entire floor of the Pierce
Building. There are five distinct laboratories, fully equipped,
with private rooms, store and preparation rooms, and a library and
reading-room, and it is perhaps safe to say that nowhere in the United
States is there so compact or well arranged a series of laboratories
devoted chiefly to the sanitary, hygienic and industrial aspects of
biology. The great advances in sanitary science in recent years have
made bacteriology one of the most important, as well as one of the most
practical, of the biological sciences, and the biologist has taken his
place beside the chemist and the engineer in the study of the science
and art of public sanitation. But bacteriology is of importance,
not only in sanitary science, but also in its industrial relations.
Great industries, like those connected with food preserving, canning,
vinegar making, tanning and brewing, depend upon the activity or the
exclusion of micro-organisms. As might be expected in a school of
applied science, the development of the biological department in the
Institute has been mainly along sanitary and industrial lines, rather
than in the direction of zoology. The biological work in connection
with the recent important investigations of the State Board of Health
regarding the purification of water and the disposal of sewage, was
done at the Institute, and early led to special instruction in these
directions. In 1894 a course was established in the micro-organisms of
fermentation, not only new to the Institute, but, it is believed, to
the United States. Important researches had been made in Denmark in
these lines, and in order to become thoroughly familiar with them, one
of the instructors of the department spent a summer in the laboratory
of Alfred Jorgensen, in Copenhagen. In 1896, a more elaborate course,
that in industrial biology, was established, and since that time
special studies have been made in various lines, such as the efficiency
of sterilizing processes, the preparation of canned goods and the
cultivation of butter bacteria. This department is destined to still
greater development in the near future, and its laboratories are finely
equipped in every direction.

[Illustration: FRANCIS A. WALKER, PRESIDENT, 1881-1897.]

Reference to the different departments in the Institute would not be
complete without brief mention of its department of general studies. It
is perhaps seldom recognized, but it is nevertheless a fact that the
Institute, although primarily a technical school, is better equipped
for giving instruction in languages, in history, in economics and
statistics and in political science than many classical institutions.
Indeed, the only important department of study which is found in such
institutions, and for which no provision is made at the Institute, is
that of ancient languages. The force of instruction in the department
of general studies, leaving out of consideration the department of
modern languages, comprises two professors, one associate professor,
three assistant professors, one instructor and one assistant, a total
of eight, probably a larger number than is found in any but the very
largest colleges. In the department of modern languages, there is one
professor, one associate professor, one assistant professor and four
instructors. There are offered ten distinct courses in English, eleven
in modern languages, eight in history and twenty in economics and
statistics and in political science. As already stated, it has been a
fundamental principle in the government of the school that all regular
students should receive a not inconsiderable amount of instruction in
these subjects, but in addition to the engineering and other technical
courses, there is a so-called course in general studies, designed to
train young men for business occupations, in which, besides thorough
courses in chemistry, physics and other sciences, a large amount of
time is devoted to the general studies which have been referred to. The
late president of the Institute, General Walker, whose principal work,
aside from that relating to education, lay in the field of economics
and statistics, took great interest in the development of this general
course, and to him, more than to anybody else, is due its present high
standard. Seventy-eight young men have graduated from the department,
and in many respects its course of study offers advantages over the
usual college course.

Summer schools are maintained by the Institute in the departments of
civil engineering, mining engineering and architecture. That in civil
engineering affords continuous field practice in geodesy and hydraulics
during about a month. That in mining engineering affords students
an opportunity to visit mining or metallurgical works and to become
practically acquainted with the methods employed by actually taking
part in them. These summer schools in mining and metallurgy have been
held in all parts of the country, from Nova Scotia to Lake Superior and
Colorado. The summer school in architecture consists not infrequently
of a trip abroad, with detailed studies and sketches of special types
of architecture.

The Institute also offers extended courses of free evening lectures,
of which twenty courses of twelve lectures each were given during the
past year. These courses, established by the trustee of the Lowell
Institute under the supervision of the Institute, correspond to one
portion of President Rogers's original plan, and are fully appreciated
by young men who cannot afford the time for a complete and consecutive
education. The trustee of the Lowell Institute also established in
1872, and has maintained ever since, a special school of practical
design, under the supervision of the Institute, in which young men
and women are given free instruction in the art of making patterns
for prints, ginghams, silks, laces, paper hangings, carpets, etc.;
the object being to fit them to engage in the textile industries
especially, but also in other branches of manufacture in which taste in
form and color is an essential element for success.

Mention may be made here of the fact that all work at the Institute is
open to women on the same terms as to men. As early as 1867, among
the Lowell free courses, there were two chemical courses open to both
sexes, and soon afterward women were admitted to the regular work of
the school. The first woman to graduate was Mrs. Ellen H. Richards, in
1873, and since that time forty-eight women have received the degree.
This number, however, is no measure of the part which women have taken
in the work of the school, for a large majority of those who attend are
special students. During the year 1899-1900, there were fifty-three
women studying at the school, principally in the departments of
chemistry, biology, geology, physics and architecture. From the
last-named course eleven young women have graduated, one of whom was
the designer of the Woman's Building at the Chicago Exposition.

One peculiarity of the Institute which has not been mentioned is
the sub-division of its libraries. Instead of having one general
library, each department has its special library, conveniently located
with reference to its rooms. This involves a slight duplication of
books, but is of the greatest advantage to students and teachers
for consultation. The Institute libraries are not large, compared
with the libraries of many colleges and universities, but they are
remarkably rich along the lines of the special topics to which they
are of necessity principally devoted, and particularly in scientific
periodicals. The total number of periodicals in all languages regularly
received at the Institute, not including a large number of official
reports, is eight hundred and forty-seven. In the engineering library
alone there are one hundred and seventy-three. It is believed that
this forms one of the largest collections of scientific journals to be
found anywhere. The Institute publishes a scientific magazine, known
as the Technology Quarterly, which was established in 1887, and is
the official organ for the publication of the results of tests in the
laboratories and of special investigations by members of the staff
and by students and alumni. The Association of Class Secretaries also
publishes the Technology Review, a more popular quarterly, established
only two years ago, and devoted to the social and general interests
of the Institute. In 1896 the Technology Club was started, occupying
a building near the Institute and affording alumni and students the
social advantages of a clubhouse. The alumni of the Institute now
number two thousand three hundred and thirty-nine; they maintain an
Alumni Association which holds annual meetings, and seven local branch
associations which are scattered over the country from the Connecticut
Valley to Colorado.

[Illustration: JAMES M. CRAFTS, PRESIDENT, 1897-1900.]

In reviewing the success which this school has attained, the question
naturally presents itself: To what is this success due? Let me here
record my conviction that it has been due mainly to the courage and
devotion of its corporation and of the presidents who have directed its
policy. In this respect no institution was ever more fortunate. With a
guiding body possessed of the courage and faith that have animated the
corporation of the institution from the earliest days, and especially
with the able men who have been its presidents, success was assured.
While the school was yet struggling for its very existence, with few
friends and little money, they never faltered. They have not hesitated
again and again to plunge the school deeply into debt when its needs
required it, trusting to the generosity of New England that it should
not be allowed to be crippled, and each time has their confidence been
justified. Poverty has never been permitted to impair the efficiency
of the school. As President Crafts remarked in a recent annual report,
"We are less favored than many neighboring institutions in building
space, but we have always followed the wise policy of keeping in the
foremost rank and in some departments leading the way in supplying the
best methods and apparatus for teaching and for making investigation.
We have run in debt to buy them, and run still further in debt to
build houses to hold them, but we have always had them when the head of
a department told the government of the school that they were necessary
to the most efficient teaching of his science." With a corporation
acting on such a principle there could be no failure. It is true that
the faculty have stood unfalteringly, even in the darkest days, for
high scholarship; and equally true that the school has been remarkably
fortunate in the character of the young men who have sought its halls,
but no faculty and no body of students could have brought success
with a corporation less broadminded and courageous. Let me here add
my tribute to the work which was done by the late General Francis A.
Walker, president of the institute from 1881 till 1897. Probably no
single person did more to secure the success of the school than he.
His great administrative ability, his wide acquaintance, his accurate
judgment of men, his magnificent courage and his splendid enthusiasm,
were factors in the development of the school whose importance it is
difficult to overestimate.

General Walker was succeeded by President James M. Crafts, who had been
connected with the Institute for many years as professor of chemistry,
and under whose energetic administration the progress of the Institute
has been steadily continued. In fact, thanks to some unexpected
additions to the funds of the school, its material resources and its
equipment have been more enlarged and extended during the past three
years than in many years previous. Only a few months ago, however,
President Crafts, desiring to devote himself more uninterruptedly
to the pursuit of the science which first awakened his enthusiasm
and in which he has attained such eminent distinction, both in this
country and abroad, decided to relinquish his office. The corporation
has chosen as his successor, Dr. Henry S. Pritchett, for many years
professor of astronomy in Washington University, St. Louis, and for
the past few years superintendent of the Coast and Geodetic Survey at
Washington. A more fortunate selection could not have been made, and
the well-known scientific and administrative ability of Dr. Pritchett
will no doubt be the means not only of maintaining the present high
reputation of the school, but of extending and enlarging it.

Unfortunately, the Institute is still unendowed in the sense that
its receipts from invested property constitute but a very small part
of the means required to carry on the school. To quote from one of
President Walker's reports, "No other institution of our size but has
two, three or four times the amount of wealth to draw upon which we
possess. It has only been exceeding good fortune, combined with extreme
courage, energy and self-devotion on the part of its trustees and
teachers that has more than once rescued the school from paralysis,
if not from extinction." In 1898-'99, the total expenditures of the
school were about $367,500, while the current receipts were about
$347,500, showing a deficit of about $20,000. Of the current receipts,
$207,000, or 59 per cent, were from students' fees. Dividing the
total expenditures by the number of students, we find an expenditure
of $314 per student, without counting interest on the value of land
and buildings, while the tuition fee is $200. The invested funds of
the Institute amount to but $1,917,000. All gifts and legacies, with
the exception of this amount, have had to go into land, buildings and
equipment. Between 1888 and 1899 the Institute has been obliged to
spend $350,000 for land, the purchase of which has been a great burden,
and within a few years a further expenditure of $260,000 in this
direction has been made.

[Illustration: HENRY S. PRITCHETT, PRESIDENT-ELECT OF THE MASSACHUSETTS
INSTITUTE OF TECHNOLOGY.]

The bearing of these figures will perhaps be realized by comparing them
with similar figures regarding Cornell University, which is largely
a technical school, since nearly one half of its students pursue
technical courses similar to those in the Institute. In 1898 the total
income of that university was $583,000, of which about $121,000, or
only 20 per cent, was received from tuition fees. Its invested funds
amounted to $6,446,818.

The State has generously given aid to the Institute in some of
its most trying times; as in 1888, when it gave $200,000, one
half unconditionally and the other half for the support of free
scholarships; and again in 1895, when it granted unconditionally
$25,000 a year for six years and $2,000 a year additional for
scholarships. Although the school has a very inadequate endowment, yet
the future looks bright. It is significant of the general appreciation
of its work that men and women who have not received a technical
education have devoted a large part of their fortunes to providing such
education for others. Among the recent benefactors of the Institute we
may name Henry L. Pierce, John W. Randall, Mrs. Julia B. Huntington
James and Edward Austin, who, within less than three years have
bequeathed nearly a million and a half dollars to the school. If the
large gifts of recent years are continued, the school will before long
be put financially upon a level with its neighbors. May we not hope
that as the applications of science to the arts enrich the alumni and
friends of the Institute, they may help to make the road easy for their
successors by devoting a part of their riches to the advancement of
technical education?




THE PSYCHOLOGY OF CRAZES.

BY PROFESSOR G. T. W. PATRICK,

UNIVERSITY OF IOWA.


A well-known Washington newspaper correspondent, writing of the recent
Congress of the Daughters of the American Revolution and its disorderly
meetings, says: "It is the unanimous opinion of those who have attended
the congress that, while the Daughters of the American Revolution,
individually, are nearly all intellectual, refined and attractive
women, collectively they are an uncontrollable mob." Why is the social
conduct of human beings different from their conduct as individuals?
This is the problem of the new science of social psychology. The
following study of crazes and epidemics is offered as a slight
contribution to this science.

By way of preface it might be said that a good deal of the confusion as
to the subject matter of social psychology would be avoided if it were
understood that this science is not the study of any mysterious entity
called 'the social mind,' nor the mere study of those individual traits
that make men social beings, such as imitation and suggestibility;
but rather the study of the peculiar and characteristic behavior of
the mind of the individual when under the influence of the social
afflatus. Under this influence we do indeed find that he becomes a
different being, and that his mental processes must be formulated by
different laws; and we are convinced that, as thus understood, social
psychology is just as distinct and legitimate a branch of study as is
the psychology of the child or the psychology of sex.

Now, in what ways is the behavior of man as a social being different
from his behavior as an individual? To answer this question in part,
let us examine his behavior in mental epidemics and crazes. I select
these because they illustrate in somewhat extreme form the influence of
the social afflatus.

If, for the sake of comparison, we first consider the normal individual
as such, we find that he is a perceiving, remembering, associating,
judging, reflecting, reasoning being; that he is subject to certain
feelings, emotions, desires and impulses, prompting him to action;
that his action is more or less deliberative, and, when it finally
occurs, is the result of a set of motives determined by the man's
character, which in turn is the outcome of his heredity and education
and his general ability to appreciate and reflect the moral ideals
of the social order to which he belongs. If now we study this man
in respect to his mental development, whether from the savage or
the child, we find that the direction of change has been away from
imitative, impulsive action, towards thought, reflection, deliberation.
He continually makes more use of memory and, anticipating the future,
regulates his action in the light of his past experience. This change
from the imitative and impulsive to the reasoning man accompanies the
development of the higher brain centers, particularly of the cerebral
cortex, upon which depend the all-important functions of memory and
association. As an experiment it is quite possible to reduce this
highly developed reasoning being in a single moment to a condition
resembling his primitive state by means of hypnotism. In hypnosis there
is a temporary paralysis or sleep of the higher brain centers, upon
which depends deliberative, rational action, and, the lower (older)
centers alone being active, the subject becomes a mere ideo-motor
machine acting out every suggestion. In various related states of
automatism, where there is any spontaneity at all, the mentality
and morality of the subject are of a lower type and may be called
reversionary in character, owing, no doubt, to the fact that those
brain centers which represent the most recent acquirements of the race
are temporarily out of the circuit.

If again we study the mind of the child, we find that it presents many
points of likeness to the mind of the hypnotic subject and to the mind
of the primitive man. We learn from biology that the child is to some
extent a recapitulation of the life of the race, passing through in his
individual development the stages of race development. Physiologically
speaking, the higher brain centers and the centers for association,
which are late acquirements of the race, are last developed in
the child. We are therefore not surprised to find that the child,
like the savage and the hypnotic subject, is imitative, impulsive,
non-reflective, incapable of much abstract thought, deliberation or
reasoning, and that he acts with a view to immediate rather than remote
ends.

If now we turn to the behavior of the normal adult man in mental
epidemics and crazes of all kinds, from the Crusades to the Massacre
of St. Bartholomew, from the tulip mania in Holland to the Dewey
welcome in New York City, we observe that his behavior is to some
extent similar to that of the hypnotic subject, and the child, and the
primitive man. The general character of mental action in epidemics
is as follows: Men become imitative beings and their actions are
determined by suggestion from the actions of others. Memory and the
association of ideas are inactive, and there is an inability to reason
and an indisposition towards deliberation and calm reflection. Past
experiences are disregarded, remote consequences are not seen and
behavior is impulsive and spasmodic. Feeling is very strong and every
kind of emotion is apt to be exaggerated. Calm observation is also
lacking and mental images may be mistaken for objective reality, as in
the case of the hallucinations that are frequent in these phenomena.

The moral peculiarities of an epidemic are of a similar kind. Under
the influence of a craze, the moral character of a people suffers a
reversion to a primitive type. In times of epidemic waves the moral
standards of the crowd approach those of the savage. We observe
the exhibition of primitive instincts, such as cruelty, revenge
and blood-thirstiness, together with changeableness, fanaticism,
self-sacrifice and enthusiastic devotion to a leader. All these moral
traits were well illustrated in the Revolution crazes in France
and in the persecution of witches in the sixteenth and seventeenth
centuries. Even in our own times a striking example of the primitive
character of the morality of a people under the influence of social
excitement was seen in the battle-cry of our American sailors in the
recent Spanish war, 'Remember the Maine,' the ethical motive being a
precipitate impulse to seek revenge. An instance like this can not be
explained upon the theory that it represented the actual individual
morality of the sailors participating in the battles, for it was echoed
and apparently endorsed by the press throughout the country and upon
the platform and even in the pulpit. It is hardly conceivable that
an Englishman of noble birth should openly boast of his joy in being
revenged upon an enemy; yet collective England is wild with delight
when 'Majuba Hill is avenged!'

We are thus led apparently to the theory that, for some reason not
yet evident, under the influence of social excitement, something
takes place in the brain of the individual not unlike the action of
hypnotism, by which the higher centers representing the more recent
moral and mental acquirements of the race are temporarily paralyzed,
reducing the subject in a greater or less degree to the condition of
the child and of the primitive man. The observation of certain physical
phenomena which often accompany mental epidemics tends to confirm
this theory and at the same time to suggest a possible explanation.
Epidemics of the more extreme kind are apt to be accompanied by great
muscular excitability, varying all the way from mere extreme mobility,
such as shouting, jumping and throwing the arms, to convulsions like
those of epilepsy. The dancing manias of the fourteenth and fifteenth
centuries furnish the best illustrations of this, although these
phenomena did not equal in intensity the frightful physical convulsions
during the religious revivals in Kentucky at the beginning of this
century. The particular character of these muscular movements is
determined by imitation and suggestion. The movements themselves are
no doubt due to congestion and irritation of the motor centers, or
at least to a rapid overflow of nervous discharges at these centers,
an accompaniment of the excessive emotion which attends all mental
epidemics. In such a condition of the nervous system, thought,
reasoning, memory and association can have little place, or, to
express it physiologically, the unusual excitement in the lower
centers of the brain accompanying excessive emotion may not only find
expression in muscular movements, but may also exercise an inhibitory
or paralyzing effect upon the higher centers, resulting in a kind of
hypnotic condition. Neither is it difficult to understand the presence
of this excessive emotion during mental epidemics or during any purely
social movements, when we remember that war itself is the great
original social movement, which even in this age always takes the form
of a mental epidemic called the war spirit. The emotional effect of
the mere physical congregation of a large number of men, the emotion
increasing with the size of the assemblage, is known to all.

As we glance now at a few of the typical mental epidemics of history,
we shall notice the ever-recurring presence of some or all of the
mental and moral traits that I have pointed out. For illustrations
of these phenomena we may turn indifferently to ancient, medieval or
modern history. They abound at every period.

Very good examples may be found in Hecker's 'Epidemics of the Middle
Ages.' In the Crusades, particularly in the Children's Crusades, we
may observe all the mental, moral and physical peculiarities that
have been mentioned. In the anti-Semitic mania, we see in its history
of criminal horror the dehumanizing effects of the epidemic and the
moral reversion which takes place under the influence of social
excitement. The peculiar physical phenomena which have been referred
to as characterizing epidemic excitement are best illustrated in
the dancing manias of the Middle Ages and in the religious revival.
Although epidemic 'revivals' have occurred in all countries, some of
the best illustrations are seen in America in its early history and
to some extent at the present day. At the time of the elder Edwards,
revivals were accompanied by fainting, falling, tremor and numbness.
In the Kentucky revivals the meetings, called camp meetings, were
held in the open air. The interest in them spread in true epidemic
form. At the height of the excitement, as many as 20,000 people, men,
women and children, were gathered in a single camp at one time. Dr.
Davidson, who writes a history of this revival, says that "the laborer
quitted his task, age snatched his crutch, youth forgot his pastime,
the plough was left in the furrow, business of all kinds was suspended,
bold hunters and sober matrons, young men, maidens and little children
flocked to the common center of attraction." The emotional tension
was very great. A boy perhaps would spring to his feet and begin to
rave, or some over-excited person would utter a piercing shriek, or a
cry of triumph, and this would be the signal for a general hysterical
outbreak, accompanied by many remarkable physical symptoms. Of these
the most common were falling in convulsive spasms, jerking, dancing,
barking like dogs, fainting, crying, singing, praying and cursing.
Sometimes whole companies were seized with uncontrollable laughing
fits, called the holy laugh. At a meeting in East Tennessee, six
hundred began jerking at one time. In many instances sensibility would
be lost and the extremities would be cold, while the face was flushed.
In some places the sufferers were laid out in rows and squares in the
churchyard until they should recover. From a medical point of view we
should call this epidemic chorea, but its more exact physiology I have
already referred to. When closely examined, the phenomena lose a part
at least of their mysterious character. We must remember that religious
emotions are powerful, deep and ancient. The effect, furthermore, is
increased by the general epidemic excitement, by the element of large
and unwonted gatherings of people, by imitation, by the stimulating
music and by the fearfully exciting power of human shrieks and wild
cries and prayers. Such a nervous condition induced in an individual
must have two results: first, the escape of the unusual nervous
excitement in motor channels, giving rise to the choreic movements; and
second, the paralysis of the higher brain centers, resulting in various
hypnotic phenomena and reversionary morality and mentality.

Many of these scenes were repeated in the great revival that swept
New York and the Middle States, beginning in the year 1832. In these
meetings preachers who kept cool and reasoned logically were not
listened to. There was rather a demand for the wild, impetuous,
vociferous, physically impassioned oratory of the rude man. As an
example of reversionary morals in this epidemic, we may notice the fact
mentioned by Albert Rhodes that in response to visions many men put
away their own wives and took others from their neighbors.

From the psychological point of view perhaps the most instructive of
all epidemics is the demonophobia or witchcraft mania which raged from
the end of the fifteenth to the end of the seventeenth centuries. The
savage's fear of demons and of unseen supernatural agencies lurking in
every forest and moor now took hold of the modern world and turned the
people, not into brutes and devils as we figuratively say, but simply
into the original savages from which they came, whose basal instincts
they still carried in their lower nervous centers, to be brought out
under the influence of a social craze. The ecclesiastical authorities,
both Roman and Protestant, led in this homicidal frenzy, while sedate
judges, learned jurors and wise legislators lent their zealous aid. It
spread in true epidemic form all over the Continent and into England
and Scotland, even to America. Distinguished jurists declared that
ordinary methods of trial should not be used for this offence, for so
difficult is it to bring proof of the crime of witchcraft, that out of
a million of witches not one could be convicted if the usual course
of justice were followed. One contemporary of undoubted authority
wrote that he saw a list of three thousand witches that had been
put to death during the time of the Long Parliament alone. In this
reign of demonophobia the psychological phenomena of the craze are
well illustrated. The exciting cause was a widespread contagious and
epidemic fear. The result was a recrudescence of the barbaric instincts
of cruelty, torture and homicide, accompanied by a loss not merely of
reasoning power, but apparently of common sense, so that intelligent
men seemed to believe that old women blasted the crops in the fields
and the offspring of animals, and raised storms and whirlwinds. The
cruelty characteristic of the savage is again noticed in this case.
In the witchcraft persecutions, the victims were commonly weak women,
particularly the more helpless old and young, while the character of
the inflictions was such as is peculiar to primitive people, viz.,
torture and burning alive. The perfidy of the savage is also noticed,
as in innumerable instances the victims were led to believe that they
would be spared if they made a confession, and were then put to death.
To elude a legal requirement that torture should not be repeated, the
most horrible tortures were 'continued' from day to day.

The psychology of crazes is clearly seen in certain of its aspects
in the homicidal manias that have swept over communities or whole
countries at frequent intervals in the world's history. The homicidal
impulse itself is one of the most primitive and basal of all impulses.
The reason for this is apparent. The history of man has been a history
of warfare and of struggle for existence. It has been man against man,
tribe against tribe, nation against nation. Habits like these are not
quickly unlearned, and reversion to them in times of social disturbance
is not strange. In the massacre of St. Bartholomew we have a typical
instance of the homicidal mania. The necessary conditions were, first,
great emotional excitement caused by religious fanaticism acting as
an inhibitory agent upon the higher brain centers and allowing the
primitive impulses to act unchecked; second, the removal of external
and customary restraints, effected in this case by the royal decree;
and third, the mental effects of imitation and suggestion. These
conditions being all supplied, the French people resolved themselves
speedily into assassins and cut-throats, and enjoyed a homicidal
debauch. Begun in Paris, the massacre spread in true epidemic form
throughout France, until fifteen or twenty thousand people had perished.

These homicidal manias have, of course, been very frequent in history.
The decivilizing influence of the craze is, however, most perfectly
illustrated in the various scenes of the French Revolution. Here the
overturning of the social and religious order itself acted in part
as the unsettling and emotionally exciting cause. The usual results
followed. The effect of social excitement in paralyzing the intellect
was shown in this case in the wholesale and useless destruction of
women and children. Furthermore, this reversion to the manners of the
savage carries with it its appropriate mood. The slaughterers are not
like demons, as we imagine demons to be, but rather like thoughtless
children. There is merriment and much gayety, and there is dancing and
singing around the corpses, and seats are arranged for the ladies, who
are eager to enjoy the spectacle; and finally the victims are made to
pass through a double row of executioners, who carve them into pieces
gradually, so that all can saturate themselves with the sight of the
bloodshed.

Although in some cases wars may be coolly planned by the people's
leaders for personal or political reasons or for purposes of national
conquest, still they all depend for their successful issue upon the
homicidal impulse in the masses of people. This is called the war
spirit and is always of an epidemic character. It may have any degree
of ferocity or mildness. It has a tendency to be periodic, so that
if it has slumbered for a considerable period a very slight cause is
sufficient to awaken it. A mere boundary line in Venezuela, in which
this country had but a remote interest, was sufficient a few years ago
to excite this war spirit in a milder form, when a curious craze for a
war with Great Britain flowed like a wave across this country.

Any war will furnish instructive material to the student of social
psychology. In the late Spanish-American war, for instance, we all
felt the war spirit which flowed in epidemic form across the country
and engulfed it. The first motive of the war, the altruistic desire
to free an oppressed people, was of the ideal glittering kind, well
fitted to excite the emotions of the masses. A dramatic event further
fans this emotional flame, and at once the aggregate personality of
the nation is in a condition of automatism, where primitive instincts,
such as revenge and lust for the paraphernalia of war, are no longer
checked by the more lately acquired moral principles. Congressmen,
editors, members of peace societies, ministers of the gospel, forget
their long and patient efforts to establish means for settling national
differences by arbitration and join lustily in the war cry, and the
psychologically curious spectacle is presented of a great nation,
priding itself as a leader in the world's morals, giving to the appeal
of a weaker nation for the arbitration of a dispute the answer of
shot and shell. Although the motive of blood for blood is a moral
motive belonging to a bygone age and in individual ethics has long
been outgrown, yet collectively, under the influence of the war craze,
we revert to it, and it is shamelessly proclaimed from platform and
editorial room and vigorously applauded by the people. We have seen
that cruelty and the persecution of the weak by the strong were among
the reversionary symptoms of the social epidemic in many instances.
We may notice curiously enough a trace of these qualities here, where
the fact that our enemy was a greatly inferior power does not detract
in our eyes from the brilliancy of our victories, though in the ethics
of the individual such a circumstance would put us to shame. In all
this we proceed strictly in accordance with international law, but
international law itself is only international custom and is the
mere expression of the wonted behavior of the aggregate personality,
particularly in times of war. As such it does not represent the highest
ethical development of man, but that lower stage of development to
which he reverts in times of social excitement. From this point of view
it is possible to understand why international ethics is so far behind
individual ethics. Personal disputes were once settled by brute force
as international disputes are now settled. There is no reason to doubt
that the latter will, somewhat later in the history of civilization, be
settled by courts of arbitration and enforced by a system of police as
the former now are.

The considerations now before us show the futility of peace congresses
in that part of their work which contemplates the enforced substitution
of arbitration for war. Peace congresses are not social movements. They
spring from the efforts of individual men, leaders in social reform.
They belong to the upward ethical movements led by individuals, the
slow, painful climbing towards higher moral and intellectual standards.
These congresses may meet and discuss arbitration and perfect an
international program, but they labor in vain, for they forget that
social man has a double personality and that the personality that meets
and deliberates in the peace congress is not the personality that,
under the influence of the war craze, thrills with emotion and acts
from ancient and deep rooted impulses and motives. When the war spirit
sweeps over a country the social personality passes into a condition
not unlike that of hypnosis and is ruled by a different set of moral
principles. It should not be understood from this that peace congresses
are useless. They are a part of an educative system whose influence
in the end will be strong enough to react upon the secondary social
personality and determine its behavior.

Among crazes of a different kind, we may notice financial crazes as
an interesting type, falling under the same laws as those mentioned.
Both in panics and in speculative manias we observe again a species
of hypnotization. In the case of the latter the ordinary business
shrewdness which characterizes the dealings of the individual in a
normal state and which depends upon the activity of late developed
association tracts in the brain, is to a large extent lost. The memory
is impaired and what in general we may call prudence is lacking.

The psychology of the speculative mania is very simple. There is first,
greed, furnishing the necessary emotional excitement; then imitation;
then precipitate, unreasoning action. In the panic, the psychological
sequence is the same, except that fear takes the place of greed. The
stampede among animals may be taken as the type of all panics. It is a
reflex phenomenon consisting merely of contagious fear and precipitate,
unintelligent flight. Fear and flight constitute a most primitive form
of mental action, equalled in primitive character only by that other
form whose survival we have seen illustrated in wars and homicidal
manias, viz., anger and combat. Although the individual has long
outgrown these simple reflexes, yet in social excitement he reverts to
them. The recrudescence of the first of these two forms is seen in the
case of panics in theatres and burning buildings, where social fear is
followed by unintelligent flight, there being a temporary paralysis
of reason, prudence, the power of choosing means to ends, respect for
women and consideration for the weak and feeble.

The limits of this paper permit me only to refer to other forms of the
craze illustrating the same laws. In fads and fashions of all kinds,
the behavior of the social personality is different only in degree
from that already described in the more serious epidemics. The law
of imitation is the same, but there is less excitement and emotional
disturbance and consequently a lesser paralysis of the higher mental
faculties and a lesser return to barbaric impulses. Whereas the others
may be called forms of social paranoia, these may be called forms of
social monomania. A single idea fills the public mind, and as a result
this idea is unduly exalted as to its importance and worth. The higher
mental powers are paralyzed only so far as that there is a perverted
judgment as to the relative importance of things and consequently
a more or less distorted view of the world and its values. Perhaps
the simplest form of this craze is seen in the epidemic character of
children's games. At different times of the season different games
completely fill the social consciousness of the child-world, so
that for the moment there is no interest in any other game. New and
interesting sports, such, for instance, as golf, often fill the social
adult consciousness in the same way. Then there are social and literary
fads, crazes in musical airs, fashions in dress, furniture, houses and
carriages, without number. Crazes of all kinds have found a prolific
soil in America. The American mind is highly suggestible. One fad after
another rages over the country and in some cases reduces the aggregate
mind to a condition of idiocy. The Dewey craze in New York City last
year is an illustration of this. Nothing but a sort of hypnotic
distortion of intellectual vision could cause grown men to stand in
line for an hour in order that they might sit for an instant in the
chair in which the hero sat during the review, or to fight for shreds
of the flags and awnings that decorated the platform.

Sporadic social reform movements take the form of crazes and
illustrate the same laws. One recalls the Woman's Crusade in 1873,
the result not of a rational plan but of imitation, and the Granger
movement and the Farmers' Alliance and the greenback craze and the
silver craze and many others.

Since Aristotle we have been told that man is a social animal and that
to study him as he really is we must not isolate him from society. The
evident truth of this may lead us to forget that it is but a half truth
and the uncritical acceptance of it will lead us wholly astray in our
sociological study. The inference which we seem compelled to draw from
studies in social psychology is that social man is, in his ethical
and intellectual development, many stages behind the individual man.
The progress of civilization is a slow, painful, upward climbing, in
which individuals are the thinkers, the planners, the promoters and
the leaders. The mind of society, on the other hand, using the phrase
in the sense defined, is an imitative, unreflective, half-hypnotic,
half-barbaric mind, always acting as a drag upon the upward and forward
movement, and, in times of crazes, epidemics and social cataclysms,
gaining temporary dominance and causing disastrous relapses to a lower
plane of civilization.




SOME PHASES OF THE EARTH'S DEVELOPMENT IN THE LIGHT OF RECENT CHEMICAL
RESEARCH.

BY PROFESSOR EDWARD RENOUF.

JOHNS HOPKINS UNIVERSITY.


In the following pages an effort is made to apply some of the results
of recent chemical research to the earlier history of the earth. It is
hoped that the main facts brought out may be readily grasped by those
who have never studied chemistry, and that each link in the chain of
events will be made evident to those who have mastered the rudiments of
this science.

Chemical action involves change of composition. Substances more or
less complex may be broken down into simpler substances, or from
several simpler substances a complex substance may be built up. From
the complex ore of copper found in nature the simple element copper is
obtained. From the elements sulphur and oxygen and the simple substance
water the complex sulphuric acid is built up. Within the last few
years the high temperature of the electric arc--the heat generated
by a powerful electric current playing between two carbon poles--has
been employed in bringing about chemical changes which do not occur
at ordinary temperatures nor at those obtainable by burning fuel. The
electric furnace is used industrially to make calcium carbide from lime
and coke, carbon silicide (carborundum) from coke and sand, and the
metal aluminum from its compounds.

Chemical changes at high temperatures have long been an object of
research, but it was not until the introduction of the electric furnace
that it was possible to command temperatures high enough to make
exhaustive studies. In the last few years several chemists, especially
Moissan, of Paris, and his pupils, have done systematic work with the
aid of the arc furnace. The furnace used in the laboratory for high
temperature work is a small and simple apparatus; Moissan's furnace is
a block of quick lime a little longer and wider than a page of this
magazine and about three inches thick. A rectangular cavity is cut
on the upper surface of this block. A similar block forms the cover.
In opposite grooves between the top and bottom piece are placed the
carbons, such as are used in ordinary arc lights. The arc plays across
the cavity in such a manner that the substance to be heated is not
brought into the arc itself, which is vaporized carbon, but below it.
The cavity thus represents a tiny reverberatory furnace; the arc heats
the roof and sides to an intense heat, which is radiated on the open
dish or closed crucible or tube containing the substance heated. This
is the simplest form of laboratory furnace. Various modifications
are used, but in all the size is small and the arrangement simple. A
powerful arc plays in the smallest possible cavity with the object
of attaining the maximum of temperature, expense and duration of
material being secondary considerations. Lime and magnesia are the
best materials, because they are at the same time the most refractory
substances available and are poor conductors of heat. A furnace top
one and one half inches thick may be heated by so powerful an arc that
the melted quick lime drips from the inner surface, while the outer
surface is scarcely warm to the touch of the hand. Moissan has utilized
in these little furnaces currents of electricity of varied strength,
the lowest being that given by a four horse-power dynamo, the highest
that generated by three hundred horse power. The highest temperatures
obtained were about 3,500 deg. centigrade (6,300 deg. Fahrenheit),
with the heat constantly increasing; the limit to the obtainable
temperature--as far as the experimental evidence showed--was merely the
lack of any known substance refractory enough to bear the heat; for at
the temperature mentioned quick lime and magnesia not only melt but are
changed into gases, so that the furnace was filled with the vapors of
its own material.

The effect of the heat on single substances is very interesting.
Refractory metals, such as iron, manganese, uranium, platinum, melt
rapidly and then become gaseous; the most refractory non-metallic
elements, silicon, boron, carbon, are also changed into the gaseous
form. Very refractory compounds are broken down into simpler ones.
Magnesium pyrophosphate yields phosphorus, magnesium oxide and oxygen.
Asbestos--a magnesium silicate--gives as chief product magnesium
silicide; the other substances formed being silicon, silicon dioxide
and a little magnesium oxide.

Such are the astounding changes wrought by simple heat upon those
substances which we are accustomed to regard as infusible. It must
be remembered that the range of temperature which chemists employ in
ordinary laboratory work is not very great and that the conditions of
work in the laboratory and of nature's work on the earth's surface at
the present day favor the formation of two classes of compounds--the
oxides and their hydrates. Although air is a mixture consisting mainly
of four parts of nitrogen and one of oxygen, atmospheric nitrogen is
generally inert at ordinary temperatures, and it is the oxygen of the
air which is the more important factor in the growth of living things
and in changes in lifeless matter. Water, a compound of oxygen and
hydrogen, is present everywhere, either in the liquid form or as vapor
in the air; even in the flame of the hottest fires there is water vapor
in abundance, since water is one of the chief products of combustion
of most forms of fuel. Is it a wonder that under such conditions we
find the earth's crust to contain the elements chiefly compounded
with oxygen? Was this always so? Are we justified in supposing that
conditions may have prevailed--nay, must have prevailed--in former
times on the earth's surface, which gave to other elements as important
or more important functions than to oxygen? The answer to these
questions must be sought in the results of the chemistry of high
temperatures.

First let us consider the conditions of existence of the omnipresent
water. Water begins to break down into its components, hydrogen and
oxygen, at 934 deg. centigrade; at 2,500 deg. centigrade (4,500 deg.
Fahrenheit) the decomposition is complete. In other words, water vapor
cannot exist at temperatures above 2,500 deg., but the hydrogen and
oxygen exist in the free state.

Astronomers tell us that refractory elements like iron, silicon and
carbon, perhaps disassociated into still simpler substances, are
present as vapor in the atmosphere of the sun and that many others of
our well-known elements, including hydrogen, are also present in this
glowing atmosphere, while the heat of the sun's surface and that of
the hotter stars is vastly higher than that of the electric furnace.
Geologists believe that the evidence at their disposal points to a
similar period of great heat in the early history of the earth. It
may be considered, then, that temperatures higher than those of the
electric furnace prevailed in former times on the earth's surface.

Let us now return to the study of the results obtained with the
electric furnace. The following reactions are especially important. If
metals, or refractory non-metals, or metallic or non-metallic oxides,
or complex silicates, are heated to the higher temperatures in contact
with carbon, boron, silicon or compounds of these three elements with
oxygen, the result generally is that very refractory carbides, borides
or silicides of the metals or non-metals are formed. In other words,
those complex substances which form the chief constituents of the
outer crust of the earth at the present day are decomposed at high
temperatures, and simple compounds of two elements--so-called binary
compounds--are formed. Four classes of these binary substances seem to
be especially stable at high heat--the carbides, borides, silicides and
oxides; but the oxygen of the metallic oxides tends to pass off as an
oxide of carbon, if carbon be present.

At somewhat lower temperatures nitrogen is very active and the nitrides
of many metals are readily formed. An excellent example is shown by
heating a mixture of carbon and of an oxide of titanium (titanic acid).
When heated by a feeble current the acid is simply reduced, forming
a lower oxide of titanium; with a more powerful current the mass is
completely changed into the nitride of titanium, the nitrogen coming
from the air; with a very powerful current this is changed into pure
carbide, as the nitride cannot exist at the higher temperature, and the
nitrogen escapes, carbon taking its place. At still higher temperatures
hydrogen acts on many metals, forming hydrides. The carbides and other
compounds of some metals are not stable at high temperatures, being
reduced by gaseous carbon to the free metals, which remain then in the
gaseous form.

At that period of the earth's history when the temperature was as high
as that easily obtained in the electric furnace, we have the sanction
of geologists for picturing the earth's surface as an ocean of molten
matter surrounded by a glowing atmosphere. This molten surface must
have consisted of binary compounds such as those mentioned above, and
probably contained some refractory elements, metals and non-metals,
in the free state. The atmosphere contained free hydrogen, oxygen
and nitrogen, gaseous binary compounds like the oxides of carbon,
metals in the gaseous form and many non-metallic elements like sulphur
and chlorine. In the atmospheric region furthest removed from the
molten surface violent chemical reactions occurred between the heated
elements, forming compounds which were again dissipated into their
elements by the heat given off in the act of formation or radiated from
the glowing surface below.

Under the enormous pressure of this atmosphere the liquid surface of
the earth solidified at very high temperature. Whether the earth's
mass solidified from the centre outward or by forming a solid crust
over a liquid interior, is a question to be decided by physicists and
geologists. We will consider only the outer crust and the atmosphere.
As the surface and the atmosphere above it gradually cooled, the
formation of nitrides, and later of hydrides, sulphides and chlorides,
occurred.

The conditions now attained may have been fairly stable as long as
the temperature of the surface and lower regions of the atmosphere
were high enough to prevent the union of the atmospheric oxygen and
hydrogen, or to decompose the water forming in the outer regions of
the atmosphere. As soon, however, as by further cooling, water came
into contact with the earth's surface, very violent reactions occurred,
which were supplemented by other equally violent reactions when the
cooling process permitted the formation of the ordinary mineral acids.

The reactions of water and of acids on many of the binary compounds
are so important in determining the present composition of the
earth's crust that they must be considered in detail. The carbides,
nitrides, chlorides, sulphides and hydrides of most elements, and some
silicides, are decomposed by water, or else by dilute acids, forming
the hydrogen compounds of carbon, nitrogen, chlorine, sulphur and
silicon respectively, and the oxide or hydroxide of the other element.
Thus calcium carbide and water give calcium hydroxide and acetylene,
a hydro-carbon. Aluminum carbide yields alumina and methane (marsh
gas), another hydro-carbon, the chief constituent of 'natural gas.'
Other carbides yield crude petroleum. The nitrides yield ammonia, which
is the hydrogen composed of nitrogen. The chlorides give hydrochloric
acid, the sulphides sulphuretted hydrogen and the silicides the
hydrogen silicide. The metallic hydrides yield free hydrogen.

The violence and the magnitude of some of these reactions almost baffle
the imagination. Let the reader drop a piece of calcium carbide as
large as a small marble into a little water in a cup; there is a rapid
action, a gas (acetylene) is given off, which burns with a smoky flame
if a lighted match is held over the cup. (The experiment should be
tried in the open air.) So much heat is generated in the reaction that
the cup becomes hot. Nearly four per cent. of the earth's outer crust
is calcium; all this was at this period of the earth's history in the
form of carbide. Imagine all the vast limestone mountain ranges of
the present day as carbide, and try to realize the effect when water
fell on any considerable area. The heat generated would be so enormous
that in a moment the acetylene would ignite and burn, forming oxides
of carbon and water vapor, which would in turn decompose, throwing the
jets of glowing hydrogen and oxygen vast distances into the atmosphere,
there to cool and reunite to water. The decomposition of other
carbides, of the hydrides and silicides, as well as the formation of
hydroxides by the action of the lighter metals on water, would produce
similar phenomena, as the substances formed are combustible gases, or
liquids or solids easily volatilized. This is no wild fantasy, but
a conservative statement. Similar reactions are taking place at the
present day in those stars whose cooling process has advanced far
enough; a case in point is that of the so-called 'temporary stars.'

Extremely violent reactions are taking place constantly in the
atmosphere of the sun. The sun's chromosphere, or outer layer of its
atmosphere, consists mainly of hydrogen, and jets of glowing hydrogen
are thrown to great heights above the chromosphere; these jets or
'prominences' have been frequently observed to have a height of 100,000
miles, and prominences of more than double this height are reported
by observers. The most conservative estimates assume temperatures of
the sun's surface so enormous that that of the electric furnace is
insignificant in comparison, and we can have no conception of the
chemical changes occurring under such conditions. Whether one believes,
with Lockyer, that the chemical 'elements' are disassociated by the
sun's heat into simpler substances or not, it is clear that very
violent chemical reactions are in progress, and if we realize that
the known chemical reactions increase in intensity with increase in
temperature, it does not seem strange that at the sun's temperature the
reactions occurring should cause disturbances like those observed.

Returning to the earth, let us consider the products of these violent
reactions. The hydrogen and hydrides of boron, silicon, sulphur and
carbon, combined with the oxygen of the atmosphere, forming water and
boric, silicic, sulphurous and carbonic acids, which in turn acted on
the metallic oxides and hydroxides, forming sulphites, carbonates,
borates and simple and complex silicates; some quickly, some slowly,
some at low temperatures and atmospheric pressure, others at high
temperatures in liquid or semi-liquid condition and under the pressure
of rock masses above. To determine the relative age of existing rock
layers, or the mode of their formation, whether by eruptive action, by
surface heat, by deposition of finely divided material under water,
or by metamorphic changes of the cooled silicate under subsequent
action of water, pressure and heat, is the province of the geologist.
The present writer refrains from an opinion whether any of the first
formed solid crust could or could not survive to the present day in
its primary form, considering the exposure to water, acids, heat and
pressure which it suffered.

Yet an idea may be formed of the condition of the earth's surface when
it had cooled so far that the more violent chemical action had ceased.
It consisted chiefly of silicates, simple and complex; of some of
the original binary compounds, which are scarce affected by water or
acids, such as the silicide of carbon (carborundum), of stable oxides,
chlorides and sulphides, with other compounds in smaller proportion,
and free elements in greater proportion than at the present day.
Everywhere, from crevices in the surface, hydrocarbons, phosphoretted
hydrogen (phosphine) and ammonia were issuing as gases; the atmosphere
was heavy with these gases and with carbon dioxide.

No scientific observations thus far show _how_ or from what definite
compounds plant life or animal life was first evolved from lifeless
matter; but it is certain that the materials were much more abundant
and the conditions more favorable at the period when it _was_ evolved
than at the present day. An ocean much warmer and less saline than now,
a damp atmosphere like that of a hothouse, an abundance of plant food
and a choice of raw material, were at hand. The chief foods required
for plant life are nitrogen in the form of ammonia or nitrates, carbon
dioxide, phosphorus as phosphates, sulphates of lime, of magnesia
and of the alkalies, and water. As to the raw material for the first
formation of the living cell, it is impossible to say what compounds
of carbon were employed; suffice it to note that the known simple
and complex binary compounds of carbon were there ready for use; the
hydrocarbons, carbon monoxide and carbon dioxide were oozing from the
earth's surface, from the ocean floor as well as from the land, or
hanging heavy in the air above it. If warmth or increased pressure
were desiderata, an ocean warm to its greatest depths could afford
any pressure required. From the decomposition of the nitrides and
phosphides below the surface, ammonia and phosphine were escaping into
the ocean and into the air. The conditions then during long periods
of time were especially favorable for marine life, and as sand and
mud accumulated on the rocky surface of the earth, for land plants;
the absence of a thick soil being more than compensated for by the
abundance of plant food, notably of carbon dioxide and ammonia.

The statement may be found in excellent modern text-books of chemistry
that ammonia is always formed by the decomposition of plants and
animals, accompanied by the further statement that ammonia is a
requisite for plant food. No plants--no ammonia; no ammonia--no plants.
If this were true, the beginning of plant life would indeed have been
a struggle for existence; that it is not true is shown above. This
decomposition of nitrides has ceased practically on the actual surface
of the earth at the present day because the nitrides have all been
decomposed; yet it may be mentioned that specimens of rock freshly
quarried in Sweden were recently found to give off ammonia when wet
with water, showing the presence of nitrides. Below the actual earth's
surface it is probable that nitrides still exist in large quantity,
for ammonia is one of the constituents of volcanic gases; to believe
that volcanic ammonia is a product of plant or animal decomposition is
difficult; to suppose it formed by the action of steam on nitrides in
the earth's interior is simple.

Much the same may be said of the presence of carbides. While they no
longer exist on the surface, there is no doubt of their existence
in the interior of the earth, and the volcanic gases contain their
decomposition products. In this connection the theory--first put
forward by Mendeleeff and since supported by Moissan--of the origin
of petroleum, may be mentioned. These writers favor the hypothesis
that it was formed by the decomposition of carbides by water under
pressure; and while the evidence at hand perhaps favors the belief
that the petroleum of the more important oil fields owes its origin to
decomposition of the lower forms of marine animal life, yet there can
be no doubt that petroleum may be formed by carbide decomposition, and
it seems probable that natural gas is in part at least a result of the
same action.




A PRELIMINARY ACCOUNT OF THE SOLAR ECLIPSE OF MAY 28, 1900, AS OBSERVED
BY THE SMITHSONIAN EXPEDITION.

BY DR. S. P. LANGLEY,

SMITHSONIAN INSTITUTION.


Partly in deference to the report of the United States Weather Bureau,
from which it appeared that the chance of a fair eastern sky on the
morning of the eclipse was about 8 to 1, and after examination by Mr.
Abbot of many stations in North Carolina, Wadesboro, of that State, was
selected early in April as the site of the Smithsonian observations.
The advantages of Wadesboro being also recognized by Professor Young,
of Princeton, Professor Hale, of Yerkes Observatory, and the Rev. J.
M. Bacon, of the British Astronomical Association, it came about that
four large observing parties, besides several smaller ones and numerous
excursionists from the surrounding country, were all joined to produce
at Wadesboro one of the largest company of eclipse observers ever
assembled for scientific purposes. It is a matter for congratulation
that the sky at Wadesboro upon the day of the eclipse was cloudless
and clearer than the average, so that the efforts of the observing
forces were not thwarted by any circumstances beyond their control. The
provisions of the Mayor and authorities of Wadesboro for preventing
intrusion before and during the eclipse, and thus securing an
undisturbed field of operations, deserve especial recognition. Further
than this, the many acts of courtesy and hospitality to the visiting
astronomers on the part of the townspeople will long be remembered by
the recipients.

The Smithsonian party proper consisted of thirteen observers,
and included Mr. Langley, Mr. Abbot, aid acting in charge of the
Smithsonian astrophysical observatory; Mr. Smillie, in charge of
photography; Mr. Putnam, of the United States Coast Survey; Mr. Fowle,
Mr. Mendenhall, Mr. Child, Mr. Draper, Mr. Gill, Mr. Kramer and Mr.
Smith. Included with these, the Rev. Father Searle and the Rev. Father
Woodman gave most valuable assistance. Mr. Hoxie, of Port Royal, S. C.,
and Mr. Little, of Wadesboro, rendered valued assistance to Mr. Putnam
during totality.

Professor Hale, of the Yerkes Observatory, was a member of the party,
while still in general charge of the Yerkes expedition, and his
counsel and aid were of the greatest service. Mr. Clayton, of Blue
Hill Meteorological Station, occupied a part of the grounds of the
Smithsonian party.

The main object of investigation was, of course, the corona, and of
this, (first) a photographic and visual study of its structure; with,
(second) a determination by the bolometer whether appreciable heat
reaches us from it, and, if possible, an examination of the form of its
spectrum energy curve.

The writer had been particularly struck, when observing the eclipse
of 1878 on Pike's Peak, by the remarkable definiteness of filamentary
structure close to the sun's limb, and had never found in any
photographs, not even in the excellent ones of Campbell taken at the
Indian eclipse of 1898, anything approaching what he saw in the few
seconds which he was able to devote to visual observations at the
height of fourteen thousand feet. His wish to examine this inner
coronal region with a more powerful photographic telescope than any
heretofore used upon it, was gratified by the most valued loan by
Prof. E. C. Pickering of the new 12-inch achromatic lens of 135 feet
focus, just obtained for the Harvard College Observatory. This lens,
furnishing a focal image of more than 15 inches diameter, was mounted
so as to give a horizontal beam from a coelostat clock-driven mirror by
Brashear, of 18 inches aperture, and used with 30-inch square plates.
To supplement this great instrument, a 5-inch lens of 38-feet focus,
loaned by Professor Young, was pointed directly at the sun. This
formed images upon 11 x 14 plates moved in the focus of the lens by a
water clock. Specially equatorially mounted lenses of 6, 4 and 3-inch
aperture, driven by clock work, were provided for the study of the
outer corona, and the search for possible intra-mercurial planets.

For the bolometric work, the massive siderostat with its 17-inch
mirror, and a large part of the delicate adjuncts employed at the
Smithsonian Institution in recent years, to investigate the sun's
spectrum, was transported to Wadesboro. The excessively sensitive
galvanometer reached camp without injury even to its suspending fibre,
a thread of quartz crystal 1-15,000 inch in diameter.

Besides these two chief aims (the photography and bolometry of the
inner corona), several other pieces of work were undertaken, including
the automatic reproduction of the 'flash spectrum' by means of an
objective prism with the 135-foot lens, the photographic study of the
outer coronal region, including provision for recognizing possible
intra-mercurial planets, already alluded to, visual and photographic
observations of times of contact, and sketches of the corona, both from
telescopic and naked-eye observations.

The assignment of the observers was as follows: Mr. Langley, in general
charge of the expedition, observed with the same 5-inch telescope used
by him on Pike's Peak in 1878, which was most kindly lent for this
special comparison by Professor Brown, of the United States Naval
Observatory; C. G. Abbot, aid acting in immediate charge, assigned
with C. E. Mendenhall to the bolometer; T. W. Smillie, having general
direction of the photographic work, made exposures at the 135-foot
telescope; F. E. Fowle, Jr., assigned to the 38-foot telescope; Father
Searle, directing the assembled telescopes for the outer coronal
region, and for intra-mercurial planets, assisted by P. A. Draper and
C. W. B. Smith, exposed two cameras of 3-inch aperture and 11 feet
focus, and two of 4-1/2-inch aperture and 3-1/2 feet focus, all four
of these telescopes being mounted on a single polar axis driven by an
excellent clock; De Lancey Gill, assisting Mr. Smillie, removed the
flash spectrum objective prism at second contact, and made a single
long exposure with a 6-inch photographic lens of 7-1/2 feet focus
equatorially mounted; Assistant G. R. Putnam, who, by the kindness of
the superintendent of the United States Coast Survey, was detailed
for latitude,[C] longitude[D] and time observations, also observed
contacts, directed the striking of signals by Mr. Little, and rendered
other valuable services. Mr. Putnam was assisted in recording contacts
by Mr. Hoxie. R. C. Child, observing with a 6-inch telescope of 7-1/2
feet focus, made sketches with special reference to inner coronal
detail, and was in addition charged with all electrical circuits for
chronograph and automatic photographic apparatus. Father Woodman, with
3-1/2-inch telescope, observed contacts and made sketches.

    [C] 34 deg., 57', 52" N.

    [D] 5h., 20m., 17.8s. W.

The first detachment, consisting of Messrs. Abbot, Fowle, Kramer
(instrument maker) and Smith (carpenter), reached Wadesboro May 4th,
and were soon joined by Messrs. Draper and Putnam. The latter returned
to Washington after a short but satisfactory latitude and longitude
campaign, reaching Wadesboro again just before the eclipse. Other
members of the party reached camp on and after the middle of the month.
The first comers found a very satisfactory shed already erected and
piers begun. Not a day passed from the time of the arrival of the
apparatus, May 7th, to the day before the eclipse, that was not fully
occupied in perfecting the arrangements.

The most striking portion of the installation was the line beginning at
the northwest pier, with its equatorial and coelostat, continued from
thence south of east by the two great diverging tubes of the 135-foot
telescope and spectroscope. These tubes were covered with white canvas,
presenting the appearance of two immensely prolonged 'A' tents, ending
beyond the photographic house, where the 38-foot telescope tube pointed
east and upward at an angle of 42 deg. with the horizon. When the
equatorial, with its large special conical tube camera, with all this
long-branching extent of white canvas ending in the uplifted tube of
the 38-foot telescope, was seen in the light of the moon, the extensive
field with these preparations, exhibited a still more picturesque scene
than by day.

Less imposing, and perhaps more ungainly was the combination of four
great cameras under the main shed, designed to search for new planets
and to depict the outer corona. These might well be described as like
a cabin and outbuilding, mounted on a polar axis, yet, despite their
awkward proportions, they were made to follow very accurately.

The morning of the eclipse dawned cloudless and very fairly clear. Deep
blue sky, such as the writer had seen on Pike's Peak, of course, is not
among the ordinary possibilities of an eclipse, but the milkiness of
the blue was less pronounced than is usual in the summer season, and
all felt that the seeing promised well.

At fifteen minutes before totality a series of rapid strokes on the
bell called every one to his post, and one minute before the expected
contact five strokes were given as a final warning. Coincidentally
with the actual observation of the second contact by Mr. Putnam, the
first two strokes upon the bell sounded, and the work began. After
82 seconds (the duration of totality from the Nautical Almanac was
92 seconds), three strokes were given as a signal to stop the long
photographic exposures. Scarcely more than five seconds after this the
sun's crescent reappeared. The duration of totality, as observed by Mr.
Putnam, was approximately 88 seconds.

To visual observers the sky was notably not a dark one. No second
magnitude stars were observed with the naked eye, and most of
the on-lookers saw only Mercury conspicuously, though Venus was
distinguished at a low altitude and Capella also was seen. So high a
degree of sky illumination can not but have operated unfavorably in the
study of the outer corona or in the search for intra-mercurial planets,
and this is to be remembered in connection with what follows.


BEFORE TOTALITY.

A deepened color in the sky, a fall of temperature and a rising breeze
were distinctly noticeable. No change in direction of the wind was
noted. Shadow bands were seen, but those who attempted to measure their
velocity found them too rapid and flickering for any great exactness
in this determination. There was tolerable unanimity among independent
observers as to their size and distance apart (about five inches),
though some thought this less as totality approached.

It was noticed that the birds grew silent just before and during
totality, but true to their nature, the English sparrows were last to
be still and first to begin their discussion of the eclipse, after the
return of light.


DURING TOTALITY.

The attention of all visual observers was at once caught by the
equatorial streamers. Father Woodman's comparison of the appearance of
a structure of mother of pearl was generally recognized as good, but
different observers differed on the color estimate. A yellowish green
tinge was noted by the artist of the party, Mr. Child, while to others
the light was straw  or golden.

The general coronal form to the naked eye was nearly that of the
small annexed photograph, which, though taken by one of the smaller
objectives, gives a good view of the relative intensities. The same
extensions of the equatorial corona could be followed by the naked eye
from 3 to 3-1/2 solar diameters.

The visual telescopic observations of the writer gave little indication
of the finely divided structure of the inner corona which he had
noticed at Pike's Peak. Structure, to be sure, was evident, but not
in such minute subdivision as had then been seen, and though one
remarkable prominence as well as several smaller ones was visible, the
coronal streamers did not give to the writer the impression of being
connected with these prominences, though the relationship of some of
them to the solar poles was abundantly manifest.


AFTER TOTALITY. _Results._

Comparing notes after totality, all observers reported a successful
carrying out of the programme. The greatest interest centers in the
direct coronal negatives taken with the 135-foot telescope. Mr. Smillie
exposed six 30 x 30 plates during totality, with times ranging from one
half a second to sixteen seconds, and three others were exposed by him
immediately after the third contact.

At this writing only a part of the negatives taken have been developed.
Their general quality may be inferred from the examples here given,
after due allowance for the great loss suffered by translation onto
paper even with the best care.

[Illustration: FIG. 1. GENERAL VIEW OF THE CORONA. TAKEN WITH 6 INCH
LENS OF 7-1/2 FEET FOCUS. 82 SECONDS EXPOSURE.]

Fig. 1 is a view taken with one of the smaller objectives (6 inches),
given here to afford the reader an idea of the general disposition of
the coronal light. The upper part is the vertex in the inverted field.

[Illustration: FIG. 2. PROMINENCES ON SOUTHWEST LIMB OF SUN. TAKEN WITH
12 INCH LENS OF 135 FEET FOCUS. 8 SECONDS EXPOSURE.]

Fig. 2 is a portion of one of the great 15-inch circular images
obtained with the 135-foot focus telescope. It was obtained in the
great disc in the last exposure during totality of 8 seconds, showing
one of the principal prominences then on the sun's disc, with the
disposition of the lower filaments near it.

[Illustration: FIG. 3. NORTH POLAR CORONAL STREAMERS. TAKEN WITH 15
INCH LENS OF 135 FEET FOCUS. EXPOSURE 16 SECONDS.]

Fig. 3 is a portion of one of the same set of plates, but taken with
a 16-second exposure. The part near the sun has, of course, been
intentionally over-exposed, in order to better exhibit the remarkable
polar streamers, extending here to a distance of about six minutes from
the sun, but seen still further in Mr. Child's telescopic drawing (not
given.)

[Illustration: FIG. 4. DARK ROOM AND TUBES OF 135 FOOT AND 38 FOOT
TELESCOPES. 5 INCH EQUATORIAL IN FOREGROUND, PROF. LANGLEY OBSERVING.]

Fig. 4 is a view of a small part of the great apparatus on the field,
including the terminus of the horizontal tube with its canvas covering,
which has been described as like an extended 'A' tent. The photographic
room is seen at the end of the tube, and beyond that the tube
containing the lens loaned by Professor Young pointing directly skyward.

That it will be impracticable to give here all of the disc of the moon
in the large photographs, will be evident when it is considered that
the lunar circumference on each plate is about 4 feet; but it will be
inferred from the examples that the prominences and polar streamers as
well as their features, appear in imposing magnitude and detail.

Many of what it is hoped will be the most interesting photographs still
await development, but Mr. Smillie's thorough preparation is promising
adequate results.


HEAT OF THE CORONA.

Mr. Abbot, with aid of Mr. Mendenhall, appears to have measured the
heat of the corona, and in spite of previous efforts, this is probably
the first time that it has been really shown to exist. For five minutes
before second contact, the bolometer was successfully exposed to the
region of the sky close to the narrowing crescent of the sun where the
corona was shortly to appear. A diaphragm was interposed in the beam
having an aperture of only 0.4 sq. cm. Deflections, rapidly diminishing
from 80 to 6 mm. were obtained, the last being about 40 seconds before
totality. Then the diaphragm was opened to 290 sq. cm. and a negative
deflection of 13 mm. was observed after totality, where these positive
deflections had just been found, showing that the corona was actually
cooler than the background which had been used at the room temperature.
Next the black surface of the moon was allowed to radiate upon the
bolometer, and the still larger negative deflection of 18 mm. was
observed.

The important result was that the corona gave a positive indication of
heat as compared with the moon.

This heat, though certain, was, however, too slight to be sub-divided
by the dispersion of the prism with the means at hand.

The negatives taken to depict the outer corona show from three
to four solar diameters extension for the longest streamers. The
equatorial 'wings,' as they recede from the sun, are finally lost in an
illuminated sky, without any indication of having actually come to an
end.

No attempt to carefully examine the plates taken for intra-mercurial
planets has yet been possible. It is, however, as has been remarked,
doubtful if the very faintest objects will be found, in consideration
of the considerable sky illumination during totality. However, Pleione
in the Pleiades (a star of the 6.3 magnitude), is plainly seen on one
of the plates, and some smaller ones are discernible.

On the whole, the expedition may be considered as promising to be very
satisfactory in its results, and that it was so is largely owing not
only to the efficient care of Mr. Abbot, but to the many gentlemen who
have assisted me with the loan of valuable apparatus, with counsel,
with voluntary service and with painstaking observation, to one and all
of whom I desire to express my obligations.




MALARIA AND THE MALARIAL PARASITE.[E]

BY PATRICK MANSON, M. D., LL. D.,

LECTURER ON TROPICAL DISEASES AT ST. GEORGE'S HOSPITAL AND
CHARING-CROSS HOSPITAL MEDICAL SCHOOLS AND AT THE LONDON SCHOOL OF
TROPICAL MEDICINE.

    [E] Abstract of a lecture delivered at the Medical Graduates'
        College and Polyclinic, and printed in the _Lancet_ of May 19.


This lecture is devoted to a description of the parasite and of its
life cycles. The existence of a parasite in malarial disease has been
suspected for a long time, but only very recently have we had absolute
assurance that such a parasite exists. Some time in the thirties Meckel
described in the human blood certain black particles which he found
in leucocytes and in certain pale, leucocyte-like bodies the nature
of which he did not know. When he saw these bodies he certainly saw
the malarial parasite. His observations were repeated and extended in
the forties and the fifties by Frerichs and Virchow, and they, too,
undoubtedly saw the malarial parasite. But it is one thing to see and
quite another to recognize; discovery is recognition.

The discoveries of Laveran, Golgi, Marchiafava, Bignami and others
resulted in considerable knowledge of the life history of the malarial
parasite and of the correspondence between its life cycle and the
clinical cycle of the disease. Laveran discovered the parasite; Golgi
described the cycle of the tertian and quartan forms; the others added
new data, especially concerning the more malignant parasites. The
malarial parasite in its mature form has the appearance--I shall take
the tertian parasite as a type--of a mass of pale protoplasm occupying
practically the whole of the red blood corpuscles. Scattered through
this mass of protoplasm are a number of black specks or little rods of
intensely black pigment. Later in the life of the parasite a peculiar
thing happens: all these little specks of black pigment concentrate
usually towards the center of the organism whilst the pale protoplasm
arranges itself into little spherules, the whole constituting what is
known as the 'rosette body.' Later in the life of the parasite the
surrounding blood corpuscle breaks away and this rosette body floats
free in the liquor sanguinis and then breaks up into its constituent
spores, setting free at the same time the black pigment clump.
Phagocytes attack many of these free spores and probably absorb most
of them, as well as the little pieces of pigment. The result is the
pigmented leucocyte, so characteristic of malarial blood. A few of
the spores escape and in virtue of some peculiar faculty, which is
not at present understood, enter fresh blood corpuscles and appear
there as pale specks in the haemoglobin. These pale specks, if watched
in perfectly fresh blood, are seen to be possessed of very active
amoeboid movement. They throw out pseudopodia in various directions and
wander about through the haemoglobin of the corpuscle. After a time
they increase in size by assimilating the haemoglobin. By and by there
appear somewhere in the parasite those specks of black pigment which
we saw in the mature animal. Later they increase still further in
size until they come to occupy half, and finally nearly the whole, of
the blood corpuscle. Again there is concentration of pigment and the
formation of little sporules. This is the cycle, as described by Golgi,
of the tertian and quartan parasite. The cycle of the tropical or
aestivo-autumnal parasite corresponds in plan almost exactly with that
of the quartan and ordinary tertian parasite.

It was found that the life cycles of these parasites ran parallel
with the clinical cycle of malarial disease. It was found that when
the parasite had arrived at maturity the apyretic interval in an ague
was about to conclude, and that when the parasite had arrived at the
sporulating stage the patient had entered on the shivering stage of
his fever. During that and the succeeding hot and sweating stage the
spores had entered the red blood corpuscles, and when the parasite had
ensconced itself in the red blood corpuscle and begun to grow, the
fever had come to an end. It was found in tertian fever that the cycle
of the parasite took forty-eight hours to complete, exactly the length
of the cycle of the clinical phenomena. In quartan fever the cycle took
seventy-two hours, exactly the length of the clinical cycle of that
form of malarial disease. In the malignant or tropical fevers there was
found to be a similar correspondence between the cycle of the parasite
and the cycle of the disease. It was found that with each recurring
paroxysm of fever there was a renewal of the life of the parasite, and
that in this way the life of the parasite was continued from period to
period and from cycle to cycle for weeks or even, especially in the
case of quartan malaria, for months. Now this explains very well the
way in which the malaria parasite contrives to maintain its existence
in the human body, but it does not explain how it passes from host to
host, neither does it explain certain appearances that Laveran and
everybody else who has studied the subject have witnessed. In malarial
blood you sometimes see that peculiar body, the flagellated body, which
I have already alluded to as consisting of a sphere surrounded by from
one to six or seven long tentacles or arms in a state of continual
agitation. Neither does it explain the peculiar crescent-shaped body
which also so pointedly arrested Laveran's attention.... Golgi's
scheme leaves the passage of the parasite from host to host and also
the nature of these two bodies unexplained. What relation have these
two bodies to the life of the parasite? Their nature and purpose do
not receive any illumination from Golgi's theory. You will find in all
forms of malarial infection, if you look enough, the flagellated body;
but, strange to say, you will not find it in malarial blood immediately
after it is withdrawn from the body. It is only after an interval of
minutes, perhaps a quarter of an hour, after the blood is withdrawn
that these flagellated bodies appear. Whence do they come? If you make
a preparation of malarial blood from a patient by pricking the finger
and spreading a little of the blood on a slide, fixing it immediately
with heat or alcohol and staining it, you will never see any of these
flagellated organisms. But if the slip be kept moist and in a warm
temperature for half an hour and then stained, the flagellated bodies
will be seen, proving that they develop only after the escape of the
parasite from the human body. Such a fact is very interesting and
obviously has some significance in connection with the life of the
parasite. Whence, I ask, come these flagellated bodies? If one of the
crescent-shaped bodies is observed continuously, the following changes
of shape may often be observed: It becomes shorter, loses its crescent
shape and gives off flagella, which may break off and swim about by
themselves. When they come in contact with a blood corpuscle they
straighten themselves out and indulge in a peculiar vibratory movement,
as if endeavoring to penetrate the corpuscle.

Many years ago King, in America, and others too numerous to mention
suspected that the mosquito had something to do with malaria, but in
what way they could not say. Not only civilized observers had this
suspicion, but the savage natives of certain tropical countries had the
same idea. Koch tells us that certain natives of German East Africa
who lived in a mountainous, and therefore non-malarial, part noticed
that when they descended to the malarial regions on the coast they
acquired a fever which they called 'mbu.' They said that they were
bitten there by certain insects which they also called 'mbu'--mosquito
or gnat. They give the same name to the mosquito and to the fever,
therefore obviously these savages associate the insect and the fever
as cause and effect. Peasants in certain parts of Italy have the same
idea, believing that the bite of the mosquito may be followed by the
development of malarial fever.

Laveran, some years ago, in one of his numerous works on malarial
fever, said that possibly the malarial parasite was cared for by the
mosquito in the same way that the latter cares for the filaria of the
blood. He did not, however, formulate a definite theory on the subject.

In 1894 I was engaged in working at malaria, following out Golgi's work
and that of other Italians. I was particularly struck by the phenomena
of exflagellation and more particularly by the fact that it occurred
only when the blood had been removed from and was outside the human
body. I reasoned that if this exflagellation occurs only outside the
body, the purpose of the flagellated body must lie outside the human
body, and that therefore the flagellated body must be the first phase
of the malarial parasite outside the body, must be the first step that
the malarial parasite takes in passing from one human host to another.
There seemed to me to be a sort of logic in this. But how was the
malarial parasite to pass from one human being to another? It was not
provided while inside the human body with any organs of locomotion or
penetration; as far as we know the parasite is never extruded in the
excreta, neither does it habitually escape in haemorrhages. Therefore,
the idea of a spontaneous escape of the parasite from the human body
had to be dismissed. I therefore concluded that some extraneous agency
must remove the parasite from the human body, so as to afford the
opportunity for this flagellation which I had concluded must constitute
the first step in its extra-corporeal life. In casting about for an
organism which could effect this removal I, for many reasons similar
in some respects to those that influenced the savage African, the
Italian peasant, King, Laveran and others, came to the conclusion
that the medium of removal and transit must be the mosquito. I was so
impressed with the probabilities of this double hypothesis and with
its extreme practical value, should it prove to be correct, that I
endeavored to leave England for a time and to visit British Guiana
or some such suitable malarial country where I might work out the
idea. Unfortunately, that could not be accomplished, so I published
my theory in the hope that it would appeal to someone who might enjoy
the opportunities denied to me. At that time Surgeon-Major Ross was
at home from India and we had many conversations on the subject. I
described to him my hypothesis, the probabilities of which and the
possibilities of which powerfully appealed to his highly logical and
practical mind. He undertook, when he returned to India, to do his best
either to establish or confute it. Accordingly he set to work in India
experimenting with mosquitoes and malaria.

Ross was stationed in Secunderabad, in the south of India, where there
was abundant opportunity for experimental work--plenty of patients and
plenty of mosquitoes. He got patients with crescent parasites in their
blood and he got mosquitoes to bite them. He found that in the course
of a few minutes after the blood had entered the insects' stomachs the
crescent parasites proceeded to the formation of sphere and flagellated
body. But he got no further. This experiment was repeated hundreds of
times. Many of his preparations were sent to me, and I could confirm
from them the accuracy of his statements on the subject. Ross was
encouraged, for obviously we were on the right track. One day Ross,
whose station had in the meantime been changed, caught some mosquitoes
which had been feeding on a patient the subject of tertian malaria.
He kept the mosquitoes and after a few days dissected them. He took
the stomach out and placed it on a slip with a little salt solution,
covered it with a cover-glass and examined it with a microscope. He
was gratified to find lying amongst the transverse and longitudinal
muscular fibres a number of spherical bodies, very sharply defined,
and including a great many grains of intensely black pigment exactly
like those of the malaria parasite. Ross was at once struck with the
similarity. After years of labor he believed he had at last seen the
malaria parasite in the tissues of the mosquito, where we reasoned
it ought to be; and he was right. At a subsequent experiment on the
malarial patient he found exactly the same bodies, and on dissecting
several mosquitoes at different intervals of time he found that the
parasite, which originally was six micro-millimetres in diameter
only, grew to sixty or eighty micro-millimetres, each parasite,
notwithstanding its growth and the lapse of time, still containing the
peculiar and most characteristic black pigment. Ross was now quite sure
that he had found the extra-corporeal phase of the malarial parasite.
Some of these preparations he sent home. I examined them and showed
them to a number of friends in London familiar with the malarial
parasite; they agreed with me, as Laveran also did, in believing that
probably this indeed was the long-sought-for extra-corporeal phase
of the malarial parasite. Ross at that time had great difficulty in
getting opportunities for experiment on the human subject and in
procuring proper mosquitoes. He found that the mosquitoes in which
he had discovered these pigmented bodies were of a different species
to those on which he had formerly experimented, and that in this
circumstance lay the explanation of his lack of success earlier as
well as the secret of his ultimate success. Failing to get sufficient
opportunity for experimenting on human malaria he turned to bird
malaria. He found that the sparrow of Calcutta, in a large proportion
of instances, contained in its blood a malaria-like parasite. Ross
procured a number of infected sparrows and let loose upon them a number
of mosquitoes of a species belonging to the genus _culex_. These
mosquitoes, after from one to ten days, he dissected and examined their
stomachs. He found in the stomach-wall pigmented bodies exactly similar
to those which he found in the stomach-walls of mosquitoes fed on human
malarial blood. He found that they increased in size and in a week or
ten days grew from six to eighty micro-millimetres in diameter. When
they became of considerable size they protruded like warts from the
surface of the insect's stomach and were included in a very definite
capsule. At this stage the capsule was filled with a vast number of
very minute rod-like bodies. These capsules, which now projected into
the body cavity of the insect, being over-distended, ruptured and
discharged the rod-like bodies into the body cavity of the mosquito.
For a time Ross could get no further than this. He could not find what
became of the rod-like bodies. One day, in dissecting the head of a
mosquito, he encountered two small trilobed glands the ducts from
which united to form a main duct. The glands lay on either side of the
head and the common duct he traced to the base of the proboscis of the
mosquito. This was the salivary gland of the mosquito. He found that
the cells of the gland contained rod-like bodies exactly like those
which he had found inside the parasitic capsules in the stomach-wall.
He concluded that somehow these 'germinal rods' (for so he called
them) had managed to find their way into the salivary gland of the
mosquito. It immediately occurred to him that this might be the route
by which the parasite escaped from the mosquito into its vertebrate
host. No sooner had the idea occurred to Ross than he put it to the
test of experiment. He selected a number of sparrows in whose blood
he satisfied himself that there were no parasites and let loose upon
them a number of mosquitoes which he had already infected with malarial
parasites. He found after a week or ten days that the sparrows which
were experimented upon sickened and many of them died; and in their
blood he found the malarial parasite.

We now understand why the flagellated body is developed outside the
human host: because its function lies outside the human host. We now
understand why the flagella break away and enter the granular sphere:
they impregnate it and start it on the road of development. We now
understand why MacCallum's vermicule is beaked and endowed with powers
of locomotion and penetration: that it may approach and penetrate the
stomach of the mosquito. And we now know why the sporozooites, the
'germinal rods,' enter the mosquito's salivary gland: that they may be
injected into vertebrate issue and so pass the parasite from vertebrate
to vertebrate.

This is one of those fairy tales of science which people are inclined
to doubt, but any one who has worked at the subject and taken the
trouble to go through the long series of preparations which have been
sent home from India can not for a moment have the slightest doubt
that what Ross stated was absolutely true, and that not only for bird
but for human malaria. So soon as the idea got abroad that the key to
the way in which the malarial parasite is propagated had been found
the Italians immediately set to work with renewed vigor and with the
utmost skill. Almost at once they demonstrated that what happened in
the case of Ross's sparrows happened also with the human subject: that
the appropriate species of mosquito fed upon the human malarial subject
and subsequently allowed to feed upon a non-malarial subject conveyed
the malarial parasite and malarial disease, and that the appropriate
species of mosquito belonged to the genus anopheles. There can not be
the slightest doubt that the mosquito acts the part of transmitting
agent as well as definitive host of the malarial parasite.

This is a piece of knowledge of the utmost importance to mankind, for
we know that malarial disease in tropical countries--which, after
all, in the future will be the most important parts of the world,
seeing that they can produce more food than temperate countries and
can therefore support a larger population--causes more deaths and more
disposition to death by inducing cachectic states predisposing to other
affections than all the other parasites affecting mankind put together.
We know now in what way this parasite is acquired. Depend upon it,
in time, in virtue of this knowledge, we will get enormous power
over the disease and sooner or later we will be able to prevent the
infection of man by the parasite. It is only a question of study and
the application of the knowledge already acquired, only a question of
money and perseverance and a little ingenuity, and these results will
come. It may not be in ten years or twenty years, but sooner or later
the energies of a considerable portion of scientific mankind now being
expended in endeavoring to devise means for preventing the infection of
men with the malarial germ by the mosquito will bear valuable fruit.

You can readily understand that it is of great importance to be able
to recognize the special species of mosquito which convey malaria.
The effective species as regards human malaria belong to the genus
anopheles; species of the genus culex are effective in the case of
sparrow malaria. Fortunately, these two genera are easily recognized
even by the amateur zoologist. If you find a mosquito clinging to
the wall or other surface you can tell which genus it belongs to by
its posture. If the body is stuck out nearly at right angles to the
surface on which the insect is resting, it is an anopheles. If the body
is almost parallel to the surface, it is a culex. There is another
test which is easily applied if you have a pocket lens; in culex the
two organs known as palpi are rudimentary and very short; whereas
in anopheles those organs are almost as long as the proboscis. It
should be remembered that the male mosquito is not a blood-sucker and
therefore is not dangerous. It is the female anopheles which transmits
the disease. The mosquito larvae inhabit stagnant or slow-running water.
If a mosquito larva be found with its head downwards, the body hanging
at right angles to the surface of the water, it is a culex; if the body
lies parallel to the surface of the water, it is an anopheles. There
are other points of difference with which I need not now trouble you;
those referred to suffice for diagnosis between the innocuous and the
dangerous mosquitoes.

The facts regarding the malaria parasite which I have described are
of great importance for many reasons. First, because they help us to
understand the pathology and etiology of malaria. Secondly, they help
us in diagnosis. Thirdly, our knowledge of the parasite is invaluable
in directing treatment. Lastly, a knowledge of the life-history of the
malarial parasite is of extreme value for the prevention of malarial
disease, for could we by mechanical or other arrangements prevent
the mosquito attacking the human body, we could prevent the malarial
parasites from entering the human body; or if we could abolish the
mosquito by drainage or other means from a country, then we might be
sure that we would abolish the malaria of that country also.

Attempts are being made to solve these practical problems. At the
present moment such attempts are being actively made in Rome by
Professor Celli and elsewhere by others. I have no doubt that in the
course of a few years we shall get some very valuable results in
this direction and that, thanks to this new-born knowledge about the
malarial parasites, better times are rapidly approaching for malarial
countries.




NEW SOURCES OF LIGHT AND OF RONTGEN RAYS.

BY HENRY CARRINGTON BOLTON, PH. D.


Among the general laws of physical science, none seems more firmly
established than that of the conservation and correlation of energy;
according to this the various forms of energy that constitute the
domain of experimental physics, heat, light, electricity, magnetism
and chemical action, have reciprocal dependence and "can not originate
otherwise than by devolution from some preexisting force," or rather
energy. That motion is convertible into heat, heat into light and both
the former into electricity are phenomena familiar to every one who
uses incandescent bulbs or rides in a trolley, and we do not usually
recognize any production of light unaccompanied by heat. True, the
little fire-fly is possessed of a mysterious power that enables it
to emit light without enough heat to affect Langley's most sensitive
bolometer, but the eminent Secretary of the Smithsonian has to admit
that the "cheapest form of light" is produced by "processes of nature
of which we know nothing." This little understood property called
phosphorescence is shared by many living organisms, both animal and
vegetable, as well as by substances of the mineral kingdom; to the
former belong coelenterates, mollusks, crustacea, fishes and insects,
and decaying wood, certain mushrooms, etc.; to the latter the Bologna
stone, so-called, and the commercial article called 'Balmain's paint.'

In the case of the mineral substances, barium or calcium sulfids and
the like, the light-giving power is not an innate property, but is
set in operation by exposure to the energy of sunlight, the light of
burning magnesium or to some other source of actinism; moreover, the
power thus acquired by insolation is a fugitive one, the substances
exercising it after three or four hours become 'dead' and lose their
activity. Excepting then these living beings and these phosphorescent
bodies, light as commonly known to us is always correlated with heat;
within the last four years, however, discoveries have been made in
France that seem to modify the position taken by philosophers and to
necessitate new views concerning the manifestations of that energy with
which the universe is endowed. A group of French savants have found
mineral substances that apparently give out light perpetually without
any exciting cause, realizing the dream of the alchemists--a perpetual
lamp consuming no oil. These substances also emit rays having the
penetrating properties of X-rays, other rays affecting a photographic
plate, and fourthly, rays causing air to become a conductor of
electricity. The history of these discoveries can be briefly given.

Rontgen's discovery of the rays that pass through metals and solids
opaque to light was made in 1895, and in the following year, Becquerel,
a distinguished French academician, discovered that salts of the metal
uranium (substances that had long been used in coloring china and
glass) emit invisible radiations capable of discharging electrified
bodies and of producing skiagraphic images on sensitive plates; he
found that potassio-uranic sulfate emits rays that pass through black
paper and give photographic impressions in the same way as Rontgen
rays. This property is not limited to the brilliantly fluorescent
uranic salts, but is shared by the non-fluorescent uranous salts,
and is exhibited by compounds whether phosphorescent or not, whether
crystalline, melted or in solution, as well as by the metal itself. The
permanence of this activity is amazing, substances kept in a double
leaden box more than three years continuing to exert the power.

Shortly after the announcement by Becquerel, experimenters found that
other substances have the power of emitting 'Becquerel Rays,' such
as calcium and zinc sulfids and compounds of thorium. In 1898 Mme.
Sklodowska Curie, working in the laboratory of the Municipal School of
Industrial Physics and Chemistry in Paris, devised a special apparatus
for measuring the electrical conductivity of the air when under the
influence of 'radio-active bodies,' and by its means studied the
behavior of pitchblende (uraninite), and of other uranium minerals;
finding that some specimens of pitchblende had three times as much
energy as uranium itself, she came to the conclusion that the peculiar
property is due to some unknown body contained in the minerals and not
to uranium. Examining the mineral with the aid of her husband, the two
found a substance analogous to bismuth, four thousand times stronger
than uranium, which was named 'Polonium,' in honor of the native land
of Mme. Curie. In December of the same year, the lady received the
Gegner prize of 4,000 francs awarded by the Academy of Sciences, as
a substantial appreciation of her discovery, and later in the same
month Mme. and M. Curie announced that they had found a second body in
pitchblende, which they named 'Radium.' More recently, M. Debierne,
working under the auspices of Mme. Curie, has discovered a third
body, which he calls 'Actinium,' an unfortunate appellation because
'actinium' has already been used for an element announced by Dr.
Phipson and since discarded.

These three 'radio-active' substances do not possess identical
properties; their rays are unequally absorbed and are differently
affected in a magnetic field; moreover radium emits visible rays, while
polonium does not. Nor have they the same chemical affinities; polonium
belongs to the bismuth group, radium to the barium and actinium to the
titanium series. They have not been separated perfectly from their
analogues, and consequently their chemical properties and the actual
intensity of their physical activities is very imperfectly known. The
difficulties of securing even small quantities of crude materials
are enormous; Fritz Giesel obtained from one thousand kilograms of
raw material only fifteen grams of active compounds, and Mme. Curie,
operating on half a ton of the residues of uranium from a chemical
manufactory, got about two kilograms of barium chloride rich in radium,
but the percentage of active substances in these mixtures is unknown.

Radium is spontaneously luminous, and all the bodies emit rays that
excite phosphorescence in gems, fluorite and other minerals; they
communicate radiant energy to inactive substances, and they exert
chemical action, transforming oxygen into ozone and producing changes
in the color of glass and of barium platino-cyanid.

Through the enterprise and liberality of the Smithsonian Institution,
and by the courtesy of Professor Langley, I have enjoyed the
opportunity of studying small specimens of these rare and costly
substances; they comprised ten grams of 'radio-active substance'
prepared by a manufacturing chemist of Germany and smaller quantities
of 'radium' and of 'polonium' from Paris. On removing the wrappings
of the German specimens in a dark room, they were seen to emit
greenish-white light that gave to the enveloping papers a peculiar
glow, similar to the fluorescence produced by Rontgen rays. Simple
tests of the radium showed that it gave the usual reactions of barium;
on boiling it with water it lost its luminosity, but on heating to dull
redness this property returned in the dark. It also caused a barium
platino-cyanid screen to fluoresce.

Experiments to test the actinic power of these bodies gave interesting
results; on exposing sections of photographic plates, at distances of
five inches, from two to twelve minutes, bands were obtained varying
in intensity with the duration of action. By exposing sensitive plates
behind negatives to the radiant materials from two to three hours,
excellent transparencies were secured; on substituting Eastman's
bromide paper good prints were obtained.

The penetrating power of the rays emitted permits the production
of skiagraphs; the plates were enveloped in Carbutt's black paper
(impermeable to light), and on them were laid pieces of tinfoil cut
in openwork pattern; after one hour's exposure negatives were secured
plainly showing the pattern. Analogous experiments were carried on with
the specimens from Paris, but they were only one fifth as strong in
effects; that labelled 'polonium sub-nitrate' had positively no action
on the plates used.

The primary source of the energy manifested by these extraordinary
substances has greatly puzzled physicists, and as yet remains a
mystery. Mme. Curie, speculating on the matter, conjectured that all
space is continually traversed by rays analogous to Rontgen rays, but
far more penetrating, and not capable of being absorbed by certain
elements of high atomic weight, such as uranium and thorium. Becquerel,
reflecting on the marvellous spontaneous emission of light, said: "If
it can be proved that the luminosity causes no loss of energy, the
state of the uranium is like that of a magnet which has been produced
by an expenditure of energy and retains it indefinitely, maintaining
around it a field in which transformation of energy can be effected;
but the photographic reductions and the excitation of phosphorescence
require an expenditure of energy, of which the source can only be in
the radio-active substances." Somewhat later, Becquerel hazarded the
opinion that the radiation is composed at least in part of cathodic
rays; but these have been proved to be material, hence the induced
activity must be caused by material particles impinging upon the
substances excited. This materialistic theory seems to be confirmed by
the results of ingenious experiments made by Mme. and M. Curie; they
placed a sensitive plate beneath a salt of radium supported on a slab
of lead, in the vicinity of an electro-magnet. Under these conditions,
when the current was passing, the rays emitted were bent in curved
lines upon the sensitive plate, making impressions.

It may be objected, says a French writer, that the materialistic theory
requires us to admit actual loss of particles of matter, nevertheless
the charges are so feeble that the most intense radiation yet observed
would require millions of years for the removal of one milligram of
substance.

While writing these lines, we have news of experiments that seem to
throw doubt on the elementary character of these radio-active bodies;
Bela von Lengyel, of Budapest, claims to have prepared the so-called
'radium' synthetically. By fusing with the heat of electricity uranium
nitrate mixed with a small percentage of barium nitrate, and treating
the mass with acids, he obtained a substance that gives out actinic
rays, Rontgen rays, excites platino-cyanid screens and causes air to
conduct electricity; in short, the Hungarian chemist gets material
possessing all the properties characteristic of the 'element' announced
by Mme. Curie.

Admitting that radio-active bodies can be manufactured to order, are we
any nearer explaining their mysterious powers?

Speculations as to the future history and applications of these
wonder-working bodies press upon even the dullest imagination; if a
few grams of earth-born material, containing only a small percentage
of the active body, emit light enough to affect the human eye and a
photographic plate, as well as rays that penetrate with X-ray power,
what degree of luminosity, of actinism and of Rontgenism (if the
term may be allowed), is to be expected from an hundred weight of
the quintessence of energy purified from interfering matter? And to
what uses is this light-generating material to be applied? Are our
bicycles to be lighted with discs of radium in tiny lanterns? Are these
substances to give us the 'cheapest form of light?' Are we about to
realize the chimerical dream of the alchemists?

Seriously, in what direction is profound study of these substances
going to lead us? Will it not greatly extend our knowledge of physical
manifestations of energy and their correlation? In what corner of
the globe will be found the cheap and convenient supply of the raw
material yielding the radio-active bodies? Will not chemists be obliged
to re-examine much known material by laboratory methods conducted in
the dark? Many of us have worked up pounds of pitchblende to extract
the uranium oxids, and in so doing have poured down the waste-pipe or
thrown into the dust-bin the more interesting and precious bodies.

Whatever the future may bring, scientists are deeply indebted to
Becquerel and to Mme. and M. Curie for placing in their hands new
methods of research and for furnishing a novel basis for speculation
destined to yield abundant fruits.




DISCUSSION AND CORRESPONDENCE.


_WASHINGTON AS AN EXPLORER AND SURVEYOR._

Washington was a surveyor and explorer before he entered upon the
fields of war and statecraft, and his honesty of purpose, sincerity of
action and accuracy of statement and method, so manifest throughout
his career as a soldier and statesman, are found also in the earlier
record. At the age of sixteen he crossed the Blue Ridge on horseback
and made a series of successful surveys in the Shenandoah valley,
overcoming physical obstacles with the method and system of a modern
scientist. At twenty-two he led a party into the wilderness of the
valley of the Ohio to treat with the French and Indians. He then became
acquainted with the great resources of the interior, and saw that
the valleys of the James and Potomac afforded unusual facilities for
lines of transportation for the trade 'of a rising empire.' In 1754 he
reported in favor of a scheme of communication between the Atlantic
states and the great west. Sixteen years later he suggested that the
project of opening up the Potomac be 'recommended to public notice.'
The idea contained in the Potomac scheme was of far-reaching import,
and only the present generation can fully realize its significance.

Washington was not only the first to map and recommend the general
route of the great highways called the National Pike and the Chesapeake
and Ohio Canal, which are now in truth 'becoming the channels of
conveyance of the extensive and valuable trade of a rising empire,' but
he was also the first to predict the commercial success of that route
through the Mohawk valley which was afterwards taken by the Erie Canal
and the New York Central Railroad.

One hundred and fifteen years ago he asked: "Would it not be worthy
of the wisdom and attention of Congress to have the western waters
well explored, the navigation of them fully ascertained and accurately
laid down, and a complete and perfect map made of the country.... The
advantages would be unbounded, for sure I am that nature has made such
a display of her bounties in those regions that the more the country
is explored the more it will rise in estimation, consequently greater
will the revenue be to the Union." Again he declared, "I shall not rest
contented until I have explored the western country and have traversed
those lines which have given bounds to a new empire."

Washington did not do this as fully as he wished, but his ambition
has been and is being realized through the medium of hundreds of
enterprises under both national and private encouragement. The result
of a trip made in the fall of 1784 was the real historic beginning of
the Potomac enterprise. On his return he wrote to Benjamin Harrison,
Governor of Virginia, "I shall take the liberty now, my dear sir, to
suggest a matter which would mark your administration as an important
era in the annals of this country if it should be recommended by you
and adopted by the Assembly." He reached far out for those days,
assuming Detroit as a point of departure for the trade of the northwest
territory. His confidence in the practical abilities of the American
people is shown by the remark, "A people who are possessed with the
spirit of commerce, who see and will pursue their destinies, may
achieve almost anything. No person who knows the temper, genius and
policy of this people as well as I do can harbor the smallest doubt."

In urging the Potomac scheme, he later asked that commissioners be
appointed to make a careful survey of the Potomac and James rivers
to their respective sources, and that a complete map of the country
intervening between the seaboard, the Ohio waters and the Great Lakes
be presented to the people. "These things being done," he says, "I
shall be mistaken if prejudice does not yield to facts, jealousy to
candor and finally, if reason and nature, thus aided, do not dictate
what is right and proper to be done."

He introduced his plan to the notice of Congress, thus making the
first suggestion to that body of the policy of national improvements
which the present generation is carrying on, as well as of the policy
of exploration and national surveys to which our Government so firmly
adheres. To-day the Government is carrying forward surveying work by
means of the largest and most thoroughly equipped organizations in
existence, and thus is Washington honored.

The scientific men of to-day owe to Washington profound respect and
gratitude for the scientific spirit he cultivated in his work. The
Government once established on so high a plane, it necessarily followed
that all true science should be encouraged and be enlisted in the
development of the citizen and of the material resources of the nation.

    CHARLES D. WALCOTT,
      _U. S. Geological Survey_,
        _Washington, D. C._


_SCIENCE AND FICTION._

The leading article of the June number of the _Century Magazine_ is
entitled "The Problem of increasing Human Energy," and is written by
Nikola Tesla. Mr. Tesla offers the reader some naive verbal analogies
between the causes of human progress and the 'energy' of theoretical
physics, and a eulogy of a number of inventions which he expects to
make. He intersperses these with sundry remarkable statements such
as, "our own earth will be a lump of ice;" "Though this movement is
not of a translatory character, yet the general laws of mechanical
movement are applicable to it;" "That we can send a message to a planet
is certain, that we can get an answer is probable;" "It is highly
probable that if there are intelligent beings on Mars they have long
ago realized this very idea [the transmission of electrical energy for
industrial purposes without wires], _which would explain the changes on
its surface noted by astronomers_." (The italics are our own.)

Mr. Tesla's doctrine of human energy is in some ways as original as
the inventions and discoveries which he expects to make. Each of us
is, he says, a part of a unitary whole, 'man.' "This one human being
lives on and on.... Therein ... is to be found the partial explanation
of many of those marvelous phenomena of heredity which are the result
of countless centuries of feeble but persistent influence." Now we may
"assume that human energy is measured by half the product of man's
mass with the square of a certain hypothetical velocity ... the great
problem of science is, and always will be, to increase the energy thus
defined.... This mass is impelled in one direction by a force F, which
is resisted by another partly frictional and partly negative force R,
acting in a direction exactly opposite, and retarding the movement of
the mass."

Unhappily Mr. Tesla in his enthusiasm to progress to recommendations of
religion, vegetarianism, the old regime for women and the artificial
preparation of nitrogen compounds, neglects to state which direction
is the proper one for the human mass to follow, north, south, east,
west, toward the moon or Sirius or to Dante's Satan in the centre of
the earth. Nor does he explain how 'enlightenment' makes the mass of
human bodies go in an exactly opposite direction to that toward which
'visionariness' impels them, nor reveal why, if his account be true, he
and a 'visionary' can walk in the same direction. Of course the whole
notion that the 'velocity' of the human 'mass,' _i.e._ the space it
traverses in a given time, has any connection with human progress or is
of any value to anybody or anything, is absurd.

Mr. Tesla has enjoyed considerable, excellent repute as a gifted
student of certain electrical phenomena and one expects a good deal
from his "electrical experiments, now first published." Mr. Tesla,
too, expects a good deal from them. It would take too long to even
note here all the important scientific discoveries which Mr. Tesla
expects to make or all the benefits which he expects to thereby confer
upon mankind in general and in particular upon those who exploit his
inventions. Some samples may be given. War will be rendered harmless by
being reduced to a sort of game between 'telautaumata,' machines which
behave "just like a blind-folded person obeying instructions received
through the ear," any one of which is "enabled to move and to perform
all its operations with reason and intelligence."

Says Mr. Tesla: "I purpose to show that, however impossible it may now
seem, an automaton may be contrived which will have its 'own mind,'
and by this I mean that it will be able, independent of any operator,
left entirely to itself, to perform, in response to external influences
affecting its sensitive organs, a great variety of acts and operations
as if it had intelligence. It will be able to follow a course laid
out or to obey orders given far in advance; it will be capable of
distinguishing between what it ought and what it ought not to do, and
of making experiences or, otherwise stated, of recording impressions
which will definitely affect its subsequent actions. In fact, I have
already conceived such a plan."

Inasmuch as the interest in this telautomatic warfare is to be purely
aesthetic, it would seem as if international bull-fights or kite-flying
or spelling matches or potato-races might do as well, and have the
added advantage of leaving Mr. Tesla's expectations free to wander
among the following prospective discoveries.

New sources of energy, Mr. Tesla thinks, may be opened up, such as a
wheel which shall perform work without any further effort on our part
than that of constructing it. "Imagine a disc of some homogeneous
material turned perfectly true and arranged to turn in frictionless
bearings on a horizontal shaft above the ground. This disk, being under
the above conditions perfectly balanced, would rest in any position.
Now, it is possible that we may learn how to make such a disk rotate
continuously and perform work by the force of gravity without any
further effort on our part.... To make the disk rotate by the force of
gravity we have only to invent a screen against this force. By such a
screen we could prevent this force from acting on one half of the disk,
and the rotation of the latter would follow."

Into further particulars concerning the nature of such a screen Mr.
Tesla does not enter, though it would seem a matter well fitted to
engage his peculiar gifts. The 'screen against gravity' idea has
already entered into a popular story, but scientific men have probably
not given it much consideration.

By producing a 'sink' or reservoir of a low temperature, thereby
inducing the heat of the ambient medium to transform itself in part
into other forms of energy (_e.g._ electrical), Mr. Tesla hopes to "get
any amount of energy without further effort" beyond the amount needed
to create the 'sink.' We should thus employ "an ideal way of obtaining
motor power," and incidentally rebuke the narrow-minded physics of
Carnot and Lord Kelvin.

By means of his electrical oscillator Mr. Tesla has satisfied himself
that he can transmit electrical energy in large quantities without
wires. He expects that this can be done to great economic advantage.
Then would come the golden age. "Men could settle down everywhere,
fertilize and irrigate the soil with little effort, and convert barren
deserts into gardens, and thus the entire globe could be transformed
and made a fitter abode for mankind."

The golden age figures largely in Mr. Tesla's article; he offers us all
that is entrancing and wonderful. He is generous. We ask for the bread
of definite facts of science and intelligible evidence, but he gives
us the amethyst and topaz and diamonds of an ambient medium doing all
our work and the atmosphere transporting all our motive power and the
tyrant gravity held powerless by a screen, and Mr. Tesla correcting
Lord Kelvin's errors. Still amethyst and topaz and diamonds are only
stones. They may dazzle the magazine reader, but they do not nourish
the student of science.

The editorial department of the _Century Magazine_ perhaps felt that
these jewels were a bit too bright. We read there that "much that
must seem speculative to the layman can take its proper place only in
the purview of the scientist." Some conservative scientists will feel
like growling, "And much that must seem bosh to the man of science can
take its proper place only in the purview of the editorial departments
of popular magazines." Leaving aside the present case, it is a fact
that the same care which is exercised by editors to secure in their
contributions excellence of style and syntax, a proper moral tone and
freedom from advertisement of business ventures, is not exercised to
secure accuracy in statements of fact or decent credibility in matters
of theory. The editors apparently impute to their readers a desire to
be entertained at all costs. They descend to a footing with the Sunday
newspaper instead of trying to rise to the level of such scientific
literature as Huxley or Tyndall gave us. They evidently often do not
know science from rubbish and apparently seldom make any effort to
find out the difference. They should at least submit their scientific
literature to competent men for criticism and revision.

The general public is helpless before any supposedly scientific
statement. It may judge vaguely by the standing of the paper or
magazine or book containing it, by the name of the writer or by the
general tone in which the article is written. But it cannot judge
definitely by comparison with relevant facts or by critically examining
the logic of the deductions, for the general public lacks both
knowledge of the relevant facts and training in logical criticism. That
a man should invent a microscope which will enable one to see objects
a million times as small as can be seen with the naked eye seems no
more questionable to the general public than that a man should cause
unfertilized eggs to develop. Yet the first would be impossible while
the second has been possible, probable, and still more lately proved.
Guidance in scientific matters should be welcome if only for the
protection thus given against fraudulent medicines, bogus inventions
and nonsensical enterprises.

    PHYSICIST.




SCIENTIFIC LITERATURE.


_MATHEMATICAL PHYSICS._

The memoirs presented to the Cambridge Philosophical Society on the
occasion of the jubilee of Sir George Stokes, have been published
in a stately volume by the Cambridge University Press. A year ago
some four hundred men of science met at Cambridge to celebrate the
fiftieth anniversary of the appointment of Sir George Stokes to the
Lucasian professorship of mathematics, a chair held by Newton and
a distinguished line of mathematicians. An official account of the
proceedings, with a portrait of Professor Stokes, is given in the
volume now issued. The seventy-two institutions sending delegates are
arranged chronologically in the order of their foundation, and it is
not unworthy of note that among the sixteen oldest institutions, the
United States has five representatives, whereas Great Britain has
thirteen universities and colleges younger than the Johns Hopkins
University. The Rede lecture given by M. Alfred Cornu and entitled
'La theorie des ondes lumineuses,' is published in French, even the
quotations from Newton's 'Opticks' being translated into that language.
M. Cornu states that by 'une etude approfondie' of the 'Opticks,'
his lecture shows that Newton favored Descartes's undulatory theory
of light, rather than the emission theory usually attributed to him.
The twenty-two memoirs that follow cover a wide range of subjects,
nearly all of which have, however, a connection with the researches
of Professor Stokes. They include three contributions from the United
States, mathematical papers by Profs. E. W. Brown and E. O. Lovett, and
a description by Professor Michelson of his echelon spectroscope.

In addition to this memorial volume, the Cambridge University Press,
which is represented in America by The Macmillan Company, is at
present publishing the collected papers of three eminent students of
mathematical physics. The first volume of Lord Rayleigh's 'Scientific
Papers' contains seventy-eight contributions published from 1869 to
1881. The early papers show the influence of Maxwell, Lord Rayleigh's
predecessor in the chair of experimental physics at Cambridge, but it
was apparently not until 1881 that he fully appreciated the importance
of Maxwell's electro-magnetic theory of light. The papers on acoustics
were followed by the publication in 1877 of the classical work on the
'Theory of Sound.' Lord Rayleigh, at an early period, treated various
optical subjects, including some of the phenomena of color vision.
His explanation of the blue color of the sky and his treatment of
the resolving power of telescopes are well known. The contributions
on optics and acoustics have been continued to the present time, but
they by no means limit his interests. There are important papers on
hydrodynamics and mathematics, and longer and shorter contributions on
a great range of subjects in mathematical physics, the science which at
the present day is perhaps of supreme importance.

The second volume of Professor Tait's 'Scientific Papers' contains
those published since 1881. The first volume consisted of sixty
papers, and this volume, which has followed with but little delay,
adds seventy-three. As must be the case in collected papers, some are
elaborate treatises while others fill only part of a single page;
some are extremely technical while others were first published in the
'Encyclopaedia Britannica' and the 'Contemporary Review.' Among the
more elaborate papers are those on the physical properties of water
contributed to 'The Voyage of H. M. S. Challenger,' on the kinetic
theory of gases, on impact and on quaternions.

The third series just published by the Cambridge Press is the 'Papers
on Mechanical and Physical Subjects', by Prof. Osborne Reynolds, of
Owens College. The first volume contains forty papers from transactions
and journals issued from 1869 to 1882. The most elaborate memoir is
that on certain dimensional properties of matter in the gaseous state,
which includes experiments on thermal transpiration of gases through
porous plates and a theoretical extension of the dynamic theory of
gas. Many of the papers, such as those on meteorological phenomena
and the steering of vessels, are of popular interest. The Cambridge
University Press is performing a work of the utmost value to science
in undertaking the publication of these great volumes, and we can only
regret that, in spite of the beginnings made at Johns Hopkins, Chicago,
Pennsylvania and Columbia, American men of science have no such
opportunities for the publication of their works as those afforded at
Cambridge and Oxford.


_BOTANY._

That a large amount of popular interest centers in the study of tree
life and all subjects incidental to forestry and horticulture is
evidenced by the appearance of a second book on the subject under the
title of 'Our Native Trees and How to Identify Them' (Scribners), by
Harriet L. Keeler. The volume in question takes up the trees native of
northern United States east of the Rocky Mountains, together with a few
well-known foreign species which have become naturalized in this region.

The book opens with a key to the families of dicotyledonous species
based upon leaf characters, and every species receives not only a full
technical description, but also comes in for interesting comments
upon habit and general ecological relations. Numerous drawings and
half-tones add to the accuracy and clearness of the descriptions. It
is not too much to say that the photographic reproductions surpass in
beauty and presentation of detail any recent botanical publication, and
the venation of leaves is shown in most instances by this method quite
as well as it might be done by means of pen and ink sketches. The value
of the descriptions is heightened by the inclusion of notes of economic
interest. It is not unexpected that some errors should creep into the
discussions on almost all phases of botany which are interspersed
throughout the volume.

The appearance of a new botanical dictionary is most timely, and it
is fortunate that the task of its preparation should be undertaken
by such a skilful bibliographer as Mr. B. D. Jackson. His 'Glossary
of Botanical Terms' (Lippincott) contains fifteen thousand words,
or three times as many as have been included in any previous work
of this character. This is indicative of a most energetic pursuit
of investigations in all departments of the subject, and also of a
lamentable tendency to the coinage by botanists of new and unnecessary
terms upon the slightest pretext. A legitimate factor in the increase
of the contents of such a work consists in the inclusion of words in
common use which take on a technical meaning in botany; such, for
instance, as altitude, abnormal, abrupt, absolute, accidental back, etc.

Derivations are given, but the history of the terms has not been
attempted. According to the author, 'anlage' may be variously rendered
as _rudiment_, _inception_ or _primordium_. 'Chlorophyll' receives the
double consonant at the end of the last syllable against the popular
extra-botanical practice. Regarding 'medullary' the author says: "I
have given the accent as it is always spoken (medul'-lary) though all
of the dictionaries (_botanical?_) accent it as med'-ullary except
Henslow's." In this the author had in mind the practice among his
insular colleagues only, since the latter pronunciation is given in
the Standard, Century and Webster's Dictionaries and is followed by
nine tenths of the American botanists. "Mycorhizome = mycorrhiza-like
structures in Corallorhiza and Epipogum roots," and "Mycorrhiza =
symbiotic fungi on the roots of plants, prothallia, etc.," are not only
incongruous with orthography and botanical fact, but also with the
usage of all recent writers on this subject.

While many other errors of this character could be adduced, the general
value of the book is scarcely lessened, and it will be of the greatest
service to the working botanist, not only in raising the general
literary tone of his writings, but also in placing at his command a
choice of all of the established terms dealing with any phase of the
subject; an aid which will be greatly conducive to increased accuracy
of statement.

A decade since, the majority of the botanists engaged in the study
of the distribution of plants on this continent, as well as the
strict systematists, were quite unanimously of the opinion that the
territory within the boundaries of the United States had been quite
thoroughly explored, and that the task of the collector are well-nigh
done. Despite this discouraging conclusion a few enthusiastic workers
have not intermitted their labors in a more critical consideration of
the floras of the newer and less thickly settled regions, with the
result that scores and hundreds of new species have been brought to
light each year, and the awakening interest in the subject promises a
re-exploration of the great West.

A striking example of the results awaiting the student in this line is
afforded by Dr. Rydberg's 'Flora of Montana and the Yellowstone Park'
(New York Botanical Garden), which has recently appeared. Although
the first collections of plants in this region were made by the Lewis
and Clarke expedition nearly a century ago, Dr. Ryberg finds 163 new
species and varieties in the 1,976 which he lists in this volume.
Of this number 487 are found on both the eastern and western <DW72>s
of the continental divide, 268 on the eastern side only, 520 on the
western side only, 42 of which are arctic and inhabit the high mountain
summits, and 659 which have originated in the exact region under
discussion. Seven hundred and seventy-six of the species listed were
not included in Coulter's 'Rocky Mountain Botany,' published a few
years ago.

The symposium on the 'Plant Geography of North American,' to be given
at the coming meeting of the American Association for the Advancement
of Science, will do much to systematize investigations of this
character and broaden the method of treatment accorded the subject in
the future.


_BIOLOGY._

The 'Biological Lectures from the Marine Laboratory of Woods Holl,
1899,' make up a volume of about three hundred pages which represent
fairly the present tendencies of biological investigation in this
country. The most striking things about the lectures are the wide range
of topics which they treat, and the first-hand quality of the subject
matter in each case. This is most clearly seen by a careful reading of
the text, but a mere enumeration of a few of the sixteen titles and
lectures makes it fairly obvious. Thus, D. P. Penhallow writes on 'The
Nature of the Evidence Exhibited by Fossil Plants, and its bearing upon
our Knowledge of the History of Plant Life;' D. T. MacDougal writes
on the 'Significance of Mycorrhizas,' Edward Thorndike on 'Instinct,'
Herbert S. Jennings on 'The Behavior of Unicellular Organisms,' Alpheus
Hyatt on 'Some Governing Factors usually neglected in Biological
Investigations,' T. H. Morgan on 'Regeneration,' C. B. Davenport on
'The Aims of the Quantitative Study of Variation,' Jacques Loeb on 'The
Nature of the Process of Fertilization.'

To the professed scientist these lectures will furnish expert opinion
on certain important topics; the general reader will find in them a
presentation not too technical or detailed. Professor Loeb's lecture,
for example, is for such readers the best account yet given of his
experiments in artificial fertilization.

The range and originality which characterize these lectures are really
characteristic of the general work and spirit of the Woods Holl
Laboratory. Few people realize the amount of research work which is
done there from summer to summer. Yet last year there were seventy-one
investigators there. Moreover, these represent a superior selection
from among the instructors and students of the various colleges.

It is a symptom of a healthy, vigorous condition in biological science
that the best workers of the country are glad to devote their vacation
season to research, and it is highly creditable to the Woods Holl
management that it offers them such attractive facilities. Similar
summer laboratories are now being established in other parts of the
country, and are to be reckoned with as very important factors in the
progress of biology.


_CYTOLOGY._

It is a somewhat surprising fact that among educated people of
scientific training there prevails generally the greatest ignorance as
to some of the most important problems of biology. We refer to those
problems connected with the structure and functions of the animal and
plant cell. Men who can understand and appreciate recent discoveries in
astronomy, physics, chemistry and geology are usually wholly lost in
cytology. In fact, in general writing or speech it is not safe to use
this name without at once defining it, since it is commonly supposed to
be a mispronunciation or a stupid misspelling of 'psychology,' while
to most people _nuclei_, _chromosomes_, _centrosomes_ and _mitotic
spindles_ are words without meaning, signifying nothing.

The reason for this is twofold: First, cytology is one of the newest
of the biological sciences and it has but recently found its way into
college curricula, and second, there have been few text-books or
general works on this subject to which an intelligent layman could turn
for information.

And yet, in spite of this fact, there are few fields of scientific
work possessing more general interest than that of cytology. At the
present day the greatest problems of biology are centered in the cell.
Assimilation, growth, metabolism, reproduction, differentiation,
inheritance and variation--these are at bottom cellular phenomena, the
result of the structure and functions of cells. It is not surprising,
therefore, that "all the searchlights of science have been turned
upon the cell," and that cell studies during the past ten years have
received an amount of attention which is comparable only to that
devoted to evolution under the stimulus of Darwin's work.

Professor Wilson's book on the cell,[F] the second edition of which
has just appeared, is a work of more than ordinary interest, not only
to the biologist, but to all persons who are interested in the general
advance of science. Although there are several other good text-books
of cytology which have appeared during the past five or six years,
Professor Wilson's book, in thoroughness of treatment, in philosophical
insight, in clearness and forcefulness of style and in wealth and
beauty of illustrations, easily surpasses them all.

    [F] The Cell in Development and Inheritance. Edmund B. Wilson.
        Second Edition Revised and Enlarged. Columbia University
        Biological Series IV. New York and London, The Macmillan
        Co., 1900. Pp. xxi, 483 with 194 Figures in the Text. $3.50

It is impossible in this brief note to give any adequate summary of
the volume or of the position of the author on questions of general
interest; the subjects of the chapters, however, may serve to give some
idea as to the scope of the work. After an introduction which gives a
brief historical sketch of the cell theory and its relation to the
evolution theory, there are taken up in successive chapters a general
sketch of cell structure, cell division, the germ cells, fertilization
of the ovum, the formation of the germ cells and the halving of their
nuclei preparatory to fertilization, cell organs and their relations
to each other and to the life of the cell, cell chemistry and cell
physiology, cell division in its relation to the development of the
egg, and finally, some theories of inheritance and development. In
addition, there is appended an excellent glossary and a list of all the
most important literature on the subject up to the current year.

While the work is undoubtedly intended as a reference book for
investigators and advanced students in biology, being marked by the
thoroughness of treatment of an original communication, it is yet
so well written and so copiously illustrated as to make it not only
intelligible but also intensely interesting to the general reader.


_EDUCATION._

The most important recent book on education is undoubtedly 'Education
in the United States,' a book prepared in connection with the
educational exhibit of this country at the Paris Exposition. It
consists of a series of monographs which cover all the important
phases of educational endeavor in the United States. The two volumes
include nearly a thousand pages, almost all of which present
definite and reliable facts. Only rarely is there any indulgence in
expressions of private opinion, and still more rarely is such opinion
questionable. The editor is justified in his statement that the book
is 'a cross-section view of education in the United States in 1900.'
It will be of great value to the student of American institutions or
of education in general, and should be of interest to any citizen who
desires to be well informed about his country. The quality of the
monographs will be evident from the list of the author's names. For
instance, those writing on higher education are Prof. A. F. West, of
Princeton; Prof. E. D. Perry, of Columbia; President Thomas, of Bryn
Mawr; Director Parsons, of the University of the State of New York;
President Mendenhall, of the Worcester Polytechnic Institute, and Prof.
H. B. Adams, of Johns Hopkins.




THE PROGRESS OF SCIENCE.


The conditions in the United States have been favorable to the
development of geology. The varied forms of the land have offered
abundant opportunities for research, whereas the practical value of
the work has led to the establishment of surveys, the magnitude of
whose contribution to geology is only known to special students. The
Geological Society of America has about two hundred and fifty members,
nearly all of whom are actively engaged in geological research, perhaps
a larger number than in any other science. The U. S. Geological
Survey is the center of this movement, and its great efficiency is in
large measure due to Mr. G. K. Gilbert, now president of the American
Association for the Advancement of Science. He was born in Rochester,
N. Y., in 1843, and after graduating from the university in that city,
acted for five years as assistant in the Ward Museum, where a number
of eminent naturalists have been trained. He then became geologist
in the Ohio Survey under Newberry, was engaged in the Wheeler and
Powell Surveys, and has been geologist in the U. S. Geological Survey
since its establishment in 1879. In the arid west, where the face of
the earth is bare, Mr. Gilbert made the observations and discoveries
in dynamical and physical geology which have done so much toward the
making of the science of physiography. His monographs on the Henry
Mountains and on Lake Bonneville, the name he gave to the ancient lake
that once filled the Utah basin, are models, both in regard to their
original discoveries and the methods of presentation. He has extended
his studies to the basins of the Laurentian Lakes and to other regions,
always with important results. Mr. Gilbert has been president of the
American Society of Naturalists, the Geological Society of America and
the Philosophical Society of Washington, and has received the Wollaston
Medal of the Geological Society of London. His presidential address
before the American Association will be given at the American Museum of
Natural History, New York City, on the evening of June 26, his subject
being 'Geological Rhythm.'

       *       *       *       *       *

The meeting of the American Association in New York City, opening as
this issue of the MONTHLY is published, promises to be of more than
usual importance. The preliminary programs of the different sections
show long lists of valuable papers and promise the attendance of
leading men of science from all parts of the country. A movement of
interest is the increasing tendency of special scientific societies
to meet in conjunction with the Association. No less than fifteen
societies will this year hold their sessions at Columbia University,
some of them joining with the sections of the Association, and
others holding independent meetings. The members of these different
societies have the advantage of the reduced railway rates and other
arrangements which can be made once for all, and the still greater
advantage of meeting scientific men in other departments. As science
grows in details and in range, there is on the one hand an increased
specialization, making it desirable for small groups of experts to
meet together to discuss their special problems, while, on the other
hand, almost every scientific question has ramifications extending to
many sciences. Hence, the need of many separate societies and at the
same time of a common meeting ground. When the American Association
was organized, in 1848, its members could meet in one body; later
they divided into two sections, one for the exact sciences and one
for natural history. In 1882 nine sections were organized, but it was
not until 1892 that botany was separated from zoology. At present
the sections no longer suffice, and there must be either a further
sub-division and a more efficient organization of the sections, or the
American Association must become an administrative body, that will
arrange for the simultaneous meetings of independent societies and the
union of these societies in support of their common interests.

       *       *       *       *       *

The obvious advantages of meeting together have now led nearly all the
national scientific societies to select either the time of the American
Association or Christmas week for joint meetings. It is unfortunate
that they should be divided into two groups, and it must be admitted
that neither midsummer nor the Christmas holidays are altogether
suitable for the meetings. The American Association has this year made
the experiment of selecting the end of June, immediately after the
close of the college sessions, instead of a week in August. This has
some advantages, but even at the beginning of the summer many men of
science are either abroad or are engaged in scientific expeditions. The
heat is apt to be excessive, interfering not only with the meetings,
but also requiring some self-sacrifice on the part of scientific men
when they leave their comfortable summer homes to travel through heat
and dust to a hot and dusty city. Christmas week, divided by Sunday,
is too short for a series of scientific meetings, especially for those
who must travel from a distance. This led to the organization last
winter of the Cordillerean Geological Society, the Western Society
of Naturalists and the Western Philosophical Association. Local
associations are, of course, valuable, but they should not interfere
with one central meeting in the course of the year. The plan has been
suggested of taking one week, either immediately after the New Year or
in the early spring, for a general scientific gathering, which would
include not only the exact and natural sciences, but also philology,
history, etc. The plan would be to secure an adjournment of exercises
or leave of absence in the case of universities, colleges, museums,
Government departments, etc., with the understanding that it would be
the duty of all those who were released from their regular work to
attend the meetings.

       *       *       *       *       *

The American Association last met in New York City in 1887, though
there was a meeting in Brooklyn in 1894. The past thirteen and even
the past six years have witnessed an extraordinary development in the
educational and scientific institutions of the city. Columbia College
and New York University have developed into great universities, each
having found a new site and erected upon it buildings which might have
been expected to come only as the growth of a century. The American
Museum of Natural History has become one of the great museums of the
world, millions of dollars having been spent on buildings. A botanical
garden and a zoological park have been established, which promise to
rival those of any of the European capitals. A well-equipped aquarium
has been opened under the auspices of the city; the Metropolitan
Museum of Art has been entirely rebuilt to accommodate its increasing
collections; a magnificent building is in course of erection for the
Public Library to contain its great assemblage of books, which with
its endowment is largely the result of recent years. While Boston
and Philadelphia have made great advances within the last few years,
and Washington has become the chief scientific center of the United
States, it is especially noteworthy that New York City has enjoyed an
educational and scientific development commensurate with its material
resources.

       *       *       *       *       *

Jonas G. Clark, who ten years ago established at Worcester a
university and christened it with his name, has died and left to
the university several hundred thousand dollars, and on certain
conditions practically the whole of his estate, which is said to
be between five and ten million dollars. The will is a complicated
document with numerous codicils, somewhat difficult to interpret and
likely to give rise to legal complications. The history of Clark
University has been curious and interesting. As in the case of the
Johns Hopkins University, there was a difference of opinion between
the founder and the president as to the scope of the institution. In
both cases the founder had in view a more or less local college, while
the president believed that we had colleges in sufficient number, but
needed in the United States universities on German models, but going
even further than Germany in making research rather than instruction
the primary object of the institution. Johns Hopkins died very soon
after the establishment of his university, and though there was for a
while a good deal of difference of opinion in the board of trustees,
the university idea triumphed. A college was, however, established
in connection with it. At Clark University the founder lived for ten
years, and appears to have altered several times his point of view. He
withdrew his support, and the university work which began brilliantly
was much reduced in range and quality. The greater part of the faculty
removed in a body to the University of Chicago. It appears that at this
time Mr. Clark bequeathed his money to the university only on condition
that the president should resign, but later devised a compromise by
which the university should continue as at present, while a partly
independent college should be established in conjunction with it. The
interpretation of the will, the value of the estate and the development
of the university open problems that will only be settled in the course
of time.

       *       *       *       *       *

Europeans who look upon the United States as a material and commercial
nation must find it difficult to interpret the great gifts that are
continually made for the cause of higher education. Twenty-five years
ago there were in America no universities in the sense in which the
term is most properly employed. During this comparatively brief period
the older institutions have become universities, and the great increase
in expenditure has been met chiefly by voluntary contributions. The
annual expenditure, for example, at Harvard and Columbia Universities
is about a half million dollars beyond the tuition fees, and the money
invested in grounds and buildings, is in the case of either university
many millions. Then this period has witnessed the establishment of new
universities, rivaling in endowment the older institutions. The Johns
Hopkins University and Clark University have been mentioned above, but
the most noteworthy instances are the University of Chicago, to which
one benefactor still living has given eight million dollars, and Leland
Stanford Junior University, the endowment of which reaches the enormous
sum of thirty-five million dollars. At the same time, the State
universities, directly supported by the people, are beginning to rival
privately endowed institutions. It may be confidently asserted that no
nation has ever so liberally supported higher education, and the wisdom
of this liberality is now demonstrated, even from the most mercenary
point of view, by the place the United States has taken in the world's
commerce. It will be still further demonstrated in the course of the
next twenty-five years. It is possible that existing conditions are not
favorable to literature and to art, but the future of science in the
United States is assured beyond question.

       *       *       *       *       *

It is sometimes said that Government control and individual initiative
can not be united, but there is no justification for this view in the
development of the educational and scientific institutions of the
United States. Institutions established by private initiative have
been assisted by the State, and State institutions have received large
sums from private individuals. The New York institutions referred to
above--the American Museum of Natural History, the Metropolitan Museum
of Art, the Public Library, the Botanical Gardens and the Zoological
Park--are in almost equal measure supported by the city and by citizens
of the city. Johns Hopkins University, the University of Pennsylvania,
Cornell University and other privately endowed institutions have
received assistance from the State, without any decrease in private
gifts, while the State universities, California for example, are
receiving large private endowments in addition to their support from
the State. These conditions may not last, but at all events they obtain
at the present time, and we find the country in which the largest gifts
from private individuals are made for education and science to be the
country in which they are most liberally supported by the Government.

       *       *       *       *       *

Never before has any government made such great appropriations for
the development of the resources of the country or for the advance
of science as the Congress which has just adjourned. We may take for
example the Department of Agriculture, for which the appropriation is
$4,023,500, an increase of more than $280,000 over the appropriation
for the preceding year. Every one familiar with the conditions at
Washington and throughout the country will know that this large sum of
money is expended with the utmost economy, and there is no doubt but
what the money invested by the nation is returned to the people many
fold in the course of every year. Some of the items of the bill deserve
special notice. Thus, a new agricultural experiment station is to be
established in the Hawaiian Islands, and the work of the Weather Bureau
is to be extended to them. The agricultural resources and capabilities
of Porto Rico are to be investigated, and bulletins of information in
English and in Spanish are to be distributed to the inhabitants. The
division of chemistry is to investigate the use of food preservatives
and coloring matter, determine their relations to health and establish
the principles which should guide their use. The division of forestry
receives an increase of $40,000 and the Weather Bureau an increase of
over $35,000. Other items of the appropriation act are as follows:
Biological Survey, $30,300, an increase of $2,740; Division of Botany,
$43,080, an increase of $14,280; Nutrition Investigation, $17,500, an
increase of $2,500; Division of Pomology, $18,400; Public Road Inquiry,
$14,000, an increase of $6,000; Division of Statistics, $146,160;
Library, $14,000; and Museum, $2,260.

       *       *       *       *       *

While American men of wealth have given freely of their means for the
promotion of education and science, they have not so often devoted
their own time to its service. This is natural, as the wealth has
in most cases been acquired by the present generation, and it is
in succeeding generations, when families have been established,
that leisure and wealth will give a class similar to that which has
accomplished so much for Great Britain and to a lesser extent for
Germany and France. Still, it is the case that the heads of two of
our chief universities are men of great wealth, who have devoted not
only their means, but also their services to the cause of education,
and there are in our universities and other institutions many who
hold their positions purely out of interest in their work, not as a
means for their support. In the next generation there will probably be
more representatives of a class to which belonged the Duke of Argyll,
whose death we were compelled to record last month. Another man has
since died of a somewhat similar type. When Colonel Lane-Fox somewhat
unexpectedly succeeded to large estates in Wiltshire and Dorsetshire
and assumed the name Pitt-Rivers, his chief interest seemed to be
in the earth works and tumuli of Cranbourne Chase, and the extensive
memoirs he has published and the museum he has established show what
good use he made of the excavations. Some of the results of his earlier
work will be found at Oxford, but he built at Farnham, in Dorsetshire,
a museum which contains collections of the greatest possible value.

       *       *       *       *       *

The communication in this issue signed 'Physicist' is worthy of note.
If what its writer says is true, it is evident that a reputation as a
brilliant inventor does not insure that its possessor is a safe writer
about general physics. Our correspondent, who represents fairly the
opinion of scientific men in general, finds fault with Mr. Tesla's
article in the June _Century_ in many important particulars. During the
years since Mr. Tesla's notable invention of the polyphase alternate
current transformer, he seems to have become less definite and exact
in his thinking, and less productive as an inventor. The speculation
and rhetoric of the _Century_ article are certainly disappointing to
every one who is trying to bring about an intelligent and sound view of
science on the part of non-scientific people. Men of science everywhere
should certainly make it their business to instruct people in general
about the progress, and even the prospects, of science through the
press, but it takes wisdom on the part of both writers and editors to
know what is instructive and what is misleading. Honest criticism such
as that of our correspondent is therefore highly desirable.

       *       *       *       *       *

It is generally agreed that the most important advance of last year in
the science of medicine was the discovery that the parasite causing
malaria was transmitted from person to person by mosquitoes. Dr. Manson
describes this discovery fully in this number of the POPULAR SCIENCE
MONTHLY. This summer a crucial experiment is being made of a somewhat
dramatic character. A mosquito-proof tent has been constructed, which
is located in Italy, in the Campagna. In this Dr. Luigi Sambon,
lecturer of the London Tropical School of Medicine, and Dr. G. C.
Low will live until October, taking the utmost care not to be bitten
by mosquitoes. If they escape malaria it will serve as corroborative
evidence that the mosquito is the means of infection. On the other
hand, several Englishmen, including Dr. Manson's son, have offered
themselves as subjects for the complementary experiment. They will
live in a healthy district, but will definitely allow themselves to be
bitten by mosquitoes which are known to be infected. These experiments
will probably be particularly useful in demonstrating to the public at
large the validity of the hypothesis derived last year from technical
bacteriological evidence.




Transcribers' Notes


Punctuation, hyphenation, and spelling were made consistent when a
predominant preference was found in this book; otherwise they were not
changed. Inconsistent spacing in abbreviations was not changed.

Simple typographical errors were corrected; occasional unbalanced
quotation marks retained.

Ambiguous hyphens at the ends of lines were retained.

In this version of this eBook, the British currency Pound sign is
represented by the letter "L".

Page 230: "spectrograph" was misprinted as "spectograph"; corrected
here.

Page 315: "sporozooites" was printed that way.

Page 322: "uranium oxids" was printed that way.

Page 329: "'Plant Geography of North American,'" may be a misprint
for "America".








End of Project Gutenberg's The Popular Science Monthly, July, 1900, by Various

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