With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Eddington believed he had identified an algebraic basis for fundamental physics, which he termed "E-numbers" (representing a certain group ;– a Clifford algebra). These in effect incorporated spacetime into a higher-dimensional structure. While his theory has long been neglected by the general physics community, similar algebraic notions underlie many modern attempts at a grand unified theory. Moreover, Eddington's emphasis on the values of the fundamental constants, and specifically upon dimensionless numbers derived from them, is nowadays a central concern of physics. In particular, he predicted a number of hydrogen atoms in the Universe 136 × 2256 ≈ 1.57 1079, or equivalently the half of the total number of particles protons + electrons. He did complete this line of research before his death in 1944, but his book "Fundamental Theory" was not published.
text_B: If one wanted to find out about a certain aspect of Eddington's algebraic basis for fundamental physics, could one find that in his "Fundamental Theory" book?
NO.