This paper reviews the algebra of Eddington's E numbers and identifies thosepoints where Eddington anticipated results of current interest. He discovered theMajorana spinors, and was responsible for the standard 75 notation as well as thenotion of chirality. Furthermore, Eddington defined Clifford algebras in eight andnine dimensions which are now appearing in grand unified gauge and supersym-metric theories. A point which Eddington cleared up, yet is still misunderstood, isthat the Dirac algebra corresponds to a five-dimensional base space.