Philip Morrison provided the, then missing, link to the Unified Concept theory.  The problem as presented was: How could two identical, oscillating phenomenon be attractive rather than repulsive?

Without hesitation, Morrison reached to a shelf for a slim, brown hardcover book, opened it immediately to what seemed the page he wanted; and, pointed to a section that described an approach to the problem's solution.

The book was, "Essentials of Fluid Dynamics" by Ludwig Prandtl, 1949; Hafner Publishing Company, New York, NY.  

On pages 343-5, Paragraph 1, Chapter 5, Section 6, titled: "Bodies in Accelerated Fluid. Hydrodynamical Action at a Distance," was a description by V. Bjerknes of an experiment by C.A. Bjerknes, first published in 1871, concerning bodies that "pulsate in the same rhythm," which are attractive; and, repulsive when they are pulsating "in opposite rhythms."  Exactly, the requisites that the Unified Concept required.

Also an "ellipsoid (of revolution)" is mentioned in the same section.  It was not until much later that the significance of the ellipsoid as it pertained to Pulsoids would be ascertained.

When told that the concerned theory was referred to as the Unified Concept, Morrison thought it sounded like the unified field theory that Einstein was working on.

Morrison, then, suggested that the theory be presented to Einstein.  While driving to Princeton the radio announced that Einstein had died that morning.