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732, [2], xiii pp. Illustrated from photographic plates, text illustrations, and a fold out chart. (4to) purple cloth, gilt spine.

In this paper Dirac developed what is now called transformation theory which demonstrates that wave mechanics and matrix mechanics are really special cases of a quite general approach. the description can be based on any complete set of commuting variables, with an amplitude whose square gives the probability of an observation finding the particular values of these variables. Wave mechanics chooses the particle coordinates; matrix mechanics chooses the energy and any other constants of the motion. The concept and the notation developed here by Dirac form part of the basic tools of modern physics. (Biographical Memoirs of Fellows of the Royal Society, Vol. 23 pp. 164-165).