Bohr comments on a book by A Pauly (1905) on "Darwinism and Lamarchism". Bohr gives his attitude to the great progress in biology and psychology made in recent time, in the light of the results of atomic physics as regards the description of phenomene.
Sans titreHeisenberg writes in clarification of an error in his calculation concerning the operator xa (xx').
Sans titrePauli writes about Jordan's request to send Thellung a lecture by Pauli on problems of the theory of relativity. He writes about Feynman's paper and about Watson's paper.
Sans titreHeisenberg replies to Pauli's letter and detailed discussion of Källén's arguments concerning Heisenberg's quantum field theory.
Sans titrePauli writes further about biology. He believes, like Bohr, in a logical possibility of biological laws, which aren't contained in today's quantum physics.
Sans titrePauli compares some of Yang's equations with his own results.
Sans titreHeisenberg writes about two additions to his last letter, on a certain spinor and on the conditions for the finiteness of certain operators.
Sans titrePauli is looking forward to reading Jauch's forthcoming book on electrodynamics. He would prefer not to read the book in the proof-state, for this means a certain responsibility.
Sans titrePauli reports on his meeting with Delbrück. He discusses the empirical time scale of evolution and its agreement with theoretical prediction-following from "random mutations" and "selection". He talks about Delbrück's opinion as the most important unsolved problems in biology and the importance of the discovery of DNA.
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