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Heisenberg writes in clarification of an error in his calculation concerning the operator xa (xx').

Pauli 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.

Heisenberg replies to Pauli's letter and detailed discussion of Källén's arguments concerning Heisenberg's quantum field theory.

Pauli writes further about biology. He believes, like Bohr, in a logical possibility of biological laws, which aren't contained in today's quantum physics.

Pauli compares some of Yang's equations with his own results.

Heisenberg writes about two additions to his last letter, on a certain spinor and on the conditions for the finiteness of certain operators.

Pauli 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.

Pauli 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.