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Born accepts an invitation to a symposium. He hopes to enter his new house in Pyrmont in ten days. He writes on his ideas about an indeterministic, statistical formulation of classical mechanics and the transition from the individual state to a statistical equilibrium. He writes of his impending honorary doctorate in Oxford.

Born replies to a letter from Pauli and gives a clarification of his and Pauli's divergent views as regards the statistical theory of irreversible processes.

Born expresses a great interest in Pauli's paper on Eyl's theory and agrees in particular to his remark that continuum theory cannot be applied to the interior of the electron because of the introduction of quantities which are in principle unobservable. He suggests to Pauli to prove that the surface energy of NaCl cube is smaller than that of any other surface.

Bohr expresses satisfaction at having met Pauli in Göttingen. He writes about a remark made by Lenz on selection absorption of harmonics in the case of an unharmonic oscillator.

Bohr agrees with almost everything in Pauli's last letter. He reports on a long discussion of Heisenberg's theory and its relation to the earlier quantum theory and on the missing aspects and the future of Heisenberg's theory. His letter has given rise to many changes in Bohr's paper of which he encloses a proof published in: Nature : 116 (1945), 845 and in: Naturwissenschaften : 14 (1926), pp.1.

Bohr has made some arrangements for a room for Pauli from April 4.

In April, Darwin, Kramers, Goudsmit and Waller are expected to come to Copenhagen. Bohr asks Pauli if he could also come.

Bohr has sent his manuscript to Naturwissenschaften and asked Berliner to send proofs to Pauli. Most of it is well known to Pauli, but some additions are new. He asks Pauli to send him proofs with critical remarks.

Bohr's thanks Pauli for his enjoyable and interesting letters. The three pages of the letter contains many scientifical questions.

Bohr thanks Pauli for his letters with the quick and thoroughgoing answer to his small heart-outpouring. He and Rosenfeld studied Pauli's letters very carefully and agree of course with most of the contents. Bohr thinks that Pauli underestimates the consequence in the correspondence-attack on the atomic problems based on the low value of the fine structure constant.