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Pauli talks about a formula made by Kramers and about his doubts about Goudsmith's idea on the spin of the electron.

Pauli talks about Bohr's paper on the statistical interpretation of quantum results which has its origin in the decision between observed object and measuring instrument. Critical remarks are made on the paper, but Pauli is still very positive about Bohr's conception, especially his view that the stationary states are as real as the particles themselves.

Pauli writes about the little progress he made in his work on supra-conductivity.

Pauli talks about the offers made to Felix Bloch for a post in Göttingen. He urges Bohr to publish his considerations on the spin of the electron.

Pauli writes on the "universal length" and about his discussions with Stern concerning the connection of entropy and observation.

Pauli announces that he is going to send Bohr a copy of his article for the Einstein volume containing a survey of the epistemological situation in quantum mechanics and is eager to hear Bohr's opinion on it. He also asks Bohr to paper for the issue of "Dialectica" on complementarity and talks about a group of experimental physicists in Rome.

Pauli congratulates Bohr on his article for the Einstein volume and makes some little corrections. He announces an international physics conference in Zürich and hopes that Bohr will accept an invitation.

Pauli is glad to have Bohr's letter of May 11th and he hopes that Bohr will soon be back in Copenhagen. Einstein has sent Pauli an article for "Dialectica", which essentially repeats his old arguments. Pauli encloses copies of his letter to Einstein and also his reply. Pauli did not agree with Einstein's point of view expressed in his letter and he did not continue this correspondence. Pauli urgently needs Bohr's promised article for "Dialectica". A short address clarifying some concepts used by Bohr would be sufficient without any discussions of historical questions. They all hope that Bohr will be able to come to the conference in Zürich.

Pauli thanks Bohr for his letter of the 16th October 1948, containing the revised version of the Einstein article and the "Dialectica" article. He makes some comments on his editorial survey. He asks Bohr about a contribution to a physics meeting in July 1949. He also reminds him of Sommerfeld's 80th birthday.

Pauli was glad to have Bohr's recent letter and was particularly glad to hear that part II of the joint paper by Bohr and Rosenfeld made such good progress. However, he goes on to say that "there is one important point regarding the consequences of the quantum-electrodynamical formalism for charge- (and current-) fluctuations (positron-theory) on which he cannot agree with you: according to my opinion Heisenberg was entirely right in his claim of unsharp limitations of either the space or the time domain in which the charge (or current) fluctuation is considered in contrast to the case of energy (and momentum) fluctuation of the radiation (where a sharp limitation of the space-time region is sufficient to guarantee a finite value of the square of the mean value of the field strenght over this domain)". The letter also contains other scientific problems.