Bohr discusses the "Gospel of the magnetic electron". He writes that Kramers has confirmed Pauli and Heisenberg's calculations. Bohr is still hoping for a correspondence agreement. Kramers made a guess as to the relativistic and magnetic corrections, the relevant formulae are given in the letter.

Bohr has sent a manuscript with the preparation of his discussion remarks from Brussels to Langevin. He is sending now another copy to Pauli and he would be very glad to hear his opinion before he gets the proofs. Bohr and Rosenfeld are eagerly awaiting the promised article with Weisskopf. He need not say how pleased he was to hear that there is a possibility of a visit by Pauli to Copenhagen in Spring. Perhaps Heisenberg and Dirac will come too. Bohr's own journey to Russia should take place in the beginning of May, and Margrethe and Rosenfeld will accompany him on the journey.

Bohr explains that he has not yet answered Pauli's letters and cards because of a lack of interest in Pauli's questions concerning his calculations of scattering of high frequent radiation from bound electrons. During the last week he has thought much about it and discussed it with Bloch. He also has some remarks about it and he would like to know Pauli's opinion.

Bohr was glad to receive Pauli's article which gives an excellent account of Einstein's pioneering work in quantum theory. Bohr does not know what to answer to Pauli's questions concerning some changes Bohr should make in his paper. The detailed account of the discussions which he had first planned turns out to be much too long for the occasion. Therefore, he is trying to confine himself to the general epistemological aspects of the attitude taken in the discussions, and he has started on a much shorter article which he hopes to have ready very soon. In a few days Bohr will write to Pauli again and tell him how things stand so that it can be decided how to make the best out of it all.

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.

Bohr has heard that Pauli developed new thoughts on the mystic of relativity in the atom theory and is asking for some developments.

Bohr apologizes for not answering Pauli's letters from last summer. He is glad to hear that Pauli is rather satisfied with life in general and with his own work. Bohr writes that Pauli should not look uncritically at the endeavours of his friends. He also felt that Pauli had read Bohr's Faraday lecture and Rom-discussion in the same way as "the devil reads the Bible".

Bohr thanks Pauli for his letter which gave him a welcome occasion for a small heart-outpouring. He has recently returned to his old primitive view on the problems of the electron theory after having been alarmed by Pauli's difficulty with the infinite self-energy of the electrons.

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.

The letter encloses a paper by Jordan published in: Z. Phys. : 44 (1927), pp.473. Bohr discusses it briefly and refers also to Klein's work. Bohr has not yet finished a "small note". He refers to Pauli's visit.