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Bohr discusses Goudsmit and Uhlenbeck's work published in: Nature : 117 (1926), pp.264. Thomas has explained the missing factor of 2 by calculating the relativistic motion in: Nature : 117 (1926), pp.514. Thomas' note is enclosed.

Bohr does not agree with Pauli's and Heisenberg's criticism of Thomas' work in: Nature : 117 (1926), pp. 514. He discusses the problem in detail and asks for further comments from Pauli.

Bohr is on vacation in Arosa with Harald. He hopes to see Pauli when coming through Hamburg on their return and will talk about Pauli's planned visit to Copenhagen. Bohr has sent an entirely new manuscript to Berlin for "Naturwissenschaften : 16 (1928), pp.245".

Bohr will pass through Hamburg together with Klein on their way to Holland. He hopes that Pauli will join him on his way back to Copenhagen.

Bohr has sent proofs from Holland to Berlin for "Naturwissenschaften : 16 (1928), pp.245" but he is still expecting his last proofs. He hopes to see Pauli in Copenhagen. He has enjoyed seeing Kramers and Ehrenfest in Leiden. He is preparing his opposition to Jacobsen's thesis. Klein is still in Cambridge.

Bohr has been thinking of writing to Pauli since the appearance of the Sommerfeld Festschrift, but the letter grew in bulk into a paper, which is not yet finished. Klein is working on relativity problems and is very hopeful about his work for: Z. Phys. : 53 (1928), pp.157".

Bohr writes that at the institute's birthday they all missed Pauli. Bohr's thoughts went out to the old collaborators, including Pauli, who supported him patiently in his endeavours. He thanks Pauli for the invitation to come to Zürich and to give a lecture. He heard through Gamow that Pauli was in Berlin, so he hopes that he will come to Copenhagen and have the opportunity to speak a little about physics. Bohr also writes that he thinks that he has reached a valid view diverging from Peierls' and Landau's scepticism. After Klein's departure, Bohr has found in Rosenfeld an excellent and sympathetic collaborator. He hopes in a few days to finish a small article that should please Pauli.

Pauli's last letter was in every respect a cause of great pleasure to Bohr. First of all Bohr and his wife sends Pauli their heartiest congratulations on his approaching wedding and they look forward to having Pauli and his wife on a small visit in their home. The week after Easter would be very suitable, and Bohr hopes that they will feel comfortable in Carlsberg in spite of the columns. Both Rosenfeld and Klein, who is in Copenhagen on a visit, as well as Bohr, were very interested in Pauli's remarks. Bohr will take Pauli's proposals into consideration when the proofs arrive. The unknown author of the first appendix writes that he agrees very much with the contents of Bohr's manuscript and his letters to Pauli. By contrast his view about the problem of the infinite self-energy is somewhat different from what Bohr writes on this subject.

About Bohr's and Rosenfeld's work on measurability and Heisenberg's calculations.

Bohr thanks Pauli for his congratulations on his 65th birthday. He writes about the double role of a human being as an observer and as an actor in the theatre of life. He also speaks of the preparation of an article on free will and life, and of a book based on his Grifford lecture.