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This letter from Casimir is accompagnied by an offprint by Casimir and B L van der Waerden "Algebraischer Beweis der vollständigen Reduzibilität der Darstellungen halbeinfacher Liescher Gruppen" (in: Math. Ann. : 111 (1935), pp.1-12). The letter contains a short reference to mathematical problems, experimental results on supraconductivity and personal remarks on Kronig.

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 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.