Pauli expresses his doubts about Lopes last results, because of the inconsistency of the pertubation method used by him. He mentions similar difficulties in previous work by other authors.

Pauli is glad that the difficulties in Lopes' work have been overcome. He adds some more remarks about the regularity of integral operators.

Pauli asks Jauch to send him certain data concerning particles with higher spin.

Pauli writes about his decision to stay in Zürich and about the negotiations with Swiss authorities, and also about his impression of the scientific level of Swiss physics. He writes about the first European Physics conference after the war, in Cambrigde.

Pauli received an elaboration of Jauch's lecture.

Pauli writes about his renouncing the partnership with Heisenberg. He thinks there are mistakes in Heisenberg's integration of his equation. Futher, if one attempts to loosen either the causality or the unitarity of the metric, this leads to disastrous results in relativistic theories. His impression is that one has to wait for new physical ideas, because mathematical virtuosity alone cannot lead to the discovery of new laws of nature.

Pauli requests a starting point for discussion on self induction.

Pauli comments on calculations made by Jauch. He writes of a letter from Bhabha (Bangalore) about the spin of the mesons. He comments on rumours about Heisenberg's idea of a fundamental length. Pauli is sceptical because he sees no connection with the atomicity of the electric charge.

Pauli discusses a work by Wilson on the influence of damping on the brems-radiation of mesons with spin 1.

Pauli gives more adresses of people asking for offprints of Pauli's paper on meson theory.