Pauli comments on J. Leite Lopes' letter of 12 August 1944, and in particular the integral operators used by Lopes.

Pauli asks two questions concerning a work by J. Leite Lopes, one about the use of the angular momentum-integral, and the other about the necessity of an additional term in an equation by Schrödinger.

Pauli comments on calculations by J. Leite Lopes.

Pauli comments on a report by J. Leite Lopes.

Pauli has just received J. Leite Lopes' paper "On the particle picture of quantized Bose Fields I", and mentions two relevant papers by Dirac, which Lopes did not quote.

W. Pauli thanks A. Löwy for having lent him literature on biology, especially two works by R. Goldschmidt. Goldschmidt considered as a 'mystic of hazard'. Comments on his thinking. Pauli mentions that he has joined his own translation of a letter by Bohr.

About biology. W. Pauli comments on the thinking of C. H. Waddington ('The evolution of adaptation'), R. Goldschmidt and Simpson.

Pauli replies to Lüders' letter of 30 June. He makes remarks about anticommutation of different spinor fields.

Pauli writes about parity-violation. Includes an appendix about two-component theory.

Pauli acknowledges Lüders' comments on his Bohrfestschrift article. He writes of his study of Lee's paper (in: Phys. Rev. : 95 (1954), pp.1329) and of some improvements he could make on it.