Pauli makes a suggestion concerning the ergodic problem and he also writes about a meeting he had with Pryce in Varenna.

Pauli discusses the relation between reactions of mesons with neutrinos and the beta-disintegration of nucleons. Pauli added some information to this letter in a second letter dated the same day (fierz_0092-175).

Pauli discusses some probelms of beta-disintegration, with special referecne to the "Fierz-terms".

Pauli writes on the importance of a paper by Coester, published in: Physical review: 83 (1951), for the problem of the transition from neutral vector mesons to quantum electrodynamics. He explains the connection of this paper with that of four Japanese physicists, published in: Progress of theoretical physics: 6 (1951) on the possibiliy of avoiding indefinite metric in Hilbert-space in quantum electrodynamics.

Pauli writes on a correspondence with Heisenberg on his ideas on field quantization.

Pauli makes a critical comment on Fierz's paper on Jordan's theory.

Pauli makes a comment on Fierz's letter. He writes that equations which cannot be derived from a variation principle must fail in the end, both in the mechanics of points and in classical field theory. He speaks about a book by Jordan and he speculates on the origin of life. Pauli suspects that its first beginnings are non-reproductive phenomena like Jung's "synchronic" phenomena.

Pauli writes on the recent experiments by Gorter and by Frauenfelder. He talks about a theoretical paper by Touschek and suggests to Fierz that he publishes his work on the isomorphism of the Majorana-theory theory.

Pauli makes detailed comments on a paper by Salam which on the whole is regarded by Pauli as an important step forwards.

Pauli writes on recent parity-experiments by Garwin and Lederman and by Deutsch. It seems that the two components theory is not correct.