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.

Pauli recommends Schafroth for a new post in Basel.

Pauli makes critical comments on Fierz's last letter and his calculations. He writes on speculations about C-, P-, T-invariance. Possibly it is not the strength of the interaction but primarily its form which determines C-, P-, T-invariance.

Pauli is against Heisenberg's approach to quantum electrodynamics. It is impossible to work only with energy-momentum values and the S-matrix and to disregard space and time. He talks about some clarifications on his own last letter but one. He writes on the separation of purely mathematical quantities from physically significant ones.

Pauli makes mathematical remarks about the particles resulting from a spinor model. He writes on the electrodynamical aspect of his calculations. He is against the publicity given by Heisenberg to his "world-formula".

Pauli writes on his timetable for the next two months. He talks about the manuscript of Heisenberg's lecture on Planck, on Fierz's calculations. If one introduces an indefinite metric (e. g. the Lee-model), one has to expect an integral equation for the field.

Pauli writes about a paper by Bohr and Mottelson.

Pauli talks about Fierz's letter to Enz and the error in Fierz's calculation.