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 writes about a paper by Bohr and Mottelson.

Pauli writes on second thoughts about Fierz's results which for the case aT>>1 may be correct.

Pauli replies to Fokker's question and thinks it worthwhile to prepare an edition of Ehrenfest's collected work.

Pauli writes about von Steck's results in Heidelberg.

Pauli thanks Gagnebin for his letter on Lamarck. He expresses doubts on the significance of the concept of selection for the explanation of biological evolution. There exists no theoretical model for the assessment of the time scale evolution.