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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.

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 expresses great interest in Frauenfelder's experimental results. He formulates three independent questions concerning parity violation to which an experimental answer can be found in principle.

Pauli asks how Frauenfelder will test the exclusion principle for positrons.