Pauli replies to Fierz's letter about Regiomontanus and his mathematical work. Pauli attempts an interpretation of his dream about Regiomontanus.

Pauli writes in detail about Einstein's arguments against the usual interpretation of quantum mechanics: Einstein is against Bohm and De Broglie, but he believes that the statistical description of quantum mechanics is incomplete. He also writes about Einstein's "realistic metaphysics" and Pauli's attitude towards it.

Pauli writes about the date of a conference in Mainz where Pauli intends to lecture on "Die Wissenschaft und das abendländische Denken". He plans to write a paper on "Exclusion principle, Lorentz group and reflexions of space-time and charge".

Pauli writes about a letter written by Schafroth who suggests an explanation of supraconductivity. He comments on a discussion on evolution in a meeting of biologists, in which Pauli participated and on the reasons for the resentment of physicists by biologists.

Pauli talks about Fröhlich's reaction to Schafroth's paper. He comments on Feynman's paper.

Pauli talks about a confusion in Källén's calculations in the last letter.

Pauli has more thoughts about the Lee model. He asks Källén to work out the free-of-infinities formalism and gives an indication how to do it. He asks about a generalization of the method of Cauchy's integral-proposition for quantum electrodynamics.