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Pauli sends a list of people to whom preprints of their paper should be sent. He comments the reaction of Heisenberg and his pupils to the paper.

Pauli writes on the non-physical ("pathological") solutions of quantum electrodynamics in case of strict validity of Lorentz-invariance. The mathematical consequences of this: "ghosts" and macroscopic acausalities and the postulate that for large photon- and quantumnumbers of electrons the classical theory must result as limiting case of quantum electrodynamics. One has to look if the equations of quantum electrodynamics have solutions which fulfil these three consequences.

Pauli writes of his going to the conference in Pisa where he will discuss Källén's letter. He talks about Landau's papers whose general gist is like that of Källén's and about his doctoral student Enz and his work.

Pauli talks about offprints of their common paper.

Pauli asks him to send a copy of his work to Heisenberg. He mentions an error found in Heisenberg's paper.

Pauli talks about a manuscript sent by Heisenberg and a question whether unitarity of S-matrix, commutativity of field-operators and regularity of commutators on the light-cone can be fulfilled in the case of abandoning a positive-definite metric. He writes about Wightman's axioms and their inapplicability to physics.

Pauli asks questions about a paper by Nishijima.

Pauli suggests a note correcting the results of Nishijima. He questions whether Heisenberg's description of physical scattering processes in the Lee model comes to grief through discrete states of negative norm or of complex energy He also asks whether "Heisenberg-models" can be constructed for which the unitarity of the S-matrix is preserved in an indefinite metric of the field-operators?

Pauli discusses the communication problems he has with Springer.