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Pauli adds an extract from a letter by Weisskopf about the Geneva conference . He has a positive attitude to Schwinger's last paper. He talks about a spinor-model by Gürsey where the neutrino and not the vacuum creates strangeness.

Pauli thanks Källén for his manuscript and letter. He makes a comparison of Källén's and Yang's results. He talks about results by Rohrlich for the case of charged scalar mesons in interaction with the quantized electromagnetic field. He also talks about results by Peasler and Kiroshita and about nu mber for charged vector mesons.

Pauli talks about identical results in papers by Thirring and by Hurst. He writes on the evaluation of a certain integral and on Peierl's method for the quantization of the form factor theory.

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.

Pauli writes on a question about the S-matrix in Lee's model. "Is it unitary?"

Pauli wants to write first to Lee before the proposed paper by Pauli and Källén is written. He writes on a definition of a "ghost state". He expresses doubts about the Tamm-Dancoff approximation in the case of more general systems. He makes some mathematical remarks.

Pauli thanks Källén for the manuscript. He writes about the Tamm-Dancoff method and some known negative attitude towards it. Small changes in the manuscript and the re-writing of the appendix.

Pauli has some more suggestions for minor changes in the paper.