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Källén replies to Pauli's arguments in his last letters.

Källén justifies an objection he made on a theory by Pauli: the basic equations exhibit too strong a symmetry.

Källén thanks Pauli for an offprint of a paper by Pauli that is helpful for his calculations on the Lee model. He writes on the question of the unitary of the S-matrix in this model.

Källén writes about charge renormalization.

Källén talks about the difficulties of the indefinite metric in quantum electrodynamics.

Källén replies to Pauli's last letter. The normal pertubation theory cannot be used in the case mentioned by Pauli.

Källén writes on further doubts as regards the Heisenberg model.

Källén talks about certain results of his calculations on singular functions important for the analyticity properties of the n-fold expectation value.