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Källén sends some details of his work (together with Pauli) on Lee's model of a renormalizable field theory.

Källén gives details of the mathematical technique of his work on quantum electrodynamics.

Källén discusses aspects of his theory on mass spectrum, and also the properties of functions. He makes some personal remarks about Jouvet.

Källén writes from CERN on the discontinuous character of the S-matrix for the transition to the dipole ghost.

Källén replies to Pauli's second question in his letter of 23 January.

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.