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Källén encloses a manuscript dealing with the contents of his last letter of the 12 December 1949, in addition to a calculation on bosons in an external field.

Källén talks about some general observations on the mathematical formalism of the Lee model.

Källén writes about his work on quantum electrodynamics and especially about renormalization.

Källén writes on an interim report on his work on quantum electrodynamics.

Källén criticizes Thirring's remarks about his theory communicated by Pauli.

Källén replies to two letters and questions about dipole ghosts. He talks about his own work.

Källén writes to Pauli from CERN and gives the results of his calculations on the probabilities of dipole states.

Källén replies to Pauli about his difficulties as regards the S-matrix.

Källén writes of the result of his calculation of the splitting of a dipole state in the presence of an additional N-particle.

Källén comments on the paper by Heisenberg and Haag. He writes on Wightman's axioms.