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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.

Kaufman discusses properties of a determinant and invariance of his Lagrangian and he answers a question from Pauli.

Kemmer gives more calculations on the wave equation and makes a comparison with de Broglie's results.

Critical remarks from Kemmer about Bhabha's calculations on the neutretto-meson theory and remarks on the Bremstrahlung of the meson.

Kemmer gives a development of a convenient formalism for the wave equation, different from the usual representation of Dirac's Hamiltonian.

The letter contains some calculations on irreducible group representations.