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Heisenberg gives detailed calculations to show that their simple method of incorporating the theory of holes into quantum electrodynamics leads to good results.

Pauli indicates a weakness in Dirac's theory.

Heisenberg writes on the final results of the theory of holes. The whole scheme can be transposed into the quantum theory of waves. He talks about signs of a deeper connection between matter-field and radiation-field.

Heisenberg agrees with Pauli's calculations avoiding spin with Bose-statistics. The assumption that a single particle (electron) must be a trivial solution of quantum electrodynamics, should lead to spin with Fermi-statistics. The question is what kind of quantized wave theory will obey the following postulates: the number of particles corresponding to the waves is not necessarily constant, relativistic invariance, a single particle as trivial solution of the equations and energies are always positive.

Heisenberg makes some remarks on Pauli's and Weisskopf's theory. The infinite polarization of the vacuum is the result of certain parts of the quantum-theoretical formalism which need corrections.

Pauli makes an analysis of his own psychological state during recent years. He comment on a book by Buber which Kronig has sent him. He is impressed by Buber's subject-object philosophy and regards the concept as a fundamental one.

Pauli replies to Born's question about a possible publication in Helv. Phys. Acta. He expresses his interest in some results (spin) of Born's field quantization.

Pauli writes of his discussion with Weisskopf about Heisenberg's letter to the latter. The result is electrical polarizability of vacuum and self energy are analogous phenomena. The perturbation formalism of substraction-physics can lead to the removal of these phenomena.