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Heisenberg writes more about the theory of holes and about another method for the elimination of an infinite charge density.

Heisenberg asks some questions in connection with Pauli's letter. One of Heisenberg's assumptions for space-like vectors is incompatible with the differential form of the conservation laws, and the latter has to be renounced which makes sense. He gives some remarks about Fermi's paper and the interaction introduced by him.

Heisenberg replies to Pauli's letters. He writes about a future formulation of field theory, where matter and radiation fields will appear as different properties of the same field. He talks of Pauli's remarks that the exchange relations of electrical and magnetical field strengths have to be modified.

Heisenberg writes on a talk Heisenberg had with Bohr about the theory of holes. The reason why an arbitrary small value of e$^{2}$/(h.c.) is not realized in nature is given by two deviations from Maxwell's theory which are identical in principle that dependent on pair production and that connected with the deviation from linearity and connected with finite self-energy. He talks on further considerations by Heisenberg. One Hamilton - electron and photon.

Heisenberg talks again on the physical meaning of certain terms of self-energy, the problem of the relativistic invariance of self-energy, and Weisskopf's calculations.

Heisenberg writes about Pauli's result that the Balmer-terms must suffer a shift if parameters are smeared out over a domain ~h/mc. He talks on serious deviations of the present theory from reality.

Heisenberg replies to Pauli's letter about two alternations of proceeding with the theory. He writes about a difficulty in the theory of continuous X-ray spectra and its possible solution.

Heisenberg writes about the Uhlenbeck-Konopinski theory of Beta-spectra and a possible relativistic invariant formulation. He also writes about Bothe's refutation of a paper by Shankland, and about a simple model of a non-linear wave theory without universal constant, except c, containing only a pure number to be identified with e$^{2}$/(h.c.).

Heisenberg replies to Pauli's letter, which convinced him that the infinity of the energy values is unavoidable, and that this is connected with shower production. Probably the whole quantum theory of wave fields is wrong. Neumann's suggestion is a possible way out of the dilemma.

Heisenberg thinks that his description of the lowest state (vacuum) is correct, but he does not yet understand how particles as higher states result from his mathematics.