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Pauli agrees with Heisenberg's pessimism regarding infinite energies, but he thinks one should try to separate the problem of self-energy from that of the hole theory.

Heisenberg gives new calculations about the theory of holes. He writes about the gauge-invariance of certain expressions, about the problem of self-energy. he talks on the necessity for theories with infinite degrees of freedom and a quadratic wave equation should be possible in the case of absence of external fields.

Heisenberg replies to Pauli's letter. He is now satisfied with the state of the theory of holes. There are two problems. The first is what kind of Schrödinger equation characterizes the theory of holes and what are at any moment the expectation values for current and charge-density. The second problem is what are the expectation values for the energy-density. He discusses the solutions for both problems. If Pauli agrees, he would like to publish the theory of holes in the present form. He is grateful for Pauli's criticism of his attempts to solve the self-energy question.

Pauli does not believe that the theory of holes can be improved without essentially new ideas.

Heisenberg gives a few corrections to the last letter.

Heisenberg sends a manuscript describing the present situation of the theory of holes. He expresses the hope that the way from this theory to the explanation of $^{2}$/(h.c) will be short.

Pauli writes of Weisskopf's and his own result that the material energy of photons becomes infinite in their theory. He remarks about "substraction physics": the fact that polarizability of the vacuum and self-energy of material particles are both becoming infinite must have a common root. The real progress of the theories will be found in the amalgamation of electromagnetic field and matter field.

Addition to the last letter of the 24 October 1934 (heisenberg_0205).

Heisenberg talks about his attempts to find the value for e$^{2}$/(h.c.) by a suitable holes theory.

Pauli is interested in Heisenberg's new calculations on the hole theory and on the problem of magnetic nuclear moments.