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Heisenberg expresses his comments and doubts about Pauli's statistical theory. He has more throughts about velocity-position indeterminacy. He writes about his ideas on ferromagnetism and about intensity change in band spectra.

Heisenberg replies to some questions from Pauli.

Heisenberg writes about Pauli's remark on the interaction of the electron with itself and its consequences for the theory and on possible ways to eliminate the difficulty.

Heisenberg writes about the "Vertauschungsrelation" in the theory of holes.

Heisenberg makes some remarks on Fermi's paper. He writes on his matrix elements for pair creation and gives some calculations about the exchange energy of proton and neutron.

Heisenberg expresses doubts about the theory of holes; Pauli's schema is logical, but too complicated and a bit arbitrary. The questions are: "Are the expectation values for charge-and energy-density finite?" "Are the latter not occasionally negative?"He writes about the latest results of de Broglie and Joliot-Curie.

Heisenberg uses Dirac's method for the calculation of certain quantities. The concept of polarization of vacuum is not defined according to this theory.

Heisenberg replies to Pauli's questions on the possibility of calculating the total energy of matter created by the introduction of fields. He gives suggestions for the improvement of the paper and talks about Pauli's theory regarding the Klein-Gordon equation and the possibility of finding by this a method of field quantization, provided that modifications are introduced in the quantization rules of field, leading to spinors and Fermi-statistics. He writes about the scattering of light by light.

Heisenberg replies to Pauli's and Weisskopf's letters about the self-energy of the photon.

Heisenberg does not think that substraction physics makes sense. He writes about what he has learned of nuclear physics in Copenhagen, about the order of magnitude of exchange forces, and Bethe's suggestion to replace Fermi's relation for interaction by another. He writes about the explanation of all mass defects by a plausible exchange force and he belives that the theory of the positron and quantum electrodynamics should be brought in order before attacking nuclear problems.