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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.

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

Heisenberg talks of more progress about e$^{2}$(h.c.). He also writes of a solution of the Schrödinger equation in the present theory of holes by a power-series of e$^{2}$(h.c.).

Heisenberg writes on a typical difference betwen quantum electrodynamics and Fermi's Beta-Decay theory. The existence of cosmic ray showers can possibly be explained by Fermi's theory. He gives numerical calculations.

Heisenberg talks about some plausibility arguments against Pauli's objections and about a possible solution for the interaction of neutrinos in the case of many particles. He writes about an application of a kind of Thomas-Fermi-method for the state of lowest energy. From this interaction the production of showers can possibly follow.

Heisenberg gives a description of the present situation of the field-theory. In a more complete future theory there will exist no particles smaller than the universal length, and the divergences of the present theory will be avoided. He writes about more considerations about nuclear theory. The pair production observed up to now can only be interpreted as internal emission. About an experimental paper on shower production in great depth.

Heisenberg talks more about cosmic radiation at great depths and Heisenberg's conjecture that it consists of neutrinos. He continues his calculations with the new formulation of the quantum theory of waves. It leads to relativistic and convergent results, but energy and momentum integrals are not known because of the lack of a Hamiltonian.

Heisenberg writes about his marriage and gives more results about his attempt at convergent wave quantization: appearence of new infinities which cannot be avoid without loss of relativistic invariance. He talks about cosmic radiation: it seems as if his hypothesis of the neutrino origin of showers can be confirmed. He also talks about recent papers about the number of showers as function of layer-thickness.

Heisenberg talks about a letter by Blackett and his experiments about energy loss in Cu plates. He speaks of the possibility of the existence of heavy particles in the showers. He writes on Heisenberg's considerations about explosions in and the existence of a universal length.