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Heisenberg comments on Neumann's manuscript. He is convinced that the correct quantum wave theory will only be found after the introduction of a universal length. He corrects his statement in the last letter about the state described by the Thomas-Fermi method.

Heisenberg writes about the consequences of a Delta-interaction in the case of a finite number of particles. This interaction exists only for point-energy show that the "shape" of the electron in quantum electrodynamics is represented by the properties of the density matrix. He writes on a possible semi-classical interpretation of Fermi's theory. He writes about the idea of the Americans that forces between all heavy particles are equal, and some consequences of it. On Euler's application of the Hertree-method to heavy nuclei and the resulting improvement of results.

Heisenberg talks of results of calculations about their model: lack of relativistic invariance. He gives suggestion for a new model, defined by another Lagrange-function and some comments on the recent ideas about nuclear forces.

Heisenberg comments on Bloch-Nordsieck's paper. It would be worthwhile to calculate the end of the spectrum. From papers by Anderson, Neddermayer and Blackett it seems to follow that particles exist with masses intermediate between electron and proton, and this is a plausible result. On Cosmic radiation, he says that very great showerscannot be explained by the Bhabha-Heitler formula alone.

Heisenberg hopes that "Nature" will reply to Stark's article. He talks about the possible reasons for the asymmetry of Beta-ray-spectra.

Heisenberg replies to Pauli and Källén, in particular about "Hilbert-space II". He makes some remarks on the physical contents of his mathematical formalism.

Heisenberg writes about the importance of his function $\chi$a(xx') for his quantized field theory.

Heisenberg replies to Pauli's question as regards the "Hilbert-space II" formalism, and the commutation relations on the light-cone. He also speculates about the importance of e$^{2}$/h.c.

Heisenberg attempts to justify his axiomatics and to show that it is less arbitrary than suspected by Pauli.

Heisenberg replies to a question by Pauli concerning certain equations in his last letter.