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Heisenberg encloses a manuscript discussing certain properties of the propagation function of the non-linear wave equation. He asks for Pauli's opinion.

Heisenberg explains certain formulae in the manuscript on quantum electrodynamics. He replies to questions by Pauli on the symmetry of conservation laws, on a stronger approximation to Pauli's and Jordan's formalism and on the meaning of certain values for the self-energy of particles.

Heisenberg writes on excitation times and line widths.

Heisenberg asks for Pauli's opinion on his Zeeman effect paper.

Heisenberg writes about progress in quantum mechanics, Born's and Jordan's contribution and mathematical representation of the new formalism.

Heisenberg writes about the quantum conditions for several degrees of freedom.

Heisenberg thanks Pauli for his book (Hand-Buch-Article). He writes against Schrödinger's conception which throws all quantum theoretical phenomena over board and about Wien's agreement with Schrödinger's attitude.

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.