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Heisenberg writes about his discussions with Bohr on the "$\Gamma$-ray-microscope". He makes some remarks on Pauli's electrodynamical considerations, on the Hamiltonian interaction function between radiation and matter and on a paper by Darwin about Heisenberg's and Jordan's formulae.

Heisenberg writes about the Dirac-Jordan theory and Heisenberg's criticism of Bohr's objections.

Heisenberg continues his letter on ferromagnetism.

Heisenberg replies to Pauli's questions about his letter on ferromagnetism: 1) on the magnetic moments of the atom residues, 2) the case of paramagnetism, 3) the calculation of the state-sum.

The letter includes remarks on a paper by Pauli, on a second paper by himself on ferromagnetism for the Sommerfeld-Festschrift and on Dirac's theory.

Heisenberg asks if Pauli wants Peierls as his assistant. Heisenberg says that he wants Bloch to come to Leipzig.

Heisenberg asks questions about the theory of holes.

Heisenberg writes about Pauli's objections to his exchange-relations.

Heisenberg revokes his remarks made in the last letter.

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.