Heisenberg talks about progress he made in his work on the Tamm-Dancoff method and the Lee model.

Heisenberg replies to Pauli's questions mainly about dipole ghosts.

Heisenberg discusses the connection of isospin with the duplication of the vacuum.

Heisenberg explains his objection to Pauli's suggestion as regards the communication relations. He suggests the publication of a preprint.

Heisenberg replies to Pauli's last letter about vacuum degeneration and about unitarity of the transformations.

Heisenberg writes of his progress as regards the eigenvalue problem. He writes about the contents of a preprint.

Heisenberg talks about the univalent definition of the Lagrangian by the groups and about the mirror problem.

Heisenberg writes about his trouble with the journalists and the statement he has made for the press. He talks about recent results of his calculations.

Heisenberg writes about the progress of his work, together with Dürr, Schliederand Yamasaki. They are going to describe the theory for nucleons and Pi-mesons. Heisenberg gives an explanation of their ideas.

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