Pauli is glad that Heisenberg's last letter of the 1st May has clarified the problem of frequency dependence of additional terms in Heisenberg's equation. He gives an outline of his paper for the Solvay congress.

Pauli discusses of form-factor theories, especially comparison of the Möller-Kristensen theory with those of Dyson and Schwinger.

Pauli writes in detail about Einstein's arguments against the usual interpretation of quantum mechanics: Einstein is against Bohm and De Broglie, but he believes that the statistical description of quantum mechanics is incomplete. He also writes about Einstein's "realistic metaphysics" and Pauli's attitude towards it.

Addition to the last letter of the 24 October 1934 (heisenberg_0205).

Pauli is interested in Heisenberg's new calculations on the hole theory and on the problem of magnetic nuclear moments.

Pauli replies to some points in Heisenberg's letters (18th April 1947 and 20th June 1947). The idea of an analytical continuation of the S-matrix is a failure. He is scepticalabout future theories, especially as the problem of the dimensionless constant e2/(n.c) is not solved. He doesn't believe in the existence of a universal length. He does not believe either in the mathematical existence of a convergent quantum electrodynamics with arbitrary e2/(n.c). He writes of his impending visit to Sweden and Copenhagen.

Pauli makes detailed suggestions for the writing of the "preliminary report" of their paper. He says that there are some points which still need clarification.

Pauli writes about the topic of his lecture to be given in Lund. He makes some remarks about scientists mixing in politics because he is against it.

Pauli writes about his forthcoming visit to Sweden.

Pauli asks for details about Gürsey's formalism with a non-degenerate vacuum. He enumerates several problems which worry him, e.g. mirror states, classification of elementary particles, etc...