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Heisenberg asks about the formulation of the difference between $\Psi$* and $\Psi$+ in the Dirac theory, with reference to the operator $\eta$.

Heisenberg agrees with Pauli that one cannot make the S-matrix alone a starting point of a quantized field theory. There is discussion of other possible presuppositions.

Heisenberg talks about the meeting of the Nobel prize winners in Lindeau. He writes about progress in his model theory.

Heisenberg has found that as regards the N + 0 - problem the Lee model deviates considerably from reality.

Heisenberg makes a comment on the case of 2N+$\Theta$.

Heisenberg gives more calculations about zero-vectors and dipole ghosts.

Heisenberg gives more calculations about dipole ghosts and the unitary character of the S-matrix.

Heisenberg is glad about Pauli's agreement with him as regards the procedure for obtaining convergence. He makes a clarification of a further point and comments on the parity question.

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.