Heisenberg writes on an invariance property of the ghost solutions.

Heisenberg talks about the arguments of the Japanese physicist Kita. He is against Pauli's rejection in principle of infinite metrics in the Hilbert-space. He writes on his own optimism as regards the present state of field physics.

Heisenberg believes that the whole electrodynamics can be derived from his model, giving a definite value for e$^{2}/h.c.

Heisenberg talks about the generation and elimination of ghost-states, with special reference to his own theory.

Heisenberg writes of the results of his latest calculations. The non-linear interaction leads not only to the vanishing of the o-functions on the lightcone but also to vanishing of the transitions to the dipole states (limes of dipole ghosts).

Heisenberg asks Pauli's advice as regards the 2N+$\Theta$- problem which again is not clear to him.

Heisenberg argues against the calculations of Pauli in his letter about the solution for a simple pole.

Heisenberg gives more explanations of what he calls the group property of the Hilbert-space I.

Heisenberg replies to Pauli's remarks on the special mathematical questions and on the general questions, in particular with reference to Wightman's paper, and with reference to the parity problem.

Heisenberg talks about Thirring's model and tentative results of Heisenberg's recent calculations.