Heisenberg writes about his new results about the nature of the $\Pi$-meson. He writes about the reformulation of their preprint.

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

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 suggests an outline for a common paper to be published by Pauli and himself.