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Heisenberg talks about a paper by himself and Ascoli on the fine-structure constant. He comments on a paper by Källén and Glaser in which the V-particle of the Lee-model becomes radioactive, disintegrating into N and $\Theta$.

Heisenberg talks about his recent results giving tentative proof that in all sectors of the Lee model with dipole ghost the S -matrix is unitary.

Heisenberg writes on clarification of the question of the existence of a solution for the integral equation containing a simple pole. He gives his opinion on Källén's calculations.

Heisenberg remarks on Pauli's letter of the 25 and the 27 December, especially on invariance properties of the group.

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

Heisenberg replies to some of the questions raised in Pauli's last letters (of 3 and 4 March.

Heisenberg expresses his regret at Pauli's letter telling of Pauli's withdrawal from the work. He gives additional comments on the results. He does not want to publish the pre print if Pauli does not appear as co-author.

Heisenberg writes about Weisskopf's calculations regarding self-energy.

Heisenberg replies to Pauli's critical remarks about his last letter.

Heisenberg writes on the quantization of the outer electron of an atom on weak external magnetic fields and in increasing fields until the Paschen-Back-effect.