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Heisenberg replies to Pauli and Källén, in particular about "Hilbert-space II". He makes some remarks on the physical contents of his mathematical formalism.

Heisenberg writes about the importance of his function $\chi$a(xx') for his quantized field theory.

Heisenberg replies to Pauli's question as regards the "Hilbert-space II" formalism, and the commutation relations on the light-cone. He also speculates about the importance of e$^{2}$/h.c.

Heisenberg attempts to justify his axiomatics and to show that it is less arbitrary than suspected by Pauli.

Heisenberg replies to a question by Pauli concerning certain equations in his last letter.

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.