Pauli asks Bohr about the conference in Lindau. He is not sure if he wants to take part or not. Partly because he is travelling a lot and because he dislikes the publicity around these lectures. He expresses his great interest in Bohr's activities.

Pauli comments on a philosophical manuscript by Fierz concerning the methods of classical physics and of quantum physics.

Pauli replies to Källén's letter of the 3 October 1956. He writes about a proof by Symanzik concerning dispersion relations.

Pauli writes of another possibility of mixing Hamilton functions in special reflections.

Pauli makes some suggestions for a seminar talk to be given by Fierz.

Pauli makes historical remarks on Fermi's beta-decay theory and on the neutron. Pauli talks about his paper on paramagnetism (in: Z. Phys. : 41 (1927), pp.81) and about Dirac's statistics (Proc. R. Soc. Lond., A : 112 (1926), pp.661).

Pauli talks about a letter he received from Heisenberg about his recent considerations regarding the Lee model. The problem is where does the unitarity of the S-matrix fail in the case of indefinite metric.