Pauli talks about the edition of the Einstein volume. He is glad about Bohr's positive attitude as regards the issue of "Dialectica" on complementary. He also writes on entropy and observation.

About a special issue of the journal 'Dialectica' dealing with the concept of complementarity. W. Pauli requests a contribution from N. Bohr.

Pauli does not accept Caldirola's suggestion to connect experiments of Lattes, Occhialin and Powell with equations developped by Corben and Schwinger and gives two reasons for it.

Pauli thanks Hulthén for sending the French edition of Lagervist's work on the Lamb shift.

Pauli agrees with Casimir that quantum electrodynamics have entered a new phase and refers to the recently discovered fact that the magnetic moment of an electron at rest is somewhat larger than Bohr's magneton.

Pauli refers to some points for a future discussion with Fierz: 1) on the problem of divergencies in quantum electrodynamics 2) on the relation between concepts and sense perception. He also writes on the laws of nature as physical manifestation of archetypes and he refers to Kepler and his polemic with Fludd.

Pauli asks Jordan to send his cosmological works to Prof. Lichnerowicz at Strasbourg. He writes about Jung's interest in parapsychology. He has a negative opinion about a book by an American psychologist, E White, on the "Unobstructed Universe".

Pauli sends Fierz some critical remarks on an article written by Schrödinger who is not ready to accept the epistemological consequences of quantum mechanics. He also comments on Fierz's statement by an "arbitrary decision of the observer".