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".

The letter talks about some results of the application of "substraction-quantumelectrodynamics" to a higher approximation of the Compton-effect.

Pauli advises van Hove to treat his nucleon problem in a strictly relativistic way. This will change considerably the results concerning the magnetic moment of nucleons.

Pauli replies to a letter about affine field theory. Pauli explains why the unity of field theory is impossible, because the reduced curvature tensor splits into a symmetrical and antisymmetrical part, which can never be brought together again.

Pauli has received from Rosental a copy of Bohr's article for "Dialectica" and Bohr's letter. This article will be of great help to him to clarify the contents of other articles in the issue, particularly Bohr's definition of "phenomenon". It would be a great help for the general editorial comment on the whole issue, if Bohr could return to Pauli the proofs of Einstein's article and also drop him a line on his opinion about the remarks which Pauli made himself in his letter to Einstein (of which Bohr has a copy). Every criticism is welcome.