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Pauli mentions the recent results about the magnetic moment of the free neutron and adds a lengthy theoretical comment to this.

Pauli writes about longitudinal photons. The principle of "renormalization" of charge and mass works satisfactorily only in special interactions. Another question: will it be necessary to modify the space-time concept for small dimensions?

Pauli is looking forward to reading Jauch's forthcoming book on electrodynamics. He would prefer not to read the book in the proof-state, for this means a certain responsibility.

Pauli discusses the properties of spin matrices and efforts toward a quantum electrodynamics.

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 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 writes on additional calculations about Jordan's theory of gravitational constant.

Pauli gives some details about the confor-transformations in Jordan's field equations.

Pauli writes on the concept of chance in biology and on the lack of a quantitative definition of biological probabilities. He suspects that the present conception of evolution is still essentially incomplete. The two parameters of selection and mutation are logically independent of each other. It is not the gene that is thesmallest unit of life but the cell as Bohr has emphasized.

Pauli replies to three questions of Jordan: 1) on heat conductivity, 2) on his possible visit to Hamburg, 3) on a problem which Delbrück might be able to answer.