Pauli writes about two problems: The H-theorem and five and higher dimensional field theories.

Pauli writes about his travel plans to the Cagliari physics congress.

Pauli hopes that Klein will come to Zürich.

Pauli sends a quotation from P Bergmann's book on relativity, concerning gravitational waves. He writes on the roots of mathematics in the Unconscious, with special reference to the Pythagoreans.

Pauli makes a commentary on, and an addition to, Fierz's lecture in the psychological club. He writes on: 1) Alchemy versus Platonism, God as root of both good and evil 2) the mystical element in Plotinus 3) the concept of "privation" in ancient philosophy of nature. Matter as the manifestation of evil

Pauli hopes that Klein will be present when he will the Pais' w-space.

Pauli writes about his trip to Princeton. He makes remarks on H-theorem and quantum statistics.

Pauli asks Thellung to send him a paper about time reversibility.

Pauli thanks Delbrück for the copy of his lecture. He hopes that biology will soon have a development analogous to that of physics from 1900 - 1905. He is interested in processes in living organisms which cannot be explained by quantum mechanics. There may exist in living organisms, besides statistical laws, an additional interdependence which might explain biological evolution.