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

Pauli comments on Weizsäcker's article on Goethe's science. He writes about Goethe and alchemy, and he writes about intuitive type and mental type, and about mind, matter and psyche.

Pauli writes on physics and psyche, on a conversation with Jung on Albertus Magnus and Regiomontanus and the latter's interest in magic. He explains Jung's reaction to the fact that Cicero translated "atom" by "individuum".

Pauli regards Heisenberg's letter of 31 January as showing new progress. He talks about the mathematical difficulties of the Lee model and a general charaterization of the class of models with indefinite metric.

Pauli expresses great interest in Frauenfelder's experimental results. He formulates three independent questions concerning parity violation to which an experimental answer can be found in principle.

Pauli asks how Frauenfelder will test the exclusion principle for positrons.

Pauli is against the interpretation given by Princeton physicists to certain Beta-decay experiments and against the two-component theory.

Pauli refers to Preston's paper in the Canadian Journal of Physics which supports Pauli's criticism expressed in the last letter.