Pauli fixes a convenient time for Kronig's visit to Zürich. He writes about a lecture he will give in Turin.

Pauli refers to Einstein's article in the de Broglie volume and rejects his conclusion that the results of quantum physics are not complete.

Pauli writes about his trip to Copenhagen and Leyden. He sends a manuscript of his lecture "Wahrscheinlichkeit und Physik" which he has given at a congress on probability and statistics in Zürich. He also mentions de Broglie's new paper.

In connection with a planned lecture on cosmological problems of the theory of relativity Pauli asks for clarification on several points in Jordan's book.

Pauli makes several criticisms of Jordan's book.

Pauli reports in detail on Pais' lecture in Holland on "isotopic spin and mass quantization" and on his introduction of the "W-space". Pauli writes about Jordan's cosmological equations. Pauli thinks that Einstein's model is simpler and more convincing. He does not see the advantage of the introduction of a changing gravitational constant. The appendix contains ideas about the statistical theory of heat.

Pauli writes on the subject of a lecture he is going to deliver. He makes more remarks about Pais' work.

Pauli requests reprints of Wergeland's latest work for a letter of recommendation.