Pauli writes about Kramer's death and the "shadows" in the last years of his life.

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

This letter is an addition to the letter of 15 April.

Pauli talks about the integration of Maxwell's equations in Schrödinger's ringcoordinates.

Pauli comments on the treatment of a certain integral. He writes about the structure of a future theory which will describe simultaneously all elementary particles and their masses.

Pauli writes about his essays on Kepler which will be finished shortly.

Pauli advises Klein on improvements to his Bohr-Festschrift article. He reports on receipt of Landan's article. Pauli makes remarks on Soviet contacts with the West.

Pauli makes editorial remarks on Klein's article. He reports on his trip to Holland.

Pauli writes about thermodynamical irreversibility and quantum theory. He makes remarks about Pais' work and his W-space, about quantum field theory and about the analogy between the electromagnetic eigen-field of an electron and the gravitational eigen-field of a photon.