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.

Pauli gives his views on mutations and selection. He makes remarks on Klein's work and Heisenberg's attempts at a unified field theory. Pauli makes plans for a relativity congress.

Pauli asks for classification of Klein's work.

Pauli criticizes Klein's notation and a commutator relation. He refers him to Rosenfeld (1930).

Pauli reports his coming absence in case Klein's third draft arrives then.

Pauli writes about his plans for his visit to Sweden.

Pauli makes critical comments on Kofoed-Hansen's papers about the neutrino.

Pauli asks if Bohr could go through Heisenberg's manuscript dealing with a new conception of the Zeeman-effect.

Pauli writes about the Lorentz transform of the magnetic moment. He suggests a non-relativistic example of Thomas term.