Pauli returns to a problem discussed at the Florence conference concerning irreversibility and the H-theorem.

Pauli replies to a question about eigen-states of particles with an "anomalous" magnetic moment in a magnetic field.

Pauli does not accept Caldirola's suggestion to connect experiments of Lattes, Occhialin and Powell with equations developped by Corben and Schwinger and gives two reasons for it.

Pauli refers briefly to a paper by Sachs on the magnetic moment of the deuteron.

Pauli suggests that he could visit Caldirola in Milan on his way back from Venice and Padua.

Pauli will seriously consider sending an invitation to Dr. Dell'Antonio, whom Caldirola recommends.

Pauli asks for a reprint of Casimir's paper on microcospic reversibility in connection with a lecture on problems of the statistical theory of heat.

Pauli agrees with Casimir that quantum electrodynamics have entered a new phase and refers to the recently discovered fact that the magnetic moment of an electron at rest is somewhat larger than Bohr's magneton.

Pauli gives an impression of his visit to Stockholm and Copenhagen on the occasion of his Nobel-lecture. He regrets that an exhibition of Kelder's sculptures cannot be arranged in Zürich.