Pauli's letter deals with contributions, received and not received from physicists of various countries to the Bohr-issue. He talks about an invitation to visit Russia.

Pauli refers to a discussion he had with Born, Klein and Kirkwood. He also describes his own objections to a talk given by Born during a conference in Florence (properties of a certain operator). The letter touches briefly on other matters, including Born's theory of reciprocity.

Pauli declines Born's proposition to become a member of a "political party with a red stamp" or to sign "any open letter". Instead of taking part to a East-West world division, Pauli would more encourage a synthesis between asiatic wisdom and occidental sciences, which is more application oriented. He gives some thoughts on the behavior of a scientist on political questions. He also talks about his interest in Fröhlich's theory of supraconductivity.

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 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 about details of an article by Caldirola on the experimental verification of the relativistic time dilatation.