Pauli writes about Mrs. Chang's prospective work in Princeton.

Pauli writes about possible topics of work for Mrs. Chang. He writes about the hopes for lifting of censorship of physics work in the USA. He writes about the possibility of printing the lectures he gave at MIT.

Pauli asks to the President of the Univ. of Sao Paulo for the reasons for arresting M Schemberg on the 30th March 1948 by the brazilian police.

Pauli advises van Hove to treat his nucleon problem in a strictly relativistic way. This will change considerably the results concerning the magnetic moment of nucleons.

Pauli reports on a model of Thirring's and about a modification of the Lee model, which avoids negative probabilities.

Pauli writes of Thirring's reaction to van Hove's letter.

Pauli discusses the question of the generalization of the Lee-model.

Pauli makes critical remarks on a letter by Villars. He writes about certain terms in a quantum electrodynamical work of Villars.