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

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 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 writes about a work by Uhlenbeck and Kahn. Pauli uses the V D Waals state equation in order to show that the thermodynamical considerations of Uhlenbeck cannot be correct. He hopes to come again to Holland. He writes about Heisenberg's difficulties with Stark and the Gestapo, and that Heisenberg requests that physicists abroad should support him. He writes about the necessity of jobs for dissmissed Viennese physicists.

Pauli apologizes for a mistaken criticism by Fierz on a theory by Uhlenbeck.