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 replies to Uhlenbeck's letter from 21 February 1941. He writes about beta-decay and meson-theory with zero spin for nuclear forces discussed by Oppenheimer. He writes about possibles subjects for his forthcomming talks in Ann Arbor.

Pauli writes about Christy's, Kusaka's and Schwinger's papers. He also writes about the world war.

Pauli writes about the world war and supports Uhlenbeck in these difficult times. He writes that he his invited to Lafayette's summer school.