Pauli makes further remarks on Gürsey's formulation.

Pauli makes tentative predictions as to parity violation in certain interactions. He says that he has abandoned the application of isospin to leptons. He expresses disappointment over the formalistic approach of some physicists to

Pauli expresses satisfaction over Gürsey's idea to make the neutrino rather than the vacuum responsible for strangeness. He discusses several difficulties connected with the spinor-model.

Pauli sends a holiday travel plan in U.S.

Pauli suggests a meeting in Chicago.

Pauli wants to discuss hyperfine structure in Ann Arbor and will probably bring data from Schüler.

Pauli sends a circular letter concerning Heisenberg's paper on isospin. He explains why he withdrew his participation in Heisenberg's publication.