Pauli welcome's Jauch's impending appointment in Princeton University and gives advice as to the negotiations about working conditions. Enough time for research is vital. He comments on the difficult paper by Dirac. He suggests a problem in the same area (application to "infra-red catastrophe"). He writes of his plans for a joint investigation with Kusaka about application of the strong-coupling formalism on a mixture of mesons of zero spin and spin 1 (Rosenfeld-Möller theory).

Pauli writes about offprints to be sent to certain adresses in Europe. He comments on Lopes' dissertation and gives some advice about the proper personal contact with elder colleagues.

Pauli writes more about his offprints.

Pauli mentions "artificial" mesons created by accelerators and the possibility of their identity with cosmic ray mesons. He gives some comments on Jauch's work. He writes that Anisotropy of scattering cannot be explained by Delta-function.

Pauli writes the first letter of welcome for Jauch's arrival in the U.S.A. He comments on the "cut-off" technique in theoretical physics.

Pauli asks Jauch to send him certain data concerning particles with higher spin.

Pauli gives more adresses of people asking for offprints of Pauli's paper on meson theory.

Pauli thinks that Lopes' results on the interaction energy-matrix in momentum space are correct. He comments on a paper by Schönberg. He agrees to Jauch's plan to work on the life-time of isobars. He writes about recent results of investigations in Sweden.

Pauli comments on a report by J. Leite Lopes.

Pauli writes about Uhlenbeck's contribution to the Bohr-Festschrift.