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 comments on the meson theory with integer spin and strong coupling. He writes about Schwinger's approach to the problem. He writes about nuclear forces and about the competition between the nucleon's interaction energy and the energy of isobars. He writes about pair theory. He comments on a correspondence with Dirac about the elimination of divergences in quantum electrodynamics.

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

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

Pauli acknowledges receipt of Uhlenbeck's paper. He writes about the contribution of Dutch colleagues to the Bohr-Festschrift.

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