Pauli writes about his renouncing the partnership with Heisenberg. He thinks there are mistakes in Heisenberg's integration of his equation. Further, if one attempts to loosen either the causality or the unitarity of the metric, this leads to disastrous results in relativistic theories. His impression is that one has to wait for new physical ideas, because mathematical virtuosity alone cannot lead to the discovery of new laws of nature.

Pauli takes an interest in Jauch's scientific development and hopes to find a position for him. He writes of his own work with Fierz. He hopes to succeed in getting rid of the spinor-calculus.

Pauli urges Jauch to take his final examination so that he could come to Zürich if Fierz goes to Basel.

Pauli discusses technicalities of Jauch's possible trip to Switzerland next spring. He writes of his own work on a theory of particles with arbitrary spin. He suggests that Jauch should study meson theory.

Pauli hopes that in spite of all the difficulties caused by the war, Jauch will accept the position as assistant in Zürich.

Pauli thinks that he should remain in the U.S.A. until the end of the war. He asks Jauch to send him his lecture notes. He discusses the problems of electron scattering. He writes of theories about the meson in the U.S.A. and about experiments with proton-proton scattering.

Pauli discusses the treatment of interaction between heavy particles and electrons. He comments on Marshak and Weisskopf'calculations. The main problem is now the creation of mesons in explosions.

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 replies to Jauch's ideas about the treatment of the deuteron problem. He agrees with Jauch's research plan to investigate the deviation from Coulomb's law due to the interaction of nucleons with charged mesons.

Pauli comments on Jauch's calculations and gives advice as to the preferable alternatives. He thinks that Jauch's method is important and urges him not to give it up in spite of Jauch's doubts.