Pauli replies to Lüders' letter of 26 April. He talks about problems of coordinate-mirroring, of particle-antiparticle conjugation and of invariance of the equation with regard to the continuous Lorentz group.

Pauli sends a manuscript of his article for the Bohrfestschrift to Lüders. He asks if some equations related to the interaction of charged bosons with protons and neutron spinors can be found already in earlier literature. He talks about commutability and anticommutability of independent fields with half-integer spin.

Pauli replies to Lüders' letters of 8 Dec and 13 Dec about elementary particle theory.

Pauli expresses interest in Ma's redundant zeros of the S-matrix in the case of a potential $Ae^{\mu r}$.

Pauli talks about the Riesz-Gustafson method. He makes some comments on Ma's letter of 26 June.

Pauli makes further remarks on the redundant zeros of Ma, with a mathematical addendum.

Pauli makes comments on Ma's new manuscript sent to him on 29 Sept.

Pauli replies to Ma's letter of 7 Nov and comment on his success in reaching invariance by a combination of two substraction methods. He talks about the difficulty of logarithmic singularity in the theory of holes.

Pauli reports on discussions with Nielson (Lund) on the Riesz-Gustafson method.

Pauli makes comments on Ma's paper. He is against the waste of too much work on purely classical theory. He makes comments on an earlier letter of Ma, concerning a certain invariant factor.