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.

Pauli replies to Ma's letter of 3 May. He makes comparison of Riesz's method with the Lambda-limiting process. He recommands to Ma to work on supra-conductivity.

Pauli makes more remarks on Ma's redundant zeros of the S-matrix.

Pauli replies to Ma's letter of 20 July, concerning the validity of a relation by Heisenberg. He reports on the international physics conference in Cambridge, on a discussion there with Powell and Amaldi, and on papers delivered by Wentzel, Møller, Heitler and Pauli.

Pauli talks about Ma's proof of the nonvalidity of Heisenberg's relation. He asks Ma to report to him on papers by Oppenheimer and Bethe at the Amer. Phys. Soc. meeting in New York.

Pauli replies to Lüders' letter of 30 June. He makes remarks about anticommutation of different spinor fields.

Pauli acknowledges Lüders' comments on his Bohrfestschrift article. He writes of his study of Lee's paper (in: Phys. Rev. : 95 (1954), pp.1329) and of some improvements he could make on it.