Pauli comments on a paper by Weyl published in the April issue of Proc. Nat. Acad. Sci. He writes about Lagrange's function. He writes about quantization of field equations. He asks Weyl about his future plans.

Pauli writes about his impending trip to the USA. He writes about his work with Heisenberg.

Pauli invites Yang to a lecture in Zürich. He comments on an interpretation of a recent experiment by Garvin and Ledermann and by Deutsch and Frauenfelder on parity violation. He critizices two-component theory. He writes of his own views on T-invariance and conservation of Lepton-Charge. Only the development of quantized field theories will provide answers to the deeper questions.

This is a supplement to the letter of the 26th May 1957. Pauli comments on a theoretical paper by Preston (Birmingham) which fits well with Pauli's critical attitude towards the two-component theory. He writes about Preston's proposal to give up the conservation of leptons. Pauli thinks that T-invariance seems still to be possible.

Pauli comments on a paper by Salam and his B-field. He writes about the open question whether the rest mass of the B-particles is zero. He writes about the conservation of lepton charge, two-component theory and CP or T symmetry. He writes about Lüders' and Pauli's theorem, and Schwinger's previous theorem. He makes remarks on his calculations last autumn, connected with the "Pruett-factor".