Pauli writes about parity-violation. Includes an appendix about two-component theory.

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.

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 makes remarks about a paper by Lüders on the TCP-theorem and about the formulation of the parity condition.

Pauli reports on Jost's results concerning the TCP-theorem.

Pauli replies to Lüders' comments on Pauli's last paper.

Pauli writes about a problem which has still to be solved: the application of the theory of invariants to the decay of My-mesons. He writes of his discussions with Heisenberg on a special case of the Lee-model.

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