Pauli makes critical remarks concerning Fierz's letter of the 6 February 1957(?), concerning the theory of particles, with reference to Majorana's theory.

Pauli makes further comments on Salam's paper in the light of Fierz's comments on it. He writes on Delbrück's paper about the relation between physics and biology and makes some personal remarks on his "mirror-complex" and about Salam.

Pauli writes on calculations and remarks about interactions in which P and T are coupled. Pauli's new mathematical approach proves violation of P-invariance and T-invariance for certain cases.

Pauli clarifies additions to the last letter. On the CTP-theorem and the idea of regarding antiparticles as mirror images of particles.

Pauli writes on the significance of the case of the double root in quantized field theory.

Pauli makes detailed remarks on the problem of weak interaction. He has some questions as regards the mathematical side.

Pauli makes some remarks on the non-homogeneous Lorentz group and also on the unsatisfactory approach to the space-time continuum in physics.

Pauli makes further remarks on entropy and measurment. He also replies to a mathematical question asked by Fierz.

Pauli refers to a letter he received from Rabi on the 19th December 1947 (copy attached) about Schwinger's calculations and their experimental verification. He adds some general remarks on divergencies in quantum electrodynamics. He also comments on the space-time conception of Newton and Kepler.

Pauli comments on Fierz's difficulties in treating the problem of the spin-electron in a magnetic field. He makes some remarks concerning Kepler's astrological ideas.