Pauli talks about Schwinger's contribution to the Handbuch.

Pauli talks about the preliminary report which he and Heisenberg have circulated about their joint work. Pauli does not believe anymore in many of the statements in this report. He has written to Heisenberg that the assumption of vacuum degeneration does not seem any more necessary to him. He writes about his talk with Gürsey in Brookhaven. Pauli speaks of his optimism about the solution of the general formal questions which have nothing to do with group theory. He believes that the symmetry violations do not depend on arbitrary terms in the Hamiltonian but on the metric in Hilbert-space.

Pauli talks about the formulation of the present state of their considerations: a spinor model (Lagrange function and vacuum expectation values) cannot have any invariance property from which the vanishing of rest masses can be concluded. From the assumption of exact C-invariance and $\gamma{s}$-invariance this vanishing follows. Therefore they have added terms violating $\gamma{s}$-invariance.

Pauli talks about the still existing difficulties with the Handbuch-article and Springer. He writes of his lecture on many-particles-systems. He does not want to touch field quantization for a while.

Pauli writes about the degrees of simplicity of field quantization theories of Heisenberg, Schwinger and Feynman-Dyson. He is interested, at present, in which interactions become convergent after renormalization and which do not. He speaks of results obtained by Matthews (Cambridge) for certain meson theories.

Pauli doubts some of Källén's formulae for the Lee model. He writes about calculations of convergence of integrals and about the proof for the consistency of Peierl's method.

Pauli talks about his final views on the formulation avoiding infinities. He is against the tendency of Källén to use cut-off methods. He has a suggestion for a joint publication "on the mathematical structure of Lee's example in renormalizable field theory". He writes a synopsis of the suggested paper.

Pauli writes of Landau's paper "The quantum theory of fields" for the Bohr-Festschrift and comments on it. He says more about the Thirring-model and about Heisenberg's paper on the non-linear spinor-equation.

Pauli writes about Thirring's reply to Pauli's criticism. He talks about an error in Pauli's last letter concerning quantum electrodynamics. He writes about a discussion with Thirring at the Bern-conference about indefinite metric.