Thirring replies to Pauli's question in his last letter. He says that the answer is in Michel's paper published in: Nuovo Cimento: 10(1953), pp.334.

Thirring makes calculations on Raman's scattering for certain conditions in Lee's model.

Thirring agrees with Pauli's formula obtained from the Thirring model. He discusses Pauli's remarks on mass renormalization in this model.

Thirring presents his model for a renormalized quantum theory along with difficulties applying it to nuclear problems. He discusses the work of Petermann, Edwards and Keberle. He writes about his travel plans to Italy and Yugoslavia.

Thirring writes about his work on quantum electrodynamics, especially his cut-off method.

Thirring replies to Pauli's letter. He writes about the progress of his work on electrodynamics and about his attempts with the cut-off method. He comments on papers by Russian physicists.

Thirring makes remarks about a statement by Heisenberg on renormalization.

Thirring writes about the necessity for a clearer definition of Heisenberg's formalism in the light of Lee's model.