Pauli talks about a calculation by Thirring on an idea of Pauli and Landau in quantum electrodynamics. He writes on the use of the cut-off-rule.

Källén talks about Thirring's work on quantum electrodynamics.

Weizsäcker comments on Pauli's article on the unconscious. He gives his ideas on structures as possible properties of soul and matter.

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.

Weizsäcker writes about his complementary logic. He makes remarks on Pauli's biological speculations.

About the renormalization and the Thirring cut-off.

Letter accompanying the proofs of Pauli's article (Mainz lecture).