Pauli writes of Thirring's reaction to van Hove's letter.

Heisenberg asks about the formulation of the difference between $\Psi$* and $\Psi$+ in the Dirac theory, with reference to the operator $\eta$.

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.

Pauli talks about publications in Russia on quantum electrodynamics.

Pauli makes critical remarks about Fierz's attempt to develop a relativistic cosmology of a world free of matter and containing only light.