Pauli thinks that Heisenberg's letter of the 19th November contains terrible nonsense.

Pauli makes a recapitulation of the properties of Pauli's and Heisenberg's model and gives a critical consideration of Fermi's theory of Beta-radioactivity. He makes remarks on recent publications on nuclear forces.

Pauli talks about further discussion of the Bethe-Heitler formula. He comments on the hard component of the primary cosmic radiation.

Pauli writes on the problem of wave-quantization as the fundamental problem of physics. He is inclined to drop the idea of the existence of a universal length, because such an assumption cannot lead to finite energy values in a quantized wave theory. He talks about the interpretation of recent results of shower-measurements.

Pauli replies to Kemmer's letter (14 February) to Fierz. He talks about his forthcoming lectures on field quantization and gives some remarks on Dirac's equations for particles with higher spin.

Pauli asks a question about a possible magnetic spin moment of yukons, and calculations in connection with this.

Pauli gives comments on a new manuscript by Heisenberg which is valued very positively by Pauli.

Pauli writes about a work by Uhlenbeck and Kahn. Pauli uses the V D Waals state equation in order to show that the thermodynamical considerations of Uhlenbeck cannot be correct. He hopes to come again to Holland. He writes about Heisenberg's difficulties with Stark and the Gestapo, and that Heisenberg requests that physicists abroad should support him. He writes about the necessity of jobs for dissmissed Viennese physicists.