Theis writes about his calculations as regards the form factor theory.

Pauli makes more remarks about relativistic cosmology and references to Jordan's theory.

Lion makes remarks on his dialectical view of "historical causality" in response to Pauli (in: Dialectica : 8 (1954), pp.283). She asks about its applicability to physical causality.

Yoffe thinks that Thirring's cut-off method is wrong.

Göhring thanks for returning the proofs of Pauli's lecture given in Mainz.

Lehmann makes some remarks about the meson theory and the work of Dyson and Dalitz connected with it.

The letter contains a critical discussion of Heisenberg's quantization of non-linear wave equations.