Pauli thanks Gagnebin for his letter on Lamarck. He expresses doubts on the significance of the concept of selection for the explanation of biological evolution. There exists no theoretical model for the assessment of the time scale evolution.

Pauli writes about von Steck's results in Heidelberg.

Pauli replies to Fokker's question and thinks it worthwhile to prepare an edition of Ehrenfest's collected work.

Pauli asks some questions concerning the relation of a paper by Majorana (published in: Nuovo Cimento: 1932) to Pauli and Fierz's theory about particles of arbitrary spin.

Pauli comments a letter from Fierz regarding the unitary representations of the Lorentz group.

Pauli makes some critical remarks on a letter by Fierz about the entropy change during a measurement. He adds a short reference to Bohr's view on this problem.

Pauli refers to some points for a future discussion with Fierz: 1) on the problem of divergencies in quantum electrodynamics 2) on the relation between concepts and sense perception. He also writes on the laws of nature as physical manifestation of archetypes and he refers to Kepler and his polemic with Fludd.

Pauli sends Fierz some critical remarks on an article written by Schrödinger who is not ready to accept the epistemological consequences of quantum mechanics. He also comments on Fierz's statement by an "arbitrary decision of the observer".