Pauli writes again on the representation of the inhomogeneous Lorentz group. The letter goes on to discuss the interrelations between the concepts of space and world soul, and space in Jewish sources, and in Plato' Timaios. He writes that objective psyche and absolute space are like a pair of opposites.

Weizsäcker gives his reasons for his decision not to participate in the Zürich symposium. He says that he would like to continue his talks with Pauli.

Fierz discusses the question of which representations of the homogeneous group can be contained in the inhomogeneous Lorentz group.

Born accepts an invitation to a symposium. He hopes to enter his new house in Pyrmont in ten days. He writes on his ideas about an indeterministic, statistical formulation of classical mechanics and the transition from the individual state to a statistical equilibrium. He writes of his impending honorary doctorate in Oxford.

Gagnebin replies to Pauli's question on Lamarck. He gives a detailed description of Lamarck's ideas which are essentially rationalistic.

Weizsäcker sends an article on concepts in Goethe's science to Pauli. He believes that Goethe achieved a synthesis of Platonism and a real understanding of matter.

Pauli refers to several authors and works concerning biology and physics, including Bohr and his concept of "wholeness", Gagnebin and his understanding of Lamarck as a rationalist, and Goldschmidt's "Different Philosophies of Genetics".

Fierz' letter concerns the interpretation of a passage in the Timaios. He quotes the passage in Ficino's Latin translation.