Mähly sends a reprint of his dissertation on anisotropic bodies with remarks. He writes about his summarizeds significant results for quantum theory.

Güttinger encloses a reprint of work on classical electrodynamics.

Fierz gives Pauli his calculation on $\Box$ G-H.

Fierz writes about a letter written by Heisenberg dealing with Fierz' quantum electrodynamics arguments.

Fierz gives some calculations about unitary theories. He makes some remarks about Plotinus and Goethe. He also replies to a question about spin and statistics.

Fierz summarizes findings on entropy and observation in 5 "theses".