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".

Fierz writes about the results of his calculations on the unitary Lorentz-transformations.

Fierz gives the solution of an equation connected with the problem of an orthogonal group.

Fierz makes some general comments on the parity problem.