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.

Fierz writes on the problem of leptonic charge.

Güttinger encloses a reprint of work on classical electrodynamics.