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 writes about the problem of space in connection with field theory and geometry. He makes some remarks on Pauli's two opposites: (+ -) and (p,q), and the speculations about similar opposites in psychology (individual and society). He also writes about Newton's concept of space and on Henry More's influence on him.

Fierz writes on the elaboration of the concepts of polar opposites and complementary opposites. He refers to Kant and Leibniz.

Fierz makes some remarks on Aristotle's realism and its contrast to Plato's idealism.

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

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

Fierz agrees to participate on the symposium on "Phenomenon and physical reality". He describes his interpretation of the concepts of "phenomenon" and "reality", and relates this to the present situation of physics.

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