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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.