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Elsasser explains why he thinks that his book touches upon the basic epistemological problem of our age, the formation of concepts.

Elsasser gives further explanations of the principle which forms the central idea of his book and he explains why it differs from the second law.

Enz writes on his theory on renormalization of photon-electron coupling constant.

Enz writes about a student's diploma work and about a discussion he had with R Jost on "associated production" of $\mu$ -mesons.

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.