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Fierz questions Szilard's assertion on reversibility of mixture of systems. He considers how measurement might be seen as turning pure state into a mixture.

Fierz thanks Pauli for the offprint of a paper on gravitational waves. It seems to follow from it that the statement about non-existence of gravitational radiation is unjustified.

Fierz sends some calculations with reference to Chandra's work on the infinitesimal Lorentz group.

Fierz summarizes Harish-Chandra's work on simplified integration of symmetric-tcp wave functions by Lorentz transformation.

Fierz writes on the symbolic significance of birds and on two physical description.

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 makes some remarks about top-functions.

Fierz writes about a letter written by Heisenberg dealing with Fierz' quantum electrodynamics arguments.

Fierz criticizes earlier work by Pauli and Fierz on the H-theorem, published in: Zeitschrift für Physik: 106 (1973), 572. He suggests some improvements in entropy as measured by macroscopic observer.

Fierz elaborates on physical grounds, for proposed changes in their work, on the H-theorem. He focuses on entropy.