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Fierz talks about the derivation of the Casimir-pressure exerted on two neighbouring metal plates by the zero-point radiation field.

Fierz discusses the unitary representations of the Lorentz group for general functions expanded in vector functions of Harish-Chandra. He applies to Majorana'a equations published in: Nuovo Cimento: 1932.

Fierz makes some additions to his letter of the 15th May 1951.

Fierz speculates about the roots of Jung's synchronicity. He agrees with Pauli about the connection with Leibniz's principle of sufficient reason, which cannot be reduced to logic, and his principle of contradiction which is a logical one. Both principles complement and exclude each other. There are possible relations between human consciousness and the idea of law.

Fierz replies to Pauli's letter about the Bloch-Møller theory. He comments about Peierl's and Bloch's arguments regarding the physical significance of form factors.

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

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 investigates whether the non-statistical H-curve has the properties demanded by Boltzmann.

Fierz sends a note written by Schiff. He solves a differential field equation.

Fierz writes on Goethe and the blue colour. He makes further remarks on Henry More and Newton and on their rejection of Descartes' mechanistic world picture.