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Pauli asks Fierz about Leibniz's principle of the identity of indiscernibles, which is mentioned by Weyl in connection with the exclusion principle.

Pauli writes on his own relation to physics and psychology as against Jung's, on the connection between synchronicity, statistical causality and deterministic causality and about the scientific thought as a special case of a coincidence of psychological expectation and external physical events.

Pauli writes to Fierz on a paper written by Yukawa, on a suggestion made by Fierz in this connection, on the present difficulties of quantized field theories and on his discussion with Panofsky in Princeton about Kepler and Fludd.

Pauli makes some remarks on a paper written by Heisenberg.

Pauli replies to a letter written by Fierz. He makes further remarks on Neoplatonists, on the Renaissance metaphysicists and on automorphism.

Pauli comments on two treatises by Huygens, the "Traité de la lumière" and the "Discours de la cause de la pesanteur". He also writes on Descartes' theory of vortices.

Pauli gives further comments on Bohm's ideas, in particular on the hidden parameters.

Pauli gives a critical comment on a letter by de Broglie and his attempt to combine a deterministic picture with the wave-mechanical probability,

Pauli replies to Fierz's letters on thermodynamics. He refers to papers by V Neumann, Szillard and Einstein. He also writes on different formulations of entropy which have the same meaning.

Pauli gives further analysis of the entropy concept. The entropy of an ensemble is identical with the entropy of a single system. This under the condition that it concerns the measure of the information corresponding to the same ensemble.