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Fierz makes some remarks on Aristotle's realism and its contrast to Plato's idealism.

Fierz summarizes tasks and problems of joining atomistic mechanics and thermodynamics. He discusses proof of ergodic hypothesis and statistical behaviour of quantum probability for a macroscopic system.

Fierz writes on the ethical value of music and he sends some quotations from Pauli-Wissowa on the Greek attitude to this problem.

Pauli writes about his intention to write an essay on space, time and God in Newton's writings.

Fierz sends this letter as an addition to his letter of the 28th February 1947 about Chandra's derivation.

Fierz makes some critical remarks on a paper sent to him by Pauli written by Heisenberg, in particular on a discussion of the S-matrix.

Fierz replies to a question put by Pauli in his letter, about causality and quantum electrodynamics.

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 writes on the elaboration of the concepts of polar opposites and complementary opposites. He refers to Kant and Leibniz.

Fierz gives some calculations on the problem of form factors.