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

Green asks about the interaction term in Pauli's non-local theory published in Nuovo Cimento 1953. He offers an alternative and proves it satisfying Pauli's conditions.

Fierz writes on Newton's philosophical background, between Descartes' rationalism and Hume's scepticism.

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 writes on gravitational waves, on the symbolic significance of the blue colour and on Henry More's third "Divine Dialogue".

Pauli formulates propositions on positivism, determinism, neo-Darwinism, etc.

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

Magdalene Aebi sends reprints of her philosophical works. She discusses her attempt to unify all sciences. She critizises Gonzeth and praises Bernays.