Weizsäcker comments on Pauli's essay on Kepler. He agrees, with certain qualifications, with Pauli's criticism on naive empiricism. He writes about his interpretation of Kant's "a priori".

Weizsäcker gives his reasons for his decision not to participate in the Zürich symposium. He says that he would like to continue his talks with Pauli.

Weizsäcker sends an article on concepts in Goethe's science to Pauli. He believes that Goethe achieved a synthesis of Platonism and a real understanding of matter.

Symanzik replies to two of Pauli's letters. He writes about symmetry properties of field equations and about certain properties of a "system A" derived in: Nuovo Cimento: 1(1955), pp.205.

Symanzik replies to Pauli's question about dispersion relations for Lee's model.