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Fierz replies to a letter by Pauli and makes some remarks on the $\beta$-decay. Fierz sent another letter on the same day including some corrections to this one (see letter fierz_0016-282r).

Fierz makes further remarks concerning a paper by Stückelberg.

Pauli discusses the philosophical duality realism-nominalism. He mentions that he is one of those who think that ideas have a reality at least as strong as that of sensations.

Pauli explains his use of the adjectives "positivistic", "realistic", "idealistic" and "phenomenalistic" as logically linked aspects of the world and as corresponding features of a theory.

Referring to Bohr's lecture "On the unity of knowledge", Pauli mentions his misunderstandings with Bohr concerning the concept of the "detached observer", the concept of reality in atomic physics, Bohr's conception of "complementarity" as foundation of a world religion, and the use of the concept "antinomic" (antinomisch).

Lanczos thanks Pauli for his reply to his letter of 27 Nov, which clarifies the point in question.

The letter talks about the "sudden death of parity" in Wu's experiments, problems with nucleon-force data for deuterons and travel plans to Copenhagen, Zürich and Sydney.