Pauli writes more about Feynman's paper. He talks about his difficulties to dealing with many excitons.

Pauli writes about Delbrück's reaction to Bohr's letter on biology and physics. He is against the orthodox belief that classical genetics and chance selection alone can explain biological evolution. Pauli writes about an illustration by J Neumann describing the attitude of orthodox biologists. He writes about Oppenheimer's View.

Pauli writes about an error in a manuscript by Heisenberg. He comments on discussions with Pais.

Pauli writes about the magnetic moment with strong coupling in the meson theory. He comments on the two-nucleon problem.

Pauli agrees with Weyl's incorporation of gravitation in Dirac's theory of the electron, and with his rejection of Fern-parallelisme. He writes about as yet unsolved difficulties of Dirac's theory and two-component theory. He writes about field quantization.

Pauli thanks Wightman for his letter of the 6th January 1955 which settles all important mathematical questions.

Pauli writes about Glauber's quotation.

Letter from R. Fleischeuer (antique dealer, "De Gulden Snede") to W. Pauli.