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Ehrenfest is looking forward to see Pauli in Leiden. he mentions some papers by Heisenberg, Hund and on group theory, on which he wants to ask Pauli several questions.

Ehrenfest sends a short note in which he expresses his doubts as to the separability of the operator-function M representing the spin interaction of the two He-electron.

Ehrenfest discusses in a joking language the results of some of his investigations in the light of Pauli's exclusion principle.

Ehrenfest gives some personnal remarks on Oppenheimer and sends him to pauli. He also makes a comment on rutgers.

Ehrenfest discusses the disappearance of the "zeroth-order spectrum" for X-ray diffraction in liquids (Zernike-Prins, in: Z. Phys. : 41 (1972), pp.190). He asks Pauli to calculate it.

Ehrenfest sends his daughter's notes on Pauli's work in the early twenties for comments. He also asks about a action-at-a-distance in the Schrödinger theory.

Ehrenfest writes that he is unable to speak on X-ray problems in Zürich. He asks about Pauli's views on beta spectrum.

Dyson writes about the renormalization method in quantum electrodynamics, especially on the renormalization of the Heisenberg operators.