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Dyson sends more details about the renormalization method.

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

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

Einstein sends his contribution on the subject of complementarity for the periodical Dialectica. Einstein writes about the new progress he made in the extension of the gravitation equation. Alas he was not yet able to obtain a strong and free of any singularities field equation for interesting physical cases. Einstein looks forward to seeing Pauli and his wife in an expected visit. He ends his letter on some remarks on American politics.