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In this letter Dyson criticizes Heisenberg's use of the "Hilbert space II" as an alternative to renormalization.

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

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.