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.