Zwahlen sends a manuscript on the eighenvalue problems.

Zwahlen writes about success of solving a differential equation.

Weyl welcomes Pauli as a collaborator. He compares notes from the 3rd edition of his own book with Pauli's resultes. He writes about the asymmetry of positive and negative electricity.

Weyl thanks Pauli for his proofs and for his paper published in Phys. Z. He writes about the statistic spherical-symmetrical solution of Einstein's field equations. He writes about the difference between the two electric charges, and its dependence on the more fundamental difference between past and future. He comments on the fields in the interior of the electron.

Van Hove has some observations about charge renormalization.

Van Hove talks about Landau's paper on renormalization.

Theis writes about his calculations as regards the form factor theory.