Pauli writes about Heisenberg's paper in: Z. Naturforsch.

Pauli gives details of his discussion with Dyson about his definition of renormalization through power-series.

Pauli writes about equations by Yang and Mills using a two-component isotopic-spin-space.

Pauli writes about Jordan's request to send Thellung a lecture by Pauli on problems of the theory of relativity. He writes about Feynman's paper and about Watson's paper.

Pauli thanks for Thellung's manuscript. He requests to fill out more questionnaries about his work and curriculum.

Pauli writes about the positive reaction of Dyson and Huang to Thellung's paper. He requests several technical things and expresses his satisfaction about Thellung's work in Zürich.

Pauli congratulates Thellung on his marriage. He writes about the progress made by Wentzel in the Meissner effect with the help of Bogoljubow's method. He writes about his decision not to publish with Heisenberg. He writes about his own on elementary particles and on indefinite metric.