W. Pauli's classification as resident in United States.

W. Pauli's classification as resident in United States.

Pauli writes on the unitary representations of the Lorentz group and on the meson theory.

Pauli makes further remarks on Dirac's theory. He withdraws the objection concerning singular processes. He considers ways to derive Einstein's radiation laws. He makes some calculations on low-frequency photons. He comments on higher order corrections of the Klein-Nishina formula. He nnounces the publication of a paper about Dirac's theory.

Pauli sends a letter of congratulation on Born's 60th birthday. He makes some remarks on quantized field theory and on meson theory in particular. He adds some personal remarks on colleagues in Switzerland, Germany and the U.S.A.

Representation of group U.

Pauli gives further calculations in connection with Majorana's theory. He also writes on his calculations with Weisskopf on the positron theory.

Pauli expresses his interest in some results of Dirac's pupil Eliezer and he makes some critical comments on his paper.

Pauli compares some of Yang's equations with his own results.

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