Pauli writes about his invitation to Ann Arbor. He is occupied with the divergence problem in the positron theory. He speaks of the damage war physics is causing to experimental physics. Weisskopf is invited to Princeton. (With some additional remarks for Mrs Weisskopf.)

Heisenberg asks if Pauli wants Peierls as his assistant. Heisenberg says that he wants Bloch to come to Leipzig.