Includes postcard from Heisenberg to Pauli (Feb. 1940); see also MS. Eng. misc. b. 208/C.138).

General note: Peierls was Pauli's student in the summer of 1929, and assistant from October 1929 to summer of 1932. Early letters are mostly about physics during Pauli's absences from Zürich. Later exchanges of letters about physics (and occasionally about visits) continued.