Career in nuclear physics, chiefly through 1939; describes differences in atmosphere among the Universities of Vienna, Berlin, London and Copenhagen; his switch from mathematics to physics at Vienna; work at University of Berlin on a grant, with Peter Pringsheim, before going to Hamburg to work with Otto Stern; with Hitler laws in effect, leaves for position with Patrick M. S. Blackett at Birkbeck College, 1933; then to Niels Bohr's Institute, until 1939; anecdotes about working on neutron experiments and nuclear models in Copenhagen; recounts how he and Lise Meitner explained fission, and memorandum with Rudolf Peierls on bomb possibilities; brief comments on postwar career.
