[RADIOACTIVITY]. -- FERMI, Enrico (1901-1954). "Possible productions of elements of atomic number higher than 92". In: Nature 133 (1934), pp. 898-899. 4o. Original printed wrappers. FIRST EDITION, JOURNAL ISSUE. Fermi and his assistants conducted experiments attempting to induce radioactivity in elements by bombarding them with neutrons, including uranium and thorium. In these they saw several forms of activity after bombardment, which they attributed to the creation of transuranic elements with atomic weights higher than 92. In fact, what they had witnessed was nuclear fission, as discovered by Hahn and Strassman in 1938. Norman 784. -- FRISCH, Otto (1904-1979) and Lise MEITNER (1878-1968). "Disintegration of uranium by neutrons: A new type of nuclear reaction". In: Nature 143 (1939), pp. 239-240. 4o. Original printed wrappers. FIRST EDITION, journal issue. Frisch and his aunt Lise Meitner found that in experiments, the bombarding of the nucleus of a uranium atom with a neutron caused it to divide into two parts and "to release energy amounting to about 200,000,000 volts. This process bore such a close similarity to the division of a living cell that Frisch suggested the term 'fission' to describe it" (PMM). PMM 422b; Norman 1487. -- FRISCH. "Physical evidence for the division of heavy nuclei under neutron bombardment". In: Nature, 143 (1939), p.276. 4o. Original printed wrappers. FIRST EDITION, journal issue. PMM 422c; Norman 845. -- MEITNER. "New products of the fission of the thorium nucleus". In: Nature 143 (1939), p. 637. 4o. Original printed wrappers. FIRST EDITION, journal issue. The assertion that the fission products of thorium are essentially the same as those of uranium. Norman 1488. (4)