75/2106 Aston, F.W. Isotopes. London, E. Arnold, 1922, VIII,152,8 advert.p., 4 plates, 21 ills., orig. cl.

- Bookplate on upper pastedown. Lower joint splitting. Otherwise fine.

= PMM 412: "Once Aston had shown that the true atomic weight of an element is arrived at by averaging the mass of its constituent parts, and that there are seven isotopes of mercury and nine of xenon, the possibility that the atomic weights of elements would generally be whole numbers was finally abandoned"; DSB I, 230: "Aston's work, therefore provided important insights into the structure of the atom and the evolution of elements. (...) Aston's achievements were kept continually before the scientific public by revised editions of his excellent book Isotopes (...)".