DR. ASTON'S book on “Isotopes” is very far from being a mere reprint of his published papers; it constitutes a masterly review of all the aspects of the subject with which he deals. As a result, those who are already familiar with the principal papers which have appeared in the Philosophical Magazine will find in the book much that is both interesting and instructive. Thus, the author's account of Dempster's alternative form of the mass-spectograph is particularly, interesting; and Dr. Aston has rendered a real service to readers who are not specialists by bringing together in one volume all the methods and results of work on isotopes. His summary of the investigations which have been carried out on radioactive isotopes is particularly concise and readable.


    By Dr. F. W. Aston. Pp. viii + 152. (London: E. Arnold and Co., 1922.) 9s. net.

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    Isotopes. Nature 109, 736–737 (1922).

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