Abstract
DR. HAAS is a gifted exponent, with a particular talent for compression. In this book of some two hundred pages he deals with the experimental establishment of the existence of the electron, the quantum theory of spectra, the modern work on X-rays and crystal structure, isotopes, and, in short, all that fascinating body of modern work which centres round the structure of the atom. He touches on such details as the selection principle of Sommerfeld and Lande, with its inner quantum number; the metastable state of the helium atom established by Franck; and the quantum theory of band spectra. There are, of course, only a few words devoted to each of such subjects, but these words are always pertinent and well chosen, and reveal the essence of the results obtained. Bohr's work of the last few years on the grouping of electrons in the general atom, and the interpretation of the periodic table in terms of quanta, is handled at comparative length, the periodicities revealed by the X-ray terms and the bearing of the spectra of potassium and calcium on the electron grouping in the first long period being well explained. The book concludes with an eight-page summary of its contents. Atomtheorie in elementarer Darstellung. Von Prof. Dr. Arthur Haas. Pp. viii + 204 + 2 Tafeln. (Berlin und Leipzig: Walter de Gruyter und Co., 1924.) 5.40 gold marks.
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