THE third edition of this excellent text-book will be as welcome as were its predecessors. Compared with the first issue, which appeared in 1921, the biggest change made is the substitution of the original last chapter, which dealt with the radio-elements and atomic structure, by one of about three times its length, which is inserted earlier in the work, immediately after the elementary treatment of the Periodic Law. Commencing with cathode and positive rays, this new chapter (xxv. -The Structure of the Atom) introduces the conception of isotopes, proceeds to discuss in turn X-ray crystal analysis, atomic numbers, and radio-active phenomena; touches on the Rutherford-Bohr conception of the atom and the artificial disintegration of elements; deals with the octet theory of G. N. Lewis, different types of linkage, and quantum numbers; and concludes by a discussion of atomic structure, the periodic table, and valency, reference being made, inter alia, to the work of Grimm and of Fajans, and to wave mechanics.
A Text-Book of Inorganic Chemistry: for University Students.
Prof. J. R. Partington. Third edition. Pp. viii + 1083. (London: Macmillan and Co., Ltd., 1930.) 15s.