Molecular Physics

Abstract

THE fact that a second edition of Dr. Crowther's little volume has been required so soon shows that the praise given to the first edition in NATURE for March 25, 1915, was not undeserved. A complete revision of the material has been carried out, and, in spite of the conditions of a great war not being favourable to theoretical research, some additions have been made. In particular, the results obtained in the laboratory of Sir Ernest Rutherford have increased our knowledge of the structure of the atom, and the author has added a special chapter on this profoundly interesting subject, while the chapter on the chemistry of the atom has been almost completely rewritten from the point of view of Sir J. J. Thomson's theory of valency and chemical affinity. The complaint as to the absence of an index in the earlier edition has been at least partly met by a subject index occupying a couple of pages. In its revised form it is certain that the book will be well received, and will be read not only by physi-cists, but also by those engaged in' other scientific pursuits who desire trustworthy information as to the “new physics.”

Molecular Physics.

Dr.

James Arnold

Crowther

By. Second edition. (Text-books of Chemical Research and Engineering.) Pp. viii + 190. (London: J. and A. Churchill, 1919.) Price 6s. net.