BOOK REVIEWS. 559 ance to those in different fields of work in the subject. It should be of interest to students and workers who read the German language. R. H. OPPERMANN. DER SMEKAL-RAMAN-ErSEKT, erganzungsband I93I-I937, yon Dr. K. W. F. Kohlrausch. 288 pages, illustrations, 14 X 22 cms. Berlin, Julius Springer, 1938. Price 24 R.M.
More than six years have elapsed since the original book, "Der Smekal-Raman-Effekt," of this series was published. Since then considerable data have appeared which have been quite voluminous and have covered quite a large,field. The present book is offered as a supplement to the former in that it brings the subject matter up-to-date by clarifying and assisting in the way of reference so that definite conclusions can be drawn. It begins with an introduction to the classical theory of light scattering from vibrating molecules and then gives attention to experimental technique. This is followed by a brief treatment on the frequency of rotation in the Raman spectrum and the spectrum of vibrating molecules. Molecular construction with relation to spectroscopic phenomena is given considerable discussion. There is the result of much labor in the reference lists including an alphabetical substance index, conveniently arranged for ready use, and a bibliography of literature substantiating results, arranged by years from 1931 to 1937 inclusive. R. H. OPPERMANN.