Les Dislocations dans les Cristaux by W. T. Read

a deeper study of the subject. I t is, however, a disadvantage that too few references are given in the text. Some textbooks and general articles are listed at the end. As these references often treat a multitude of topics (e.g. Bozorth's Ferromagnetism), it will not be very easy to find the special subjects mentioned in the text. Though the X-ray crystallographer will find here the necessary concepts for his investigations on alloys, X-ray diffraction itself is rather scantily represented. In my opinion only X-ray crystallographers will understand the theoretical part (Chapter 2), and the experimental results am given without much explanation of the methods used. As, however, X-ray diffraction is only one of the tools for investigating alloys, this omission may perhaps be excused. J. BOUMAN Technische Hogcschool, Delft Netherlands Although the basic concepts of many parts of the subject are essentially wave mechanical, the book does not call for a detailed knowledge of the formalism of modern quantum theory, and consequently most of it may readily be understood by any well taught university student of the physical sciences. Several topics have been omitted: perhaps the most surprising is the omission of any mention of thermoelectric effects. Other topics such as low-÷,emperature conductivity are only touched upon. The book is beautifully produced with clear diagrams on almost every page and several photographic reproductions of especially interesting phenomena. Sets of problems are to be found at the end of each chapter along with a useful list of general references. H. JONES Department of Mathematics Imperial College London S .W. 7, England