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duced earlier i n the chapter. The discussion of complex reactions, in the chapter on ionic reactions, is somewhat disappointing. The discussion of enzyme reactions, in the chapter on heterogeneous reactions, while brief, is both interesting and stimulating. The bibliographies given are extensive enough t o be useful, but in many cases are far from complete. To the reviewer there appears to be some bias in favor of articles which have appeared in English journals. No student of physical chemistry who is interested in any phase of the kinetics of chemical reactions in liquid systems can afford t o ignore this book. It should also prove very useful to organic chemists, biochemists, and others who utilize reaction velocity measurements in the study of their omn problems. ROBERTS. LIVIKCSTON. The Kinetics of Chemical Change in Gaseous Systems. By C. N. HINSHELWOOD. Third edition. 390 pp. Oxford Press, 1933. Price: $5.00. Since the appearance of the first edition of this book in 1926 (second in 1929) notable advances have been made in the field of chemical kinetics of gases, t o which the author has been a n outstanding contributor. The present treatise is not only modern and authoritative but presented with unusual clarity. One new chapter has been added, “Homogeneous Catalysis of Gaseous Reactions,” which affords a very natural transition to some considerations of reactions in solution. Much new material has been added throughout which brings the work abreast of the present status of gas kinetics. The work will continue t o be indispensable t o all those interested in this field. S. C. LIND. Elementare Einfuhrung in d i e Quantenmechanzk. By K. K. DARROW.Translated from the English h y E. Rabinowitsch. 22 x 15 cm.: 123 pp. Leipzig: S. Hirzel, 1933. Price: 6 RM. Dr. Darrow, of the Bell Telephone Company’s laboratories, is already well-known as a writer of unusual clarity and grace of style on many subjects of modern physics. In particular his “Electrical Phenomena in Gases” stands out as one of the very few comprehensive treatises on this subject. The present book follows naturally on the author’s “Elementare Einfuhrung in die Wellenmechanik” and forms the third volume in a series of books on new problems of physics and chemistry. The book is divided into two main parts, the first of which discusses the wave and corpuscular nature of matter and radiation, the wave equation, and the uncertainty principle of Heisenberg. These sections particularly are t o be commended for their lucidity. Part I1 deals with the main subject matter of the book, quantum mechanics and the emission and absorption of light by atoms. The elementary principles of matrix algebra are considered and the author goes on t o discuss the calculation of eigenvalues by the matrix method and t o demonstrate the connection between the wave mechanical and matrix treatment of atomic problems. As the title indicates, the whole is set out avith the minimum of mathematical elaboration consistent with the thesis. The book should form an admirable introduction t o one of the fundamental aspecte of modern physics. Although originally written in English it has not, so far, been published in t h a t language. All students of physics and chemistry who can read simple straightforward German are certain to derive benefit from thislittle book. J. T. RANDALL. Ueber heterogene Gleichgewichte che,mischer Stoffe i n Wissenschajt, Natur und T e c h i k By ERNST JANECKE. 25 x 16 cm. ; 31 pp. Stuttgart : Ferdinand Enke, 1934. Price : 2.70 RM.
