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NEW BOOKS
attained approach molecular dimensions and little imagination is needed to visualize advances in microscopy that appear to be of the greatest importance to many fields of science. Besides the optical uee of electron beams, their importance aa image transformers in television and aa current multipliers is also discussed. The present tract affords a ready means of becoming acquainted with these modern developments. GEO. GLOCKLER.
A Course of Study in Chemical Principles. By ARTHURA. NOYESAND MILES S. SHERRILL.Second edition. 82 x 5f in.; 6 tables; xxv 554 pp. New York: The Macmillan Company, 1938. Price: $5.00. This famous text has been rewritten and rearranged,-a revision that had been contemplated before the death of the late Professor A. A. Noyes. The first five chapters were published in pamphlet form several years ago. The new arrangement is aa follows: Chapter I. Chemical substances in general; Chapter 11. The first and second law of thermodynamics; Chapter 111. Gases and kinetic theory; Chapter IV. Solutions and molecular theory; Chapter V. Solutions and ionic theory; Chapter VI. Reaction rates; Chapter VII. Chemical equilibrium; Chapter VIII. Phase rule; Chapter IX. Free energy values. The laat chapter includes a short discussion of the third law of thermodynamics and calculations of free energy values from spectrographic and heat data. These modern developments might have been rendered in a more extensive manner. The method used in the first edition, of teaching the fundamental laws and propositions of physical chemistry by means of problems is retained in the second edition. This procedure puts the burden of presentation upon the reader and student. Any individual who will work through the many excellent problems will be amply repaid for his efforts, for he will have covered the subject of physical chemistry in a thorough and complete manner. I t is evident that no person in any way even remotely interested in the subject of physical chemistry can afford to omit this volume from his “must purchase” list of books for his library. The notation used agrees in many respects with the one employed by Lewis and Randall. The book is an excellent text for students in physical chemistry and advanced courses and is to be highly recommended for the clear and precise presentation of an intricate subject. GEO. GLOCKLER.
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Proceedings of the Indian Academy of Science. Jubilee Volume of original papers prepnted in commemoration of the fiftieth birthday of Sir C. V. Raman. The volume contains thirty-eight papers by various authors and has been collected in commemoration of the fiftieth birthday of Sir C. V. Raman. Most of these papers pertain to the subject of the Raman effect, the theory of small vibrations, force constants, diffraction of light by supersonic waves, etc. Some are concerned with quite different topics having no connection with the general theme. The papers are written in English, French, German, and Italian. The volume should be of interest to research workers in the field of the Raman effect. GEO. GLOCKLER. Principles of Flotation. By IAN W. WARK. 101 figures; 39 tables; 346 pp. Melbourne: Australian Institute of Mining and Metallurgy, 1938. Price: 21s. From Australia, cradle of froth flotation, site of the first agglomerate tabling, and early user of skin flotation (DeBavey), comes now the best book yet written on froth flotation. The author WBS the first to publish anything on the modern cationic collectors which have made possible reliable flotation of silicate minerals. The
