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This book is a continuation of Volume I under the same title and contains pages 737-13G7. Dr. Weissberger has definitely recognized those physical methods which are of most valuc t o organic research men and has been fortunate in soliciting the help of outstanding authorities in the writing of the individual chapters. I t is apparent that each chapter has been written for the benefit of those who are really interested in applying the material to their own research problems. Sufficient theory is included and especial care has been taken to point out the common pitfalls which the novice might well overlook. Copious pertinent references and illustrative drawings characterize this volume, and the publisher has done an excellent job in the actual construction of the book. Volume I1 includes Chapters XVII-XXVI as follows: XVII. Spectroscopy and Spectrophotometry (by W. West) ;XVIII. Colorimetry, Photometric Analysis, and Fluorimetry (by W. West); XIX. Polarimetry (by W. Heller); XX. Determination of Dipole Moments (by C. P. Smyth) ; XXI. Conductometry (by Theodore Shedlovsky); X X I I . Potentiometry (by L. Michaelis); XXIII. Polarography (by Otto H. Muller); XXIV. Determination of Magnetic Susceptibility (by L. Michaelis) ;XXV. Determination of Radioactivity (by W. F. Bale and J. F. Bonner, Jr.); XXVI. Mass Spectrometry (by David W. Stewart). A fiftytwo-page subject index for Volumes 1 and I1 is included. The writer regards these two books as valuable additions t o his personal library and recommends them without hesitation to those engaged in organic research. RICHARDT. ARNOLD. Chemical Aspects of Light. 2nd edition, revised. By E. J . BOWEN. 300 pp. Oxford: The Clarendon Press, 1916. Price: $5.00. The author states that his treatment of the subject is deliberately extensive rather than intensive and is intended t o supplement rather than replace existing textbooks and articles. In this way i t becomes a most valuable addition to the literature in the fields of spectrochemistry, photochemistry, and the chemistry of luminescence. After an appropriate theoretics1 background, various topics are discussed with illustrat#ions. No attempt is made t o give an exhaustive treatment of experimental results in any of the fields. Specific literature references are not given, but supporting references are given for each of the eleven chapters. Special attention is given to absorption and emission spectra, fluorescence and the luminescenke of solids, photochemical-type reactions, photosynthesis, the photographic proc ess, the reaction of the eye t o light, photocells, and chemiluminescence. Divested of the necessity of dealing with a large amount of espcrimental material and of an excessively mathematical treatment the author has presented the various subjects in a comprehensible form that will attract and instruct both students and research workers. S. C. LIND. Cheniical Crystallography. By C. W. BUNN. 422 pp. London: Oxford University Press, 1945. Price: $7.50. This excellent book is nieant to serve as an introduction to the optical and s m y methods used for the identification of solid substances and for the determination of atomic configura; tions. The author is particularly well qualified to discuss t.hese applications because of years of experience with them in a large industrial chemical laboratory. The treatment has been directed t o the chemist and his application of the techniques, and the rigorous and detailed development of physical theory is largely excluded. The author hss an especially clear style in explaining the elementary principles involved, and has illustrated them with many escellent drawings and half-tone reproductions. Xumerous references have been included for following up any subject in greater detail. -4fter an Introductory Survey the book is divided into t!vo Sections: 1. Identification, and 2. Structure Determination. The following chapters are listed under the heading “Identificnflon”: 11. The Shapes of Crystals; 111. The Optical Properties of Crystals; IV. Identification of Transparent Crystals under the h4icroscope;V. Identification by X-ray
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Powder Photographs. The chapters under “Structure Determination” are :VI. Determination of Unit Cell Dimensions; VII. Determination of the Positions of the Atoms in the Unit Cell by the Methods of Trial and Error; VIII. Evidence on Crystal Structure from Physical Properties; IX. Some Examples of Crystal Structure Determination by Trial; X. Electron Density Maps and Vector Maps; and XI. Broadened X-ray Reflections and their Interpretation. The reviewer feels that the chapters on crystal shape, crystal structure determination by t,rial and error methods, and electron density maps and vector maps will, because of their lucidity, prove particularly valuable to beginners and possibly t o other workers in the field. The book seems to be remarkably free from errors. The use, on page 185, of the term “molecular weight” as synonymous with the absolute weight of a single molecule is confusing and unnecessary. Some minor errors are as follows: I n Fig. 129, page 214, the lower curve, labeled 200, should be labeled 002; line 7, page 232, should read ‘L bc diagonal”; Table V, line 7, page 240, should read “hkl when 1 odd”; and line 4, page 353, s h o u d read “Fig. 218 (right).” Theprinting and binding have been well done. Thus, from all angles, the book is one which the reviewer can heartily recommend. HAROLDP. KLUG.
Advances in Colloid Science. 1‘01. I I . Scientific Progress i n the Field of Rubber and Synthetic Elastomers. By H. MARKA N D G. S. WHITBY(Editors). 453 pp. New York: Interscience Publishers, Inc., 1946. Price : $7.00. This book is a collection of review articles by different authors on scientific progress in the field of rubber and synthetic elastomers. Following the introduction by G. S. Whitby, there are chapters on “Second Order Transition Effects in High Polymers” by R. F. Boyer and R. S. Spencer; “Crystallization Phenomena” by L. A. Wood; “The Study of Rubberlike Substances by X-ray Diffraction Methods” by C. W. Bunn; “The Thermodynamic Study of Rubber Solutions and Gels” by G. Gee; “Significance of Viscosity Measurements” by R. H. Ewart; “Kinetic Theory of Rubber Elasticity” by E . Guth, H. M. James, and H. Mark; “Vulcanization” by H. Farmer; “Rubber Photogels and Photovulcanizates” by H. P. Stevens; and “Reinforcing and Other Properties of Compounding Ingredients” by D . Parkinson. The wide range of subjects covered makes i t certain that this volume will contain sornething of interest and importance to everyone working in the field of high polymers. Two chapters especially, that of Gee on thermodynamic properties and that of Ewart on the significance of viscosity measurements, serve as excellent critical r6sum6s of fields in which much work has been done and still remains to be done. The chapter by Farmer is a very good summary and evaluation of what is known from the chemical point of view about the process of vulcanization. I n short, the articles in the book are uniformly excellent. Each is accompanied by a quite complete bibliography. The book can be recommended unreservedly to all those interested in the field of high polymers. E . J. MEEHAN. Physical Conslants of Hydrocarbons. Vol. I I I . Mononuclear Aromatic Hydrocarbons. By GUSTAVEGLOFF. A.C.S. Monograph No. 78. xiv 661 pp. K’ew York: Reinhold Publishing Corporation, 1916. Price : $15.00. This volume extends to the mononuclear aromatics the very useful collection of data on physical properties already published by Dr. Egloff and his coworkers for simpler hydrocarbons. The physical properties included are melting point, boiling point, density, refractive index, and, where available, values for the critical constants, optical rotation, sublimation temperatures, and temperature and pressure coefficients for the appropriate constants. There is little for us to do in reviewing this book other than to point out the obvious facts that the hydrocarbons covered here are extremely important ones and that the book will
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