490
NEW BOOKS
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
