BOOK REVIEWS tionalieation of optical activity, optical rotary dispersion, and circular dichroism; atropisomerism; and s. contrast of dissymmetrically perturbed symmetric chramophores and inherently dissymmetric chromophares. The hook is divided into three parts of approximately equal length. The first treats, under the heading of Structure and Symmetry, the nature of the relationship between bonding geometries, hyhridiaation, and molecular deformation. This is followed by an introduction to symmetry elements and point groups as they apply to molecular geometry. The author demonstrates here, as in the remainder of the hook, a sensitivity to the student's need for careful and explicit definition of all terms. The drawings snpporting the text are of excellent qualitytwo-color use being both functional and restrained-hut their effectiveness is reduced by being removed from the related text in an unfortunate number of cases. I n this section a page must he turned for initial reference to 12 of the 24 figures discussed. The short examination of molecular
such aids now available. The second section, titled Stereoisamerism, is in my judgment the most rewarding of the three. The author has adopted
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a somewhat different (hut in no sense radical) classification method for stereoisomers which permits a natu~alinclusion of those consequences of conformational isomerism that have been recognized durine the ~ a s 20 t vems. New terminoloev a p p e ~ r ~ " i . r inrnrlwed ly and grnrral urr i. rn;da 111tlw cylnnl?rr). rlemrnta lntrrr duced in the first section. The final section concerns itself with separation and eonfigurationd identifieation of stereoisomers. The classical separation techniques are treated briefly and followed by an excellent presentation of asymmetric synthesis and kinetic resolution. The concluding discussion is cancerned with the determinstion of absolute and relative configuration by chemical and (at more length) physical methods. Each section is followed by ahout 20 questions and problems which "are designed not only to test understanding.. but to advance the student beyond the descriptive material." They are of a nature which should fulfill this goal. Answers to d l exercises are provided. With very occasional exceptions the presentation is a t a quite sophisticated level and makes maximum use of assumed undergraduate background. However, the text is utterly without documentation. This lack is a serious one and the 29 item bibliography appended t o the hook in no way overcomes it. Each teacher--partitularly one whose field is other than stereochemistry-will be faced with an inordinate amount of literature combing in preparing lectures to follow this text. I t is regrettable that this could not have
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been avoided. The lack of reference t o the original literature is unquestionably the weak point of this well-conceived and exeellently-written book. Suoh neglect is difficult to rationalize for any advanced text and particularly so in this Monograph Series, the last volume of which ("Modern Synthetic Reactions" by H. House, J. Chem. Educ., 42, A910, [19651) possessed such magnificent documentation. Except for a few mistakes in the figures and formulas of the first section, the book is essentially free of errors. The index is nell prepared and complete.
Q U E N T R. ~ PETERSEN Wabash College Crawjordsville,Indiana Magnetism.
Volume 2 A
Edited by George T. Rado, U S . Naval Resew& Laboratory, Washington, U.C., and Harry Suhl, University of Cslifornia, La Jolla. Academic Press, Inc., New York, 1965. xv 443 pp. Figs. and tables. 16 X 23.5 cm. $15.
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This volume continues the thorough, up-to-date coverage of magnetically ordered materials which was started in 41, A810, Volumes 1 and 3 (THISJOURNAL, 1964). The items emphasized in the seven chapters of Volume 2A are st,atistieal mechanics, magnetic symmetry, and hyperfine interactions. The first three chapters (165 pages) are theoretical: Statistical Mechanics (Conhued on page Ad76)
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the out,linine of Critics1 Behavior in Maenetic Svstem. - of areas that need further Statistical Mechanics of Ferromagnetism, research. and Magnetic Symmetry. CARLW. MOELLER The next three chapters are probably University of Connectkt of more current interest to chemists; Siarrs these describe the applications of such ~ x ~ e r i m e n t atechniques l as Miissbauer effect, nuclear magnetic resonance, and nuelear quadrupole resonance to the study of magnetic ordering. The t,opirs are: Hyperfine Interrtetions in Magnet,ir Xaterials, Nuclear Resonance in Antiferromagneties, and Nuclear ILesrmance in Ferromagnetic Materials. The final chapter is titled Theory of hlagnetism in the Rare Earth Metals. This includes a discussion of the experimental magnet,ic results and the structures of the metals correlated with the theoretical treatment. The extensive treatment of hyperfi~te interactions is indicated by the 138 pages and 442 references in that chapter. IL is ahown that through the study of hyperfine interrtctians information can be aequired about such important properties of magnetic materials as spin distributions, magnetic moments, valeneies, electron configurations, crystal field paranleters, and magnetic ordering. The chapters treat the backgrou~>d material well and serve as suitable introductions to the various topics. In addition they are well documented with references t o help the reader who wants to go deeper into the subjects. Of value are the rritiral discussions of the shortcomings of the experimental data or theories arid ~~
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