496
JOURNAL O F CHEMICAL EDUCATION
This book is a companion to Volume I , "Macroscopic Theory of Superconductivity." A two-fluid mechanism haa been employed
other and coexist in ever) small volume of the-system. The superfluid state arises from the small mass of helium, the loti intermolecular attraction. e a u ~ l e dwith the eondens&tion oh+
theoretical treatment can only come with new methods for treating the many body problem. Anyoneinterestedin the theory of low-temperature phenomena will not want to be without this eaactina hut excellent hook. HENRY EYRING
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SILICONES AND THEIR USES
Rob Rov McGreoor. Administrative Fellow. MeUm Institute. ~ c ~ r a w : ~ ~i lo lo k - ~ d Inc., ., New York, 1954. xv 302 pp. 15 X 21 cm. $6.
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THEvery rapid expansion of the silicones industry during the last decade has been due to the wide variety of uses for thest, interesting and unusual materials. Today silicones me used in one form or mother in almost every industry. Since the silicones are still relatively new materials whieh are being used by nonspecialists in diverse applications (which will certainly be expanded), there exiskd a real need for an extensive treatment of the properties and uses of the silicones, written p i marily for the nonspecialist who is a potential or actual user of silieones. The need has been admirably filled by this hook. Dr. McGregor has been intimately associated with the silicones industry from its inception and has written well on a subject with which he is obviously thoroughly familiar. The subject matter of the hook may he indicated by listing the chapter headings: I, History of Silicones; 11, Commercial Silicones; 111, Physiological Response to Silicones; IV, Applications of Silicones to Specific Indn~triesand Cost Considerations; V, Chemistry of Silicone Preparation. In summary, i t seems clear that this hook o m serve excellently as a "practical manual on siliconen for engineers, designers, and others who wish t o use these products." LEO H. S O M M E R Pnnh'snlvmr* STATEUNWERBZTI U ~ r v e n s r ~PABK. r PENNBILV*NL*
point, it will be most useful to those applying the technique and to those requiring a guide to current investigations. For the practicing chemist, this publication provides an excellent summary of theory, procedures, methods, detection techniques, and various applications. I t illustrates the importance of paper chromatography and of electrochromatography an analytical tools in numerous investigations. The authors' experience is reflected in the large space devoted to investigations of proteins and amino acids. Indeed, the first analytical applications of sorptive paper in these fields are regarded as the beginning of paper chromatography even though one-way, two-way, and radial or circular modifications of the techique had already been employed with plant pigments and with dves. ~ l t h b u g hthe numerous modifications of paper ohromatography and their applicability in many diverse fields present great difficulties in the preparation of a concise, coherent book, a great quantity of material has now been summarized remarkably well. Certain aspects of the treatment may, however, he brought into question. The definition of chromatography quoted in the first chapter is inexact and equivocal. The historical treatment of electrochromatography aa well as of paper chromatography is incomplete. Tho restriction of theory to partition chromatography is no longer justifiable. Various terms widely employed for paper electrophoresis are not included. There are few basic rules for operation and application of the techniques, and there are few examples of easily reproducible experiments with readily available materials. In spite of these irksome criticisms, this book is a major contribution to the subject of chramatography. I n this rapidly expanding field it provides a bench mark for the 8UNey of further progress.
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Edited by laques Cattell. Ninth edition. R. R. Bowker Company, New York, 1955. 2180 pp. 20 X 28.5 cm. $20. So GREATLY ha8 the membership of the scientific fraternity increased that some 90,000 names must be included in this ninth edition of a reference book of great value. I t will appear in three volumes of which this, the first, contains over 40,000 name8 of workers in the fields of the physical, mathemfttieal, chemical, and geological sciences. The general policies and format of the earlier edition8 have been followed.
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A MANUAL OF PAPER CHROMATOGRAPHY AND PAPER ELECTROPHORESIS
R. I. Block, Department d Biochemistry, New York Medical College, E. L. Durrum, Department of Pharmacology, Army Medioal Service Graduate School, Walter Reed Army Medical Center, and G. Zweig, Charles F. Kettering Foundation and Antioch College. Academic Press, Inc., New York, 1955. ix 484 pp. 8 5 figs. 104 tables. 15.5 X 23.5 cm. $8.
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THISbook is divided into two parts. The first part (329 pp.) is a revision of the earlier book on paper chromatography by Block, LeStrange, and Zweig. The second part (77 pp.) is contributed by E. L. I)urrum, an expert in the field of differential electrical migration in moist paper. Separate hibliographies are provided for each part, but author and subject indexes are for the two parts. This monograph is the product of specialists in the fields of proteins and amino acids. Written from the specialist's view-
AMERICAN MEN OF SCIENCE. VOLUME I: PHYSICAL SCIENCES
REAGENT CHEMICALS AND STANDARDS
Joseph Rosin. Third edition. D. Van Nostrand Company, 561 pp. 16 X 23.5 cm. $9.50. Inc., New York. 1955. x
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THEearlier editions of this work have long been standard items on the shelves of every analytical Iahoratwy. .4nalytical chemistry has advanced enormously since the last edition (19461, particularly with the development and extension of methods involving spectrophotometry, chromatography, nonaqueous titrations. etc. New reagents and solvents have been introduced, some 45 of which are incorporated in this volume.
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TABLES OF INTEGRAL TRANSFORMS. VOLUME 2
Edited by A. Erd6lyi. McG~aw-HillBook Company, Ine., New York, 1954. xvi 451 pp. 16 X 23.5 cm. $8.
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EXTENDSthe list of integral transforma from Volume 1, and includes many transcendental functiann.
