80 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS The author writes authoritatively and interestingly. The Fourth Edi- tion while a fairly good revision needs still more up-to-date embel- lishment.--M. G. D•.N. Dm'•.R•.•c¾ EvAnuATIo• A•D T•.STI•, by Jay C. Harris. 210 pages, 71/4 X 5 inches. Interscience Publishers, Inc., New York 1, N.Y., 1954. Price $3.75. This is a well written book on a highly controversial subject. It will be noticed at once that the scope of this manual is much greater than the title implies. Thus, Section II "Screening Tests" covers methods for such properties as acid and alkali stability, surface and interfacial tension, spreading coefficient, lime soap dispersion, wetting tests, foam tests, etc. All of these are of value in determining the usefulness of surface-active agents. This section should also serve as a good source of data on the above properties for Monsanto surface-active agents as no others are mentioned. The sections on detergency itself (soil removal and redeposition) are equally wide in scope. A wide vari- ety of fabrics and methods are given in detail. There is also an excellent section on the cleaning of hard sur- faces. An interesting section on the use of radioactive tracer technique in de- tergency studies is included. This book will be of great value to the novice in detergent evaluation, and for'the old timer pulls together in one convenient source a large amount of widelYe'scattered informa- tion. As the author points out the methods offered have all been used extensively and have demonstrated usefulness. The bibliography is extensive.-- A. J. FRa•z, Colgate-Palmoliye Go. "DIE SEIFE UND IHP. E HERSTEL- LUSO," by Theodore Hempel, Her- bert Manneck, Heinrich Schuck and Max Stein. 7 X 9!/•. inches, 706 pages, illustrated and indexed. Published by Verlag Fur chemische Industrie H. Ziolkowsky K.G.- Augsburg, Germany. Price D.M. 46 (abt. $11). The book gives an account of methods and equipment used by the German soap industry. Procedures used by small and medium sized plants. have been given preferred attenuon. Continuous methods such as they are employed by some of the larger German producers are not always included. As stated in the preface, the theoretical aspects of the field are intentionally ignored, and discussions of soap phases, rancidity, foam studies, micelie phe- nomena, etc., generally found in books of this type, are omitted. With regard to processing of raw materials and the different types of soap products much useful and ac- curate information has been made available to the reader. A great deal of space is devoted to the dis- cussion of soap plant and power house design. Apparatus such as kettles, crutchers, drying equip- ment, mills, plodders, presses, cool- ing frames, and conveying units are discussed in detail. Specific infor- mation on desigfi of soap •boiling ket- tles, plodder nozzles, etc., has been made available. Regarding proc- essing information the chapters on fat and soap bleaching appear of special interest. 'Soft soap making has been emphasized. Typical Ger- man developments such as the 'ap- plication of synthetic fatty acids from intermediates of the Fischer- Tropsch process or the use of methyl cellulose and carboxymethyl cellulose app. ear particularly valu- abl e. The Mazzoni process, which has found acceptance in Germany

BOOK REVIEWS 81 has been described in detail. A very good classification of synthetic detergents and a concise description of their manufacture has been in- cluded. Particularly well described is the sulfo-chlorination according to Reed and Horn. References to the general literature are made but fre- quently are not sufficiently specific. The book should be of value to the European soap technician. To the American reader it discloses a limited amount of interesting data on soap and intermediate products and their processing which are not generally known and which may be important enough to make the pur- chase of this volume profitable.-- H. G. Kt•tSCI•ENBAUER, Colgate- Palmolive-Peet Co. CONDUCTIMETRIC ANALYSIS AT RA- DIo-F•tEO. UENC¾, by G. G. Blake, 109 pages, size 51/2 X 81/2 inches. Chemical Publishing Co., Inc., Brooklyn 2, N.Y. Indexed and il- lustrated. 1952. Price, $2.75. The book consists of nine chapters and an appendix of 25 pages of mis- cellaneous data, almost a quarter of the book. The author supplies a special introduction to the first U.S. edition, summarizing recent and additional knowledge, which is to be studied only after the rest of the book has been read. The book is essentially a study of the author's own methods, which seem well described, though briefly. The author assumes he is address- ing a well-informed audience in the field of electronic instrumenta- tion. Hence the scope of the book is limited. While the applications for radio- frequency methods of analysis are varied, they are in very limited commercial use. This book will serve but a little in expanding this field.--M. G. D•.NAVAaaE. A CONDENSED CHEMICAL DICTION- AP.¾, Francis M. Turner, Editorial Director, 721 pages, 6 X 9 inches. Reinhold Publishing Corp., New York 18, N.Y. 1950. Prices, $10. This is the Fourth Edition of an earlier work, published for the first time in 1919. The text is handled as a diction- ary, giving brief information on each entry. To test thoroughness of coverage of the 23,000 entries, this reviewer tried to find various com- monly used cosmetic materials and their brand names. Everything from Arlex to Zopaque was there. Isolated instances such as Tegin and Protegin were absent but Parasepts, Escolols, Chlorohydrol, and the others were there. Only one proofreader's error was found in the spelling of "glyceryl borate" under Boroglycerides on page 107. The typography and layout are excellent. The presence of trade name is a useful and fairly complete addition. This is a practical book for busy men, technical or not. Everyone should have it.--M. G. D•-NAvAR•E. COLLOID SCIENCe-. Volume I, Ir- reversible Systems. 389 pages. Vol- ume II, Reversible Systems, 753 pages. Edited by H. R. Kruyt. Illustrated, indexed. Elsevier Press Inc., Houston 6, Tex. Price, Vol- ume I, $11 Volume II, $11.50. 1952. Initiated before World War II, these volumes are outstanding be- cause they present studies on the