5:20 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS specialized book, as indicated by the author in the foreword: "Full coverage of the whole question of elastase action has recently appeared in two ad- mirable reviews by Mandl (ddv. Enzymol., 23, 163-264 (1961)) and Loeven ("The Enzymes of the Elastase Complex," in In- ternat. Reviews Connective Research 1, 1963, D. A. Hall, ed., Academic Press, N.Y.). By their very na- ture, however, these reviews were truly impartial and it is my hope that the admittedly more partisan approach which I have made in the present monograph will, if only by posing controversial hy- potheses, act as a starting point for further discussion." It is thus evident that the com- plex problem of the composition of elastase and of its role in aging phenomena in connective tissue is assessed differently by various work- ers. The book here reviewed de- votes only 18 pages to dicsussion of elastolysis and the aging process. The remainder of the text concerns itself with the nature of elastic tis- sue, the elastolytic enzymes, and the inhibitors of such enzymes. Most studies of elastolysis have been carried out on the elastic tis- sue of the intima, or innermost layer, of arteries. As noted by the author (p. 43), the tissue com- ponent called elastin, on the basis of its histological appearance, may have a highly varied composition. Most studies on the composition of elastin have been made on material derived from the nuchal ligaments of beef cattle. It is questionable how much of the data reported for arterial intima and for nuchal liga- ments could be utilized in studies of the elastic tissue of the skin. An understanding of the changes occurring in aging skin would, of course, be of immense value to the cosmetic chemist. The work under review makes it painfully clear that such understanding is likely to come only after the cosmetic industry has undertaken its own investigation of the aging process in skin. Hall's book would be of great value in preparing for such work. Most cosmetic chemists would probably obtain a broader back- ground by reading first the 1963 book edited by Hall (cited above), which examines all components of connective tissue. The 1964 book, here under review, would then round out the picture of the tissue that underlies so many of our efforts.-- PAVL G.I. LAVFF•.R, Cheesebrough- Pond's Inc. VISCOSITY AND FLOW MEASURE- MENT--A LABORATORY HANDBOOK OF RHEOLOGY by J. R. van Wazer, J. W. Lyons, K. V. Kim, and R. E. Colwell. Interscience Publishers, Inc., New York, N. Y. 1963. 406 pages. Price $14.00 The apparent purpose of this book was to present rheological theory, not comprehensively but as a background for a better under- standing of basic principles involved in laboratory rheology instrumen- tation and practice. To this ex- tent, the book is more than moder- ately successful. The first chapter, entitled "Fundamentals of Rheol- ogy," deals with basic theory of elasticity, viscosity and the mathe- matical theory of flow. The dis- cussion of elasticity is a. noteworthy achievement of conciseness and clarity. The concepts of viscosity are explained in a somewhat less complete manner but are still lucid and thorough. The mathematical theory of flow, which follows, is too brief, probably in an attempt to avoid lengthy derivations. As a result, it serves more as a distrac- tion than an aid to understanding.

BOOK REVIEWS 521 The second chapter covers the principles of rotational viscometry thoroughly and well. The section on general design principles is es- pecially valuable to the rheologist as a check-list for instrument evalu- ation. The third, fourth and fifth chapters describe and compare com- mercial rotational, capillary and mis- cellaneous types of viscometers, re- spectively. The treatment is full and detailed, including the usual experimental procedure for each, suggested modifications and in- tended uses. The disadvantage of the description is that not all points of comparison are touched for all instruments. The final chapter discusses visco- elastic phenomena. The handling of this subject is quite capable. It will probably not be of value to the cosmetic chemist unless he has re- duced his knowledge of the basic concepts of simpler types of flow to familiarity. The cosmetic chemist will find the major deficiency of the book to be the emphasis on mathematical treat-- ment at the expense of an explana- tion of flow phenomena on a molecu- lar structure basis (an emphasis in- tentionally placed by the authors). Also, the description of emulsion types and problems associated with different flow and viscosity patterns is hardly touched. The point of view is generally not that of the emulsion chemist, as is to be ex- pected by the background and aims of the authors. Nevertheless, the book is valuable for its clear, con- cise treatment of rheology from theoretical and instrumental as- pects. Other good features are its freedom from errors, an explanatory table of symbols, a comprehensive bibliography and a fair index. It is a text worth having.--H. JAss, Revlon, Inc. NEw GF. RMAN-ENoL•SH DICTIONARY FOR CHEMISTS by H. H. Neville, M. C. Johnston and G. B. Boyd, D. Van Nostrand Co., Inc., Princeton, N.J. 1964. 330 pages. Price $8.95. Despite the similarity of titles, this dictionary differs from most German-English dictionaries for chemists because it includes an unusually large number of non- technical German words. In order to keep the size of the dictionary within practical limits, some tech- nical terms were necessarily de- leted from this volume. In the opinion of the reviewer this re- duction in size has been achieved by deletion of words which are practically identical in both lan- guages and thus does not detract from the comprehensive scope of this dictionary. A quick count indicates that there are approximately 35,000-40,000 entries, significantly fewer than those in many standard dictionaries designed for use by chemists. Nevertheless, this dictionary should be satisfactory for the needs of all chemists who have only a passing acquaintance with the German lan- guage. The readability of the dictionary might have been improved through use of larger type, and a slightly bet- ter grade of paper might have been used. These comments in no way impair the utility of this volume, and it can be unequivocally recom- mended to those who have need for a German-En,•,lish dictionary.--M. M. RIEGER, warner-Lambert. THE PROTEINS--CoMPOSITION, STRUCTURE AND FUNCTION, Vol. I., edited by Hans Neurath, Academic Press, New York 3, N.Y. 1963. 665 pages illustrated and indexed. Price $22. To classify this book as the second edition of this classic by Neurath is