352 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS BOOK REVIEWS The Principles and Practice of Modern Cosmetics. Volume 1. R. G. Harry. MODERN COSMETICOLOGY. Fifth Edition. Revised by J. B. Wilkinson, and R. Clark, E. Green and T. P. McLaughlin. Pp. xxiv q- 683 q- ILl. (1962). Leonard Hill (Books), Ltd., London. 84s. Few cosmetic chemists can be unfamiliar with Harry's "Modern Cos- meticology" and have not found this volume of some assistance in their work during the twenty-two years since the first edition was published. The need for a fifth edition reflects not only the tremendous advances in cosmetics technology but also the sound basis on which the book is written. The revision has been undertaken by a team of leading workers in cosmetics technology who chose to retain the original basically sound frame- work. At first glance, the fifth edition appears to differ very little from the previous one but closer reading reveals how much thought and work has gone into this new edition. Four chapters have been omitted: On toilet soap--impossible to deal with adequately in a book of this size, and those on diet and skin health, cosmetic stockings, and cosmetic facts and fallacies. A new chapter on "Pressurized Packs" surveys adequately the technical aspects of the aerosol package. Practically every chapter has been revised in some degree but because of changing ideas and importance, some chapters have come in for more drastic changes than others. The basic framework of the book has been retained and the treatment of Chapter 1 "The Skin" illustrates the general pattern of the revision. Much detail of lesser importance has been omitted and the nucleus of basic information rearranged, revised and expanded where necessary to give a sound, logically developed and highly readable account of the basic facts every cosmetic chemist should know about the skin. Chapters 16 "Dentifrices", 21 "Hair Shampoos", 22 "Permanent Waving", 24 "Hair Dressings and Conditioners", 25 "Hair Dyes" and 28 "Antiperspirants and Deodorants" have all largely been rewritten to in- corporate recent developments and ideas. The index is shorter than that in the previous edition and yet seems more comprehensive, indicating the care and selectivity exercised in its preparation. The revisers have done a splendid job and produced a new work which at times differs not so much in the actual information contained therein but in its arrangements, and therefore in the ease with which it can be read and absorbed and a given piece of information found when required.

BOOK REVIEWS 353 The new edition is produced to the usual high standard. Remarkably the revisers have managed to compress this new edition into over one hundred fewer pages than the previous edition but this has not prevented a one-third increase in cost. Nevertheless, at the price this volume repre- sents good value and will undoubtedly be found a worthy addition to every cosmetic chemist's bookshelf. R.P. REEVES. The Principles and Practice of Modern Cosmetics. Volume 2. R. G. Harry. COSMETIC MATERIALS. Second Edition. Revised by W. W. Myddleton. Pp. xv + 803 q- Ill. (1963). Leonard Hill (Books), Ltd., London. 84s. This second edition is presented in an essentially similar manner to the first, i.e. an alphabetical listing of materials with details of synonyms, formula, molecular weight, occurrence or manufacture, physical and chemical properties, B.P. standard, use in toilet preparations and dermatological action. A little over four hundred monographs are included in the main section and, in addition, the Standards and Methods of both the TGA and TPF are reproduced which appear to be complete up to mid-1962. An appendix includes monographs on the FDA approved colours. A!most one third of this volume is devoted to reproduction of these specifications and methods and one wonders whether this is justifiable. The selection of materials for inclusion in this new volume leaves some- thing to be desired. More than thirty monographs deal with materials which the authors state are not used, little used or should not be used in cosmetics. Surely this is sufficient reason for excluding them. To these I would add at least another forty materials which means that more than one in six of the monographs are on materials which are of neg!igible interest to the modem cosmetic chemist. Some of these are perfume and flavour materials and are better left to the specialist works such as Arctander's recent volume but most are adequately, and more aptly, dealt with in the pharmaceutical texts, B.P., U.S.P., B.P.C., N.F., 'Martindale', etc. Some materials omitted are equally perplexing for instance, PCMC and PCMX are included but not DCMX U.S. permitted colours but no mention of British permitted food colours methyl--and benzethonium chloride but not benzalkonium chloride, cetyl and stearyl dimethyl benzyl ammonium chloride nor alkyl pyridinium compounds sodium but not stannous fluoride stearic and palmitic but not other fatty acids hairspray resin Devlex A.515 but not Ciba 325, Resyn 28-1310, Gantrez AN, etc. (the use of ethyl cellulose in hairsprays is not mentioned) menthyl salicy!ate but not its common cheaper alternatives homomenthyl and benzyl salicylates phenylmercuric benzoate and nitrate but not the borate a.s.o.