516 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS of infection, the use of institutionalized subjects may well lead to unrecog- nized bias in the findi•vgs the absence of simultaneous controls could like- wise be expected to limit the valid,ty of any conclusions drawn, partly be- cause there would be no possibility of evaluating treatments on a double- blind basis. Apropos the disputed periodicity of dandruff scaling, the connection be- tween number and frequency of observations and the ability to register fluc- tuations should be mentioned. Obviously the spacing of observations cotfid easily influence conclusions reached on the extent of fluctuation we have simply reported what we have seen with frequent observations in prolonged studies. The fluctuating scaling thus recorded is in accordance with the ex- perience of many lay volunteers, who claim that their scaling does indeed fluctuate considerably. N. J. VAN ABBE P. M. DEAN Beecham Products Randalls Road Leatherhead, Surrey Great Britain REFERENCES (1) Kligman, A.M., Marples, B. B., Lantis, L. B., and McGinley, K. J., Appraisal of efficacy of antidandruff formations, J. Soc. Cosmet. Chem., 25, 73 (1974). (2) Van Abbd, N.J., and Dean, P.M., The clinical evaluation of antidandruff shampoos, Ibid., 18, 430 (1067).

Book Reviews McCuTCHEON'S DETERGENTS AND EMULSIFIERS, 1973 ANNUAL, NORTH AMERICAN EDITION. McCutcheon's Division, Allured Publishing Corp., New Jersey, 1973. 224 pages, in- dexed. Price $10.00. Also, 1973 AN- NUAL, INTERNATIONAL EDITION. 80 pages, indexed. Price $6.00. This year brings a two-volume publication which, as in the previous editions, very thoroughly lists the detergents and emulsifiers available. As in previous editions, classification is by trade name, manufacturer, class and formula, forms available, and recommended use applications. The North American Edition is classified into five sections. A new section includes "experimental sur- factant materials" but unfortunate- ly consists of only two pages with a minimum of informati.on for those products listed. Perhaps this new section will be expanded in future editions with the inclusion of results from irritation and toxicity tests per- formed on these experimental sur- factants. The HLB Index has been expanded t•o include approximately 1150 compounds which range from a low value of 0.5 to a high value o{ 80.0. The product listing section in- cludes such terms as "toxicologically suitable for cosmetic use" (page 51), "non-irritating foam booster" (page 109), "n o n- t o xi c characteristic" (page 129) which are vague and in- complete. A separate heading should be provided for irritancy and toxicity information for those manufacturers who deem it essen- tial in the product description. The International Edition is a mini-version of its older brother and contains two sections, namely (1) Product Listing and (2) Company Index by Country. Hopefully this edition will be expanded in the next edition. For the chemist or formulator who needs a handy reference for de- tergent and emulsifier materials, this book will serve as a ready reference. -A. IANNACONE--New York, N.Y. ALLYL COMPOUNDS AND THEIR POLY- MERS (INCLUDING POLYOLEFINS) by C. E. Schildknecht, John Wiley and Sons, Inc., New York, 1973. IX + 736 Pages, indexed. Price $29.95. This book by Dr. Schildknecht, consultant and professor at Gettys- burg College, Pa., surveys for the first time the preparation and the properties of allyl compounds and their polymers together with their applications in plastics, fibers, syn- thetic rubber, and adhesives. As is well known, numerous monomeric allyl and related compounds are 517