830 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (19) (20) (21) (22) (23) (24) (25) (26) Id., Ibid., 8, No. 7, 33 (July, 1963). Also available as "Freon" Aerosol Report, A-58, E. I. du Pont de Nemours & Co. "Freon" Aerosol Report, A-59, ,4 queous Alcohol Aerosol Fortms, E. I. du Pont de Nemours & Co. Sanders, P. A., Soap and Chem. Specialties, 39, No. 9, 63 (September, 1963). Also available as "Freon" Aerosol Report, A-60, E. I. du Pont de Nemours & Co. Sanders, P. A., Am. Perfumer, 81, 31 (February, 1966). Also available as "Freon" Aerosol Report, A-62, E. I. du Pont de Nemours & Co. Sumner, C. G., Clayton's, The Theory of Emulsions and Their Technical Treatment, 5th Edition, p. 497, The Blakiston Co., Inc., New York (1954). Schwartz, A. J., Perry, J. W., and Berch, J., Surface Active Agents and Detergents, Vol. II, p. 474, Interscience Publishers, Inc., New York (1958). Becher, P., Emulsions: Theory and Practice, 2nd Edition, p. 151, Reinhold Publishing Corp., New York (1965). Bikerman, J. J., Foams: Theory and Industrial Applications, Chapter 4, Reinhold Publishing Corp., New York (1953).

Book Reviews ATOMIC ABSORPTION SPECTROSCOPY, by James W. Robinson, Marcel Dekker, Inc., New York, N.Y. 1966. 204 pages, illustrated and indexed. Price $9.75. Atomic absorption spectroscopy is a relatively new analytical tool but its importance is growing steadily. De- spite the difficulties of interferences by extraneous elements, the rising popularity of this technique is due to its speed and relatively low cost. Atomic absorption spectroscopy is, in effect, the reverse of emission spec- troscopy. The major difficulty is the problem of generating the element (usually metallic) from its compounds before atomic absorption spectros- copy can be carried out. Thus, a large portion of this book is devoted to descriptions of atomizers, i.e., equipment which generates neutral atoms. This book is concerned primarily with practical problems. Accord- ingly, the theory of spectroscopy is deemphasized instead, much space is devoted to equipment and to methods for the determination of about 50 ele- ments. This includes most of the metallic elements which are present in cosmetics either deliberately or as im- 831 purities. It is likely that this tech- nique, for which relatively inexpen- sive commercial equipment is avail- able, will soon receive wider applica- tion in the cosmetic and other indus- tries. This book should prove to be a worthwhile introduction to these newer methods and a practical guide for the analyst.--M. M. RmCER-- Warner-Lambert Research Institute. AOINO, edited by William Montagna, Pergamon Press, Oxford, England. 1966. 237 pages, illustrated and indexed. Price $15. "Aging" is the report of the May, 1964, "Oregon Symposium" it con- tains contributions from some of the foremost authorities in their respec- tive fields. Thus, this reader looked forward eagerly to the task of review- ing this, the sixth volume in Mon- tagna's Advances of the Biology of Skin. Unfortunately, his anticipa- tion was not fulfilled by this book. Publication more than two years later of the papers delivered at a meeting is a delay which materially reduces interest. In the meantime, several of the papers, especially those presenting new findings, have ap-