170 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS The significance of the purity values given is not clear. The data suggest a trend to less purity with age, purity being the degree of closeness with which a color resembles a true spectrum color. Low purity colors are closer to white, gray, or black, and thus younger hair may be more truly colored, less drab, perhaps from the smaller amount of pigment present. (Received August 1, 1968) REFERENCES (1) Danforth, C. H., Hair, Amcr. Med. Assn., Chicago, II1., 1925. (Out of print.) (2) Garn, S. M., Types and distribution of hair in man, Ann. N.Y. Acad. Sci., 53, 498 (March 27, 1951). (3) Montagna, W., and Van Scott, E. J., Chap. 3, in Montagna, W., and Ellis, R. A., The Biology of Hair Growth, Academic Press, New York, 1958. (4) Wynkoop, E. M., Study of the age correlations of the cuticular scales, medullas and shaft diameters of human head hair, Am. J. Phys. Anthropol., 13, 177 (July- Sept., 1929). Trotter, M., The form, size and color of head hair in American whites, Ibid., 14• 433 (July-Sept., 1930). Trotter, M., and Dawson, H. L., The hair of French Canadians, Ibid., 18• 443 (Jan.-March, 1934). Trotter, M., Duggins, O. H., and Setzler, F. M., Hair of Australian aborigines, Ibid., U.S., 14, 649 (1956). Trotter, M., and Duggins, O. H., Index and size of hair of children, Ibid., 6• 489 (Dec., 1948). Duggins, O. H., and Trotter, M., Medullation in hair of children, Ibid., 8• 399 (Sept., 1950). Hausman, L. A., Recent studies of hair structure relationships, Sci. Monthly, 30• 258 (1930). Hausman, L. A., Applied microscopy of hair, Ibid., 59• 195 (1944). Noback, C. R., Morphology and phylogeny of hair, Ann. N.Y. /lead. Sci., 53• 476 (March, 1951 ). Trotter, M., and Duggins, O. H., Cuticular scale counts of hair of children, Am. ]. Phys. Anthropol., U.S., 8, 467 (Dec., 1950). Duggins, O. H., and Trotter, M., Changes in morphology of hair during childhood, Ann. N.Y. Acad. Sci., 53, 569 (March, 1951). Fourt, Lyman, private communication unpublished data. Rutherford, T. A., and Hawk, P. B., A study of comparative chemical composition of the hair of different races, ]. Biol. Chem., 3, 459 (1907). Wilson, R. H., and Lewis, H. B., The cystine content of hair and other epidermal tissues, Ibid., 73, 543 (1927). Clay, R. C., Cook, K., and Routh, J. I., Studies in the composition of human hair, J. Am. Chem. Soc., 62, 2709 (1940). Koyanagi, T., and Takanohashi, T., Cystine content in hair of children, Nature, 12, No. 4801, 457 (Nov. 4, 1961). Block, R. D., and Lewis, H. B., The amino acid content of cow and chimpanzee hair, J. Biol. Chem., 125, 561 (1938). Flesch, P., The cystine content in colored and white hair of mottled animals, J. Invest. Dermatol., 14, 157 (1950). (5) (6) (7) (8) (9) (lO) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)

ADULT AND CHILDREN'S HAIR 171 (22) Wolfram, L., and Lennhoff, M., The cystine content of hair: fiber-to-fiber variation, Textile Res. J., 37, 145 (1967). (23) Ogura, R., Knox, J. M., Griffin, A. C., and Kusuhara, M., The concentration of sulfhydryl and disulfide in hmnan epider•nis, hair and nail, J. Invest. Dermatol., 38, 69 (1962). (24) Eckstein, H. C., The cholesterol content of hair, wool, and feathers, J. Biol. Chem., 73, 363 (1927) Nicolaides, N., and Roth•nan, S., Studies in the che•nical cron- position of hmnan hair fat, J. Invest. Dermatol., 19, 389 (1952) Washburn, S. L., and Liese, G.J., The cholesterol content of hu•nan sebmn, J. Lab. Clin. Med., 41, 199 (1953). All in Rothman, S., Physiology and Biochemistry o[ the Skin, Univer- sity of Chicago Press, Chicago, II1., 1954. (25) Nicolaides, N., Chemical composition of hmnan hair fat, y. Invest. Dermatol., 21, 9 (1953). (26) Bean, R. B., Hair and eye color in old Virginians, Am. J. Phys. Anthropol., 20, 171 (1935). (27) Trotter, M., Classification of hair color, Ibid., 25, 237 (1939). (28) Steggerda, M., Change in hair color with age, f. Heredity, 402 (1941). (29) Garn, S. M., Human hair: Its composition, anatomy and distribution, Ph.D. thesis, Harvard University, April, 1948. (30) Gardner, B. B., and MacAdmn, D. L., Colori•netric analysis of hair color, Am. ]. Phys. Anthropol., 19, 187 (1934). (31) Flesch, P., and Roth•nan, S., Isolation of an iron pigment frown hmnan red hair, J. Invest. Dermatol., 6, 257 (1945). (32) Flesch, P., Esoda, E. J., and Katz, S., The iron pigment of red hair and feathers, Ibid., 47, 595 (1966). (33) Den Beste, M., A new reflectometer, in preparation.