938 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Preservation of toiletries and cosmetics, problems involved and methods, 719 Production scale-up, influence of, on quality and properties of cream, 625 Propellants, fractionation of, and effect of valve body orifice size on propellant/ concentrate ratio, 661 in powder aerosols, 553 Propylene glycol alginate, new reactions of, 441 Proteins, in epidermal cells in study of chemical differentiation in epidermis, 583 extraction of, from human epidermis, comparison of several procedures, 169 Radiotracer technique for measurement of abrasion in toothpastes, 595 Retinoic acid, all-trans-, effect on growth and keratinization of hutnan skin epi- thelial cells in vitro, 925 Rheological properties, changes in, due to reactions of propylene glycol alginate with gelatine, polyvinyl alcohol, and starch, 441 of creams, changes in, upon production scale-up, 625 of gelatin and Laponite gels, 427 of semisolids, evaluation using rheome- ters, 645 thixotropic, of inorganic agents, causes of, 347 Rheometers, design factors in theological evaluation of semisolids, 645 Rigidity, ineasurement of, as parameter of rigid gels, 427 Sampling and assessment of powder mix- turcs for cosmetics and pharmaceuti- cals, 259 Semisolids, theological evaluation of, using rheometers, 645 Silylation of hexachlorophene for determi- nation by gas-liquid chromatography, 683 Skin, apparatus for measurement of stiffness and elasticity of, 417 chemical differentiation in epidermis, 583 effect of dimethyl sulfoxide and other re- agents on mechanical properties of, 129 effects of surfactants and solvents on per- roeability of, 853 human, comparison of several procedures for extraction of proteins from, 169 human, epithelial cells, effect of retinoic acid on growth and keratinization of, 925 human, ultraviolet irradiation of, and histidase activity, 817 machine for treatment of, with germicidal solutions, 521 rejuvenation of, 503 rolerance studies using animals, 835 Society of Cosmetic Chemists, Great Britain, Co•nmittees for 1969-70, 2 Officers and Council for 1969-70, 1 Publication Prize, 582 Society of Cosmetic Chemists, USA, Found- ing fathers honored, 606 Literature Award, 624 Medal Award, 182 Merit Awards, 612 Midwest Chapter, 84, 364 Ohio Valley Chapter, 192 Scholarship Grants for 1970, 168, 638, 666 Sodium chloride in germicidal systems de- posited on skin, 52I Sodium pyrrolidone carboxylate as humec- rant to increase softness of skin, 417 Solar simnlator for evaluation of sunscreens, 607 Solids, bulk, effect of glidant addition on v4t flowability of, 483 particulate, continuous mixing of, 3 Solvents, effects of, on permeability of epi- dermis, 853 Spectroscopy, infrared, and column chroma- tography, in analysis of fatty alkanol- amides, 107 Starch, reaction of propylene glycol alginate with, 441 Stiffness of skin, measurement of, 417 Storage systems for particulate •naterials, 53 Substantivity of skin, measurement after ap- plication of germicides, 521 Sunscreens, solar simulator for evaluation of, in guinea pigs, 607 Surface energy of very fine particles and relationship to changes in physical, chemical, and optical properties of dry j state of powder and its dispersion in liquids, 563 Surfactants, concentrations, in emulsions, assay of, 393 effects of, on permeability of epidermis, 853 initial location of, effect on emulsions, 365 Svedberg relations and ultracentrifugation of emulsions for adherence to, 393 Television, closed circuit, -microscope sys- tem, for observation of subcutaneous microvascular responses in bat wing to exogenous agents, 845 Tensile properties, dry, of keratin fibers, prediction of, from wet extension data, 639 Testosterone metabolism in human hair follicles, 901 Thermal analysis, differential, of powdered materials, thermal conductivity effects, 221 Thermal conductivity effects in differential thermal analysis of powdered mate- rials, 221

JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 939 Thickening, agents for, synthetic, evaluation// of, 459 mechanisms of, by inorganic agents, 347 Tolerance of skin to raw materials, animal studies, 835 Toothpastes. See Dentifrices. Torsional measurements on skin, apparatus for, 417 Toxicological study of cosmetics, 313 Trichlorocarbanilide in germicidal systems depositcd on skin, 521 Ultraviolet irradiation, of human skin, and histidase activity, 817 influence on properties of photosensitiz- ing drugs, 155 in phototoxicity studies ooe cosmetic mate- rials, 695, 825 Urea, effect on mechanical properties of stratum corneum strips, 129 in extraction of proteins from human epi- dermis, 169 Urocanic acid, formation of, from histidase and ultraviolet protecting effect of, 817 Valvcs, body orifice, effect of size and ratio of, to vapor top orifice on propellant/ concentrate ratio in aerosol formula- tions, 661 for powder aerosols, importance of, 553 Vascular activity, in cosmetics, 299 micro-, observation of responses in bat wing to exogenous agents, 845 Waxes, natural and synthetic, characteriza- tion of, using combined chromato- graphic techniques, 119