274 JOURNAL OF COSMETIC SCIENCE

HYDROXY ACIDS IN COSMETIC FORMULATIONS 275 RESULTS The results obtained in this investigation are shown in Tables I and II and Figures 2 and 3. GROUP I (CONTROL) The lining epithelium of the hairless mice epidermis is of the keratinized stratified pavement type. The basal layer is clearly visible, resting on the basement membrane and consisting of low cells with scarce cytoplasm and an ovoid nucleus more lightly stained than the nuclei of more superficial layers. The cells of this layer are well organized and arranged in such a way that the long axis is perpendicular to the basement membrane. .A .. Figure 2. Photomicrographs of skin from a hairless mouse. (A) Control. (B) Application of cream formu- lation. (C) Application of cream formulation containing glycolic acid. (D) Application of cream formulation containing lactic acid. Magnification: x960. Stain: H.E.