THE QUANTITATIVE DIFFERENTIATION 343

344 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS case to the younger group (Table 3, Fig. 9, 10). On doubling the •g-values, the regeneration of skin surface lipid after 1 « hrs. is obtained in/•g/cm% 6O .__ 50 •- 40 • 30 ,_ 20 ...o •o z o • age: 17- 35 years ß ß age: )35 years )35 years 17 - 35 years 0-41 55-68 87-106 138 42-54 69-86 107-138 2 p.g fat / crn Figure 9 6O • 50 [ ["'• •age:17-35 years ß •_ I/\ •-- age: )35years • 30 -35 years • •o z o o-41 55-68 87-1o6 138 42-54 69-86 lO7-138 Kg fat/cm 2 F•urelO The fact that fat regeneration decreases with age to a greater extent in females than in males is in accord with other findings (1) (2). Whether or not the curve for the younger females is really double-peaked- thereby indicating 2 distinct groups- remains to be seen as measurements with a larger number of patients than the 48 we studied are necessary. 2. Influence of temperature on the regeneration of fat The regeneration of fat at room temperature in 8 patients after &fatting with alcohol was investigated by measurements at 10 rain intervals. These