SKIN FRICTION MEASUREMENTS 51 ACKNOWLEDGMENTS The help of Mr. M. Pesce and Ms. Hodges is acknowledged. The cooperation of Mr. R. Jernal of Haake, Inc. is appreciated. REFERENCES (1) F. P. Bowden and D. Tabor, The Friction and Lubrication of Solids, Part 1, Oxford University Press, Ox- ford, England 1964. (2) F. P. Bowden and D. Tabor, The Friction and Lubrication of Solids, Part 2, Oxford University Press, Ox- .ford, England, 1964. (3) E. Rabinowicz, Friction and Wear of Materials, Wiley, New York, 1965. (4) A. W. Adamson, Physical Chemistry of Surfaces, Interscience, New York, 1967. (5) J. T. Burwell and C. D. Straug, J. Appl. Phys., 20, 79 (1949). (6) T. Fort, Jr., J. Phys. Chem., 66, 1136 (1962). (7) R. C. Bowers and W. A. Zisman, Mod. Plast., 41 (1963). (8) W. B. Hardy and I. Bircumshaw, Proc. Roy. Soc., Ser. A,180, 1 (1925). (9) W. B. Hardy, Collected Works, Cambridge University Press, Cambridge, England, 1936. (10) P. F. Naylor, The skin surface and friction, Brit. J. Dermatol, 67,239-48 (1955). (11) J. K. Appeldoorn and G. Barnett, Frictional aspects of emollience, Proc. Sci. Sect. Toilet Goods Ass., 40, 28-35 (1963). (12) J. K. Prall, Instrumental evaluation of the effects of cosmetic products on skin surfaces with particular reference to smoothness, J. Soc. Cosmet. Chem., 24, 693-707 (1973). (13) S. Comaish and E. Bottoms, The skin and friction--deviations from Amonton's law, and The effects of hydration and lubrication, Brit. J. Dermatol., 84, 34-73 (1971). (14) B. Joy, D. Machin andJ. McGaw, personal communications.