THE STRUCTURE OF SKIN 23 SLIDE 22 Coarse scheme of hair cycle. From Sch•vanitz (386). (Repro- duced by permission of Springer-Verlag.) SLIDE 23 Dopa stain, showing dopa-positive cells in basal layer.

24 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS mechanism of skin colour inheritance which enables two coloured (half- bred) persons to produce an occasional pure white or pure black child. (Slide 23) It has been possible in this lecture to deal with only a very few aspects, and those only briefly, of skin structure and function, but it is hoped that all those present have been able to find something in this discourse which has been of interest to them. Acknowledgement I am indebted to Prof. W. Montagna and the Academic Press of New York for permission to reproduce Slides 2, 3, 4, !1, !2, !3, 14, 15, !6, 18 19, 20 and 21, from the book "The Structure and Function of Skin." Similarly, my thanks are due to Dr. Stephen Rothman and the University of Chicago Press for permission to reproduce Slides 1, 5, 6, 7, 9, 10, 17, 22 and 23, from their book "Physiology and Biochemistry of Skin."