22 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS permanently to grow it drops out and is replaced by the lanugo hair previously mentioned. PIGMENTS OF THE SKIN The principal skin pigment is melanin, and different intensities of this pigment produce a variety of shades of skin colour. However, the colour is also modified by varying amounts of the following pigments: oxyhaemo- globin, reduced haemoglobin, carotene, melanoid. There is a complicated SLIDE 21 The distribution of succinic dehydrogenase activity in the bulb of a hair follicle from an albino guinea pig. This is an entire follicle and not a section. The strongest enzymatic activity is seen in the lower portion of the bulb and in the dermal papilla.
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.
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