THE SKIN 99 



tissue has become sufficiently firm. Stain with haBmatoxylin and eosin, and 

 mount in balsam. 



The structure of hairs may be best demonstrated by washing the soap from 

 lather, after shaving, with several changes of water. When clean, decant the 

 water and add alcohol. After twenty-four hours again decant and add oil~of 

 cloves. With a pipette carry a drop of the oil with the deposited hair-cuttings 

 to a slide, remove as much of the oil as possible with slips of blotting-paper, 

 and mount in balsam. Oblique, vertical, and transverse sections maybe readily 

 obtained by this method. 



VERTICAL SECTION OF SKIN FROM THE GROIN 



(Vide Fig. 72) 



OBSERVE : 

 (L.)* 



1. The horny layer of the epidermis. (The stratum lucidum 

 will hardly be demonstrable on account of the thinness of the 

 epidermis in this region.) 



2. The rete mucosum. (The section from which the illustration 

 has been drawn was taken from a negro, and the deep cells were 

 pigmented.) 



3. The sharp line of demarcation between the epidermis and 

 the true skin. 



4. The papillae of the corium or derma. (Note the absence of 

 any sharp line dividing the corium and subcutaneous tissues.) 



5. The larger blood-vessels of the subcutaneous region. 

 (The arteries in transverse sections are plainly indicated by their 

 prominent media, the appearance of the fenestrated membrane as 

 a wavy yellowish line, and by the elliptical or circular outline. 

 The veins are smaller, with thinner walls, and their outline is gen- 

 erally irregular. The smaller veins are commonly overlooked, on 

 account of their lumen having become obliterated by contraction of 

 the tissue in hardening. 



6. Coils and ducts of sweat-glands in subcutaneous region. 

 (The tubes are cut in various directions, and the whole is sur- 

 rounded by dense fibrous tissue, forming a kind of capsule.) 



7. The subcutaneous collections of adipose tissue beneath the 

 last region. (The septa are dense and strong.) 



8. (Having selected a vertical section of a hair-follicle: ) 

 (a) The root of the contained hair. (&) The bulb and the hair- 

 papilla, (c) The medulla of the hair, (d) The root-sheath pro- 

 longed from the rete mucosum. (e) The fibrous (outer) sheath. 



*Low-power i. e., from thirty to sixty diameters. 



