THE SKIN. 133 



follicle. This inner vascular layer corresponds to the superficial layer 



FIG. 155. PIECE OF HUMAN 

 HAIR. (Magnified.) 



A, seen from the surface ; B, in 

 optical section, c, cuticle ; /, 

 fibrous substance ; m, medulla, 

 the air having been expelled by 

 Canada balsam. 



FIG. 157. SECTION OF HAIR- 

 FOLLICLE. (Biesiadecki.) 



1, dermic coat of follicle ; 2, epi- 

 dermic coat or root-sheath, a, 

 outer layer of dermic coat, with 

 blood-vessels, 6, 6, cut across; c, 

 middle layer; d, inner or hyaline 

 layer ; e, outer root-sheath ; /, g, 

 inner root-sheath ; h, cuticle of 

 root-sheath; I, hair. 



FIG. 156. HAIR-FOLLICLE IN LONGITUDINAL 

 SECTION. (Biesiadecki.) 



., mouth of follicle ; b, neck ; c, bulb ; d, e, dermic 

 coat;/, outer root-sheath; g, inner root-sheath; 

 h, hair ; k, its medulla ; I, hair-knob ; m, adipose 

 tissue ; n, hair-muscle ; o, papilla of skin ; p, 

 papilla of hair ; s, rete mucosum, continuous with 

 outer root-sheath ; ep, horny layer ; t, sebaceous 

 gland. 



