252 SKIN, HAIR, AND NAILS, BY ALFRED BIESIADECKI. 



of the hair, at a point above the papilla that does not exceed 

 the length of the papilla itself. 



At still another plane (fig. 202) the transverse section of 

 the hair exhibits the substance of the hair, composed of a rigid, 

 horny, homogeneous material, in which small round nuclei 

 appear (e, the transverse sections of the nuclei of the hair cells). 

 The periphery is more transparent, and is indistinctly striated 

 (h, cuticle of the hair). This is invested by a single series of 



Fig. 202. 



Fig. 202. Section of a hair below the level of the neck of the hair 

 follicle, a, External sheath of the hair follicle, with transversely 

 divided bloodvessels b ; c, internal sheath of the hair follicle ; d, 

 vitreous layer of the hair follicle ; e, external root-sheath ; /, scales 

 of the internal root-sheath of Heiile ; 0, sheath of Huxley ; /i, cuti- 

 cula ; I, hair. 



bright rigid cells, that include shrivelled nuclei (g, Huxley's 

 sheath). Outside these are the nucleated cells (/) of the internal 

 root-sheath of Henle, and the epithelial cells of the external 

 root-sheath (e). Here the section has struck the shaft of the 

 hair at about the end of the middle third of the hair follicle. 



In other sections of the hair the cells of Huxley's sheath are 

 destitute of nuclei (as in fig. 195), and can no longer be dis- 

 tinguished from the cells of the internal root-sheath, so that a 



