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



tents of the hair follicle, force the clubbed extremity of the 

 hair, together with the sheath of Huxley, continuously upwards, 

 and so contract that the vitreous membrane presses directly on 

 the papilla ; whilst at a higher point the internal surfaces of 

 the external root-sheath come into contact (fig. 203) 



Fig. 203. 



Fig. 203. Shed hair, after typhus fever, a, External ; 6, internal 

 sheath of the hair follicle ; c, hair papilla ; d, vitreous membrane ; 

 g, external root-sheath ; 7i, club-shaped end of the hair, connected 

 by a cord with the papilla, /; I, external root-sheath terminating 

 on the clubbed extremity of the hair. 



The new hair is developed from the old papilla * Hairs shed 

 in consequence of disease are either not succeeded by new hair, 

 or in their place lanuginous hairs are formed. 



c. NAILS UNGUES. 



The nails are horny, elastic, transparent, concavo-convex 

 laminse, that lie imbedded in folds of the skin on the last 

 phalanges, and cover the greater part of their dorsal surface. 



* Langer, Denkschriften der K. K. Akad., 1850 (fig. 191). 





