HAIR. 279 



mined : thus in the majority of them it is stated to be easy to 

 detect the vessels and nerves of the papillae on which the bulb 

 rests, and which penetrate into it : nerves have been detected 

 by Eble in the cat *, by Rapp in the seal, porcupine, and 

 many other animals f , and by Grerber in the pig. if 



In the hairs of the musk deer there seems to be no separa- 

 tion of parts into scaly cortex, fibres and medulla, the entire 

 hair being uniformly cellular. 



In that of the sable the fibrous portion is absent, and there 

 is only scaly cortex and cellular medulla. 



In the hairs of most rodents the medulla is divided by dis- 

 sepiments, and in other animals, as the sable, it is composed 

 of large and distinct cells. 



The hairs of the mouse, bat, and martin are branched or 

 knotted. 



In the spines of the porcupine and hedgehog the inner 

 bark penetrates in longitudinal bands into the cavity of the 

 medullary canal, and thus divides the medulla itself into in- 

 complete segments ; the transverse view of such spines repre- 

 sent a starred or rayed figure. 



In birds, hairs are replaced by feathers, which are to be 

 regarded as modified hairs. 



THE USES OP HAIR. 



The uses of hair are manifold. 



In certain situations, as on the head, it is to be regarded 

 as an ornament. 



In other localities, as on the cheeks and chin, it imparts 

 character and expression to the face. 



In others again, as on the pubis and about the genital 

 organs, it serves the purpose of concealment. 

 t 



* Von den Haaren, t. 11. p. 19. 



f Verrichtangen des freuften Nervenpaares, p. 13. 



J Allgemeine Anatomie, p. 79. 



A A 



