THE INTEGUMENTS AND CLOTHING OF MAMMALIA. 



157 



In the Seal, the wool is abundant beneath the compact hairs, and is 

 exceedingly fine, but the serrations are few, and far apart; the hair, 

 having about nine times the diameter of the wool, is beautifully covered 

 with scales, but there is not the vestige of a serration (fig. 164). 



In the wool of the Bear (fig. 165), which is very fine, the serra- 

 tions were found to have a curious character ; " they resembled so 



Seal's hair, a, and wool, 



The wool of the Bear 



166 



The wool of the Wolf-dog-, transparent. 



167 



The wool of the Wolf-dog-, opaque. 



many spires, projecting at irregular distances, and at an exceedingly 

 acute angle." In the Italian Wolf-dog (which has a considerable portion 

 of short wool beneath the hair), the serrations of the wool were found 

 by Mr. Youatt to be " superficial, and irregularly placed ; some of them 

 resembling small spines, and others looking like rounded prominences." 

 When viewed as an opaque object, the cup appeared to be " composed 

 of two, and sometimes three, leaves, with rounded extremities." (Figs. 

 166, 167.) 



The wool and hair of the Tiger are here represented (figs 168, 169). 



168 



The wool of the Tig-ei- , transparent. 



169 



The hair of the Tiger, transparer 



" The wool is beautifully fine ; it is only the thousandth part of 

 an inch in diameter ; its serrations are likewise numerous, amounting 

 to 2560 in the space of an inch. The hair is covered with scales, 

 resembling those on the back of a Sole, but with no serrations." 



The differences, then, between wool and hair, according to Mr. 

 Youatt, are as follow : The fibre of wool is crisped, or curled, the 

 curls increasing according to the fineness and felting property of the wool ; 



