TEE APPENDAGES OF TEE SKIN. 



905 



The hairs of the tail are the longest and strongest in the body. These par- 

 ticular hairs also grow on the posterior aspect of the limbs, generally from 

 about the knees and hocks to the hoofs ; at the sesamoid bones they constitute 

 a long tuft — the fetlock — which surrounds the horny growth named the " ergot." 

 These " foot-locks " are peculiar to the Horse, and vary in length and coarseness 

 with the breed of the animal.) 



"When the hair is fine, long, and wavy, it f onus ivool ,- and when straight and 

 rigid, as in the Pig, it is known as bristles. 



In the Ass and Mule, the forelock and mane are rudimentary or absent, 

 and the hair of the tail is 

 limited to a small tuft at the 

 extremity of the organ in the 

 former animal ; while in the 

 latter it is much less abundant 

 than in the Horse. 



In the Ox, these hairs 

 are not present, except at the 

 extremity of the tail, as with 

 the Ass. 



There are no other animals 

 which have other hair than 

 that composing the coat. 



(The ordinary hair of the 

 coat is soft and elastic, in- 

 clined in particular directions, 

 and varies in length not only 

 according to the regions of 

 the body on which it grows, 

 but also according to the 

 season or climate. In the 

 Horse, the direction of the 

 hair of the coat gives rise to 

 curiously fonned waves, lines, 

 and circles, the most constant 

 of which is on the forehead. 



In the Cow, the hair is 

 frizzly on the forehead ; on 

 the posterior part of the thighs 

 it has a particular direction, 

 while on the outer side it passes downwards, and from the posterio" part of the 

 mammae it ascends as high as the vulva ; this characteristic disposition forms 

 what the French have termed ecussois, by which some have pretended to recognize 

 the lactiferous qualities of the animal. 



In the Sheep, real hair — not wool — is found on the lower part of the face, 

 and the extremities of the limbs. 



In the Goat, the hairs of the beard are veiy long, and compose a distinc- 

 tive tuft ; this animal has also a fine crisp duvet or dotvn beneath the ordinary hair. 



In the Pig, the bristles are very strong in the region of the back ; in old 

 animals they are usually bi- or trifurcated at their free extremity ; there also 

 exists a fine soft hair on this animal. It has no tentacular hairs. 



HAIR-FOLLICLE. 



1, External dermic layer of the follicle ; 2, internal dermic 

 layer; 3, amorphous lininr of the follicle; 4, external 

 epidermic layer ; 6, hair-bulb ; 7, vascular papilla ; 8, 

 cells of the medullary substance. 



