44 THE DOMESTICATION OF ANIMALS 



simple curve. On the other hand, both sexes of Black-faces 

 almost invariably carry horns which spring horizontally from 

 the skull and are curved ; but those of the ram are especially 

 luxuriant, the horns being rough, strongly ridged; And form- 

 ing corkscrew spirals, the forward directed points of which 

 have frequently to be cut in old rams to allow them to feed 

 comfortably. Professor Ewart regards these peculiar horns 

 in the Black-face as evidence of the presence in the breed 

 of the blood of the Argali (Ovis ammon) the magnificent 



Fig. 8. Cheviot Sheep a modern result of selective breeding. 

 (Champion, Highland Show, 1914.) 



wild sheep of the Pamirs, Tian-Shan and Altai Mountains 

 of Asia. 



In both Cheviots and Black-faces, the tail is much longer 

 than that of wild sheep, but while in Black-faces it reaches 

 not lower than the hocks, in Cheviots it is so abnormally 

 lengthened that it is found advisable to dock it. 



Both breeds have gained in size of body as compared 

 with the primitive domestic races of Scotland. But though 

 the Cheviot is the larger and heavier of the two (a fat tup 

 weighing at least 200 Ibs. live weight), the Black-face is the 



