THE COMMON SHEEP. 367 



thousands of animalcules., so small as to be scarcely 

 visible to the naked eye. The tcenia cerebralis, that 

 is found in the brain, or in the spinal marrow im- 

 mediately below the brain, occasions giddiness and 

 staggering, and the disease called dunt or rickets, 

 which, if the vessel happen to be broken, is said 

 to be incurable. The latter kind, which chiefly 

 attack yearling Lambs, are each not larger than a 

 grain of sand. A species of gadfly*, in the summer 

 time, deposits its eggs on the inner margins of the 

 nostrils of Sheep, occasioning them to shake their 

 heads violently, and thrust their noses into the 

 gravel. The larvas, or grubs, when hatched, crawl 

 up into the hollows of the forehead, called the 

 frontal sinuses, where they undergo their necessary 

 changes; and then descend, through the nostrils, 

 to the ground, in which they bury themselves, and 

 are at last transformed into flies similar to those 

 from which they were produced f. 



The 



* Cestrus oms of Linnaeus. 



f The general name of the male is ram or tup. From the time he 

 is weaned to the first clipping or shearing, he is called hog, hoggerel, 

 or lamb-hog; after that he is a sliearling, shearing,' shear-hog, or 

 dinmond tup or ram. Then, according to the year in which he is clip- 

 ped or shorn, he is called two-shear ram, three-shear ram, and so on. 

 If the male be emasculated, he is called, whilst sucking, wether-lamb, 

 then wether-hog, until he is shorn, when he takes the name of shear* 

 ling, &c. till shorn a second time, when he is a young wether, or two- 

 shear wether, then three orfour^-shear wether, or more, according to the 



times 



