DISEASES OF SHEEP. 91 



The prevention and treatment are exactly as in rot, but 

 e cure is more rarely effected, because the worms cannot 

 ; driven out of the liver. ' In the incipient Stages of the 

 sease, however, a cure sometimes succeeds ; or, in other 

 jrds, it may be brought to a standstill. This is all that 

 necessary, since a few worms are not injurious. In the 

 rers of the most healthy sheep a few worms are frequently 

 und. 



The same remedies as for rot may be employed. Worm- 

 Dod four parts, calamus-root four parts, shining soot from 

 e stove two parts, charred bones one part, and a sufficient 

 lantity of turpentine or hartshorn oil, are mixed, and of 

 is one ounce is given two or three times a week as a lick, 

 ixed with salt and bran. 



As a drink, lime-water, or water containing one ounce of 

 •een vitriol (sulphate of iron) to the pail, is given. 

 If the disease be considerably advanced, the sheep should 

 i sent to the butcher before it loses its flesh and value. 

 such animals should be used for breeding. 



GNAW DISEASE {Hydrocephalus hycla. 



This disease appears most frequently in the second year, 

 irely before the sheep is one and a half years old, and 

 ill more rarely after it has passed the third year. Its 

 ;at is nearly always in the spinal marrow, especially in 

 le croup and loin regions. It manifests itself at first by 

 sry trifling, symptoms, which are easily overlooked. The 

 limal shows a slight weakness in the hind quarters, es- 

 3cially in the root of the tail, and begins to gnaw at its 

 ,vn hind thighs, giving rise to the name, " the gnaw dis- 

 ise." The weakness increases gradually, and with it the 



