198 THE FARM DOCTOR. 



Treatment. — Almost all tlie tonics of the pharmacopceia have 

 been employed with more or less efifect, but all usually fail when 

 many parasites have gained access to the system. The follow- 

 ing is a good example of a tonic mixture : — 



Linseed, rape, pea, oat, barley, or unbolted wheat- 

 flour, . . . . .40 lbs. 



Powdered gentian or anise seed, . , 4 „ 



Common salt, . . . . . 4 „ 



Sulphate or oxide of iron, . . . i „ 



Give half a pint daily to each sheep. 



In all treatment it is essential to remove from the infested 

 meadow to a perfectly dry pasture or salt marsh, on either of 

 which the eggs of the tluke will perish. To turn on a wet fresh 

 pasture is merely to stock that with the parasites. 



Prevention. — Keep sheep on high dry pastures or salt marshes, 

 where the fluke cannot live oui of the body. Feed salt daily if 

 flukes exist to however limited an extent ; this is fatal to the 

 young flukes and will destroy most of them as they are taken 

 in. Thorough drainage of infested pastures will make them 

 wholesome. This may fail when land is subject to inundations, 

 and in this case such land should be devoted to raising hay or 

 other crops Keeping the sheep off the infested fields at nights 

 and until the dews leave tlie grass in the morning will go a long 

 way towards protecting them. In some histances of the intro- 

 duction of this parasite into a new country the contaminated 

 sheep should be destroyed, and the infested pasture with a wide 

 area around it proscribed from being grazed. 



For other parasites of tne liver ^ see general uiUcle on 

 "Parasites." 



