310 DISEASES OF THE LIVER. 



the parasites may be disinfected by adding to it lime, sulphate of iron, 

 or common salt. Common salt and lime spread over the pastm-es 

 has a double beneficial influence, acting both as a manure and as a 

 parasiticide. From May to August is the l)est time for spreading 

 this dressing. 



The fluke embryos are destroyed by 1 to 2 per cent, solutions of 

 common salt, and by f per cent, solutions of lime. 



In over-stocked fields the animals are obhged to graze very close 

 to the ground, and are thus more exposed to infection. Over-stocking 

 should therefore be avoided. Animals should not be left too long on 

 the same ground. If infected they should at once be driven to higher 

 pastures. Eaised water tanks can be placed in the pastures — they are 

 less likely to become infected. Animals from known infected flocks 

 or herds should not be purchased. Livers from infected animals 

 should be cooked or destroyed. If eaten raw by dogs the eggs pass 

 uninjured through the dog's intestine and infect fresh pastures. 



Sulphate of iron distributed in quantities of 250 to 400 lbs. per 

 acre is valuable as a manure, and would probably have a greater 

 eft'ect in destroying the embryos. 



