192 PREVENTION AND TREATMENT OF SCABIES. 



pulled out, and with a lens the wool beneath the scab can be 

 looked at for parasites. A scabby flock may appear cured a 

 few days after any preparation has been applied, and the 

 sheep may be at rest and feeding, but this may depend on 

 the living acari having been effectually destroyed, and the 

 eggs are apt to remain untouched. If the preparation used 

 adheres to the fleece, so soon as fresh acari are born they are 

 killed, but with many dips the skin is left clear, and the 

 parasites can again prey on it. The partial cure of scabby 

 flocks is a great cause of the disease being perpetuated in a 

 district, and great attention should be paid to the effectual 

 treatment of any diseased sheep. 



