258 DISEASES OF ANIMALS. 



vator,".that the fly, which is of light drab color, deposits 

 a craiviing maggot at the nose of the sheep. He had 

 taken hundreds of them, alive and active, from flies. 

 His son had them deposited twice at his nose, while at 

 work among the sheep. The flies work in summer, and 

 in the fall till cool weather. The act of depositing is 

 done very quick, and the maggot is ready to pass im- 

 mediately into the head. The only chance to destroy 

 them is during their infancy, before they pass high into 

 the head, which is not under five or six weeks. There 

 are two sets in a year, if not more. Matured ones have 

 been found in the heads of lambs not more than four 

 months old. 



Remedy. He uses tobacco-water with excellent suc- 

 cess, commencing the last of July, and applying it till 

 the last of October, generally three times in the season. 

 Boil one pound of good tobacco in a gallon of water. 

 Turn the sheep on their backs in a little trench dug in 

 the ground, and with the head held back on the ground, 

 inject with some force about a table-spoonful of the 

 liquor into each nostril, pointing the syringe so that it 

 will go into the cavities in the head, instead of falling 

 into the throat. If at first the animals appear sick and 

 cannot stand, they will soon get over it. Two persons 

 will go through with several hundred in a day. 



The most common forms of this disease arise from a 

 collection of water in cysts or bags connected with the 

 brain, on which it acts fatally, by pressure. Lambs 

 and yearlings are the principal sheep liable to this dis- 

 order. 



Cause. It is supposed to be caused by the exposure 

 of the back to cold and wet. Hence it is common to 

 young animals whose wool parts on the back and ex- 

 poses it. It prevails most after wet, cold winters, and 

 in flocks most exposed. 



Symptoms. Dulness ; languid appearance ; ceasing 

 to graze and ruminate ; walking in a staggering 

 mannnerj giddiness: looking wildly; starting ofi" as 



