214 DISEASES DUE TO INTERNAL PAKASITES. 



has sufficient strength to cough them up. This disease appears 

 to be more prevalent some seasons than others, its ravages being 

 more serious after prolonged damp spells, when it is liable to be 

 epizootic, and cause very large losses to the flock-owner. 



Creatment. 



This must be both preventive and curative. As a preventive 

 the sheep, lambs especially, should be moved to fresh pastures. 

 If the season is wet they should be herded on the hill sides, 

 avoiding all low-lying lands as much as possible. Salt seems to 

 exert destructive influence on the parasite; rock salt should be 

 plentifully supplied for the sheep to lick, and dry fodder should 

 be fed if obtainable in which salt has been plentifully sprinkled. 

 The curative treatment, which will be found most practicable, 

 is to confine the sheep in sheds, which are as air-tight as possible, 

 then by burning sulphur in an iron kettle suspended from the 

 roof of the shed just above the heads of the sheep sulphurous 

 acid gas is formed. The inhalation of the fumes will cause 

 violent expectoration on the part of the sheep, the parasites being 

 expelled in the mucus discharges. These fumigations should 

 be repeated three or four times. The safest plan is for an 

 attendant to stand in the shed, and when he finds that the fumes 

 are as strong as he can possibly bear them, to come outside,, 

 bringing out the burning siilphur with him. The sheep should 

 then remain in the shed for a period of ten minutes. This pro- 

 cedure should be repeated the next day, the sheep being com- 

 pelled to inhale the fumes for a longer period, say twenty min- 

 utes. On the third day the fimiigations should again be carried 

 out, which should prove sufficient to greatly relieve if not en- 

 tirely cure the sheep. "When the flock is few in number, so that 

 individual treatment can be instituted, injections of medicinal 



