290 Veterinary Medicine. 



the expulsion of their worms, and should then be turned with 

 their lambs upon a freshly seeded pasture, which has no other 

 source of contamination. 



Young and non-breeding sheep should be similarly treated with 

 vermifuges before being turned out in spring, and should have 

 newly seeded pastures each year. Grass should be made to 

 alternate with other (cultivated) crops, or better with a rotation 

 of cultivated crops so that the worms and ova in the soil will be 

 destroyed by the lack of the necessary ovine hosts. 



When a pasturage is unsuited for cultivation, all sheep and 

 goats should be kept off it for one or even two years, and cattle 

 or horses turned on in place. 



All springy parts of lands previously occupied by infested sheep 

 should be securely fenced against encroachment by flocks. 



All pools and lakes and all shallow open wells on such lands 

 and all rivers that receive drainage from infested or suspected 

 areas should be similarly fenced against the access of sheep. The 

 supply of water from deep springs or wells, the latter well secured 

 by cement against surface leakage, is essential. 



When sheep must be turned on infested pastures, or must 

 mingle with infested or suspected animals, as lambs with ewes or 

 older sheep, they should be kept in folds or on clean pasture in 

 early morning or in wet weather so long as there is danger of the 

 vegetation being torn up by the roots. 



No salt nor other food should be thrown down to be eaten 

 from the ground. A liberal supply of salt in troughs, and, 

 moderately, in drinking water, is very important. 



As in all other dangerous parasites fiock-masters who allow 

 sheep infested with uncinaria to occupy pastures or folds on the 

 line of running streams, or on higher lands that drain over the 

 lower lands of a neighbor, should be held guilty of a misdemeanor, 

 subjected to a penalty, and compelled to abate the nuisance. 

 The sale of such sheep without certifying the purchaser of their 

 condition should also subject him to suit for damages. 



Sclerostoma Hypostomum (hypo-beneath). Body white, 

 cylindroid, rigid. Head bent ventrad. Mouth round, opening 

 downward, with six papillae and a double row of sharp teeth. 

 Buccal cavity with longitudinal chitinous ribs converging to the 

 round oe^ophagean orifice. Male 10 to 20 mm. long, 2 spicula, 



