44 Farmers’ Bulletin 1150. 
the omentum, or the liver. The nodules may be small, elevated ob- 
jects, or may be larger and contain cheesy or limy matter, white, 
greenish, or yellowish in color. These nodules are sometimes mis- 
taken for lesions of tuberculosis, a disease almost unknown in sheep. 
Treatment.—As yet we have no satisfactory treatment for this 
disease. The larval worms in the nodules are beyond the reach of 
any remedies as yet known to us. Even the adult worms in the large 
intestine are difficult to remove. There is some difficulty in getting a 
suitable drug past the four stomachs of a ruminant and into the 
large amount of food matter in the large intestine in sufficient 
strength to remove these worms. Experiments in the Bureau of 
Animal Industry have indicated that gasoline, in doses up to an 
ounce, given in milk, may remove some of the worms, but in half- 
Fic. 27,—Sheep intestines showing lesions of nodular worm disease. 
ounce doses may fail to remove any. Gasoline is a rather dangerous 
substance owing to its inflammability and the danger of getting it 
into the lungs and killing the sheep, and the efficacy noted is so low 
as hardly to warrant its use. 
Prevention.—Pasture rotation, as given in the case of the stomach 
worm, is a valuable control measure. Dalrymple found that he could 
practically prevent the nodular-worm infection of lambs by raising 
them in bare lots, where there would be no temptation to graze and 
where surroundings would be unfavorable for the development of 
the parasite. The ewes were let into these lots whenever necessary 
to nurse the lambs. The lambs were given other feed from raised 
racks and watered from raised troughs. The racks and troughs 
were protected from fecal contamination and the floor of the yard 
