Prevention and Treatment of Parasites. 107 



may invariably be certain that stomach worms 

 are at work in the sheep. This pale condition is 

 due to the fact that these worms suck all the blood 

 out of the animal, and it will finally die because of 

 this loss of blood. When lambs which are badly 

 infested with these worms are killed they have 

 been found to have scarcely any blood left in them. 

 Stomach worms are only found in the fourth 

 stomach of the sheep. When this stomach is care- 

 fully opened a dark brown fluid will be observed, 

 which contains thousands of little worms of a red- 

 dish color, about three-fourths of an incli or an 

 inch long and as thick as a hair. This mass of 

 worms is responsible for the death of the lamb. 

 It may be in place to repeat here that older sheep 

 are not subject to stomach worms as commonly 

 as are lambs, but the writer wishes it clearly un- 

 derstood that older sheep are not entirely exempt 

 from these pests. As far as is known these worms 

 get their start in the body of the older sheep and 

 pass out in the droppings. It is thought that when 

 these worms leave the sheep they are loaded with 

 eggs which soon hatch. The young worms do not 

 stay down on the ground but seek a temporary 

 abode on the stems and leaves of grass and are 

 thus swallowed by sheep grazing thereon. These 

 worms are perhaps thickest around the shade trees 

 in pastures, where sheep spend most of their time 



