Prevention and Treatment of Parasites. 127 



starts in sheep husbandry, is in earnest about it, 

 and wants to do the best he can. The first summer 

 he keeps sheep may be a very favorable one and 

 everything may run smoothly throughout the sea- 

 son. The next year the season may be much dif- 

 ferent, but he fears nothing because he had no 

 trouble whatever the first year. Some day he will 

 find a stumbling block in his way, which he has 

 not seen or heard of up to this time. He may find 

 one or two of his sheep lying dead in the pasture. 

 He makes an examination, and behold, what meets 

 his eye? Thousands and thousands of little white 

 maggots are having a feast on the dead sheep. He 

 now begins to wonder what could have been the 

 trouble with his sheep. It is a puzzle to him 

 whether these maggots got on to the sheep after it 

 had died, or whether they got on while it was still 

 alive and then killed it. Only a few years ago a 

 farmer came to this Station and asked for infor- 

 mation concerning the cause of the death of thir- 

 teen head of sheep, which he thought were eaten 

 up by worms. The writer asked the question: 

 "Where were the worms that killed your sheep, 

 inside the sheep's body or on the outside?" The 

 farmer replied that many little white worms, about 

 half an inch long, were seen on the outside of the 

 sheep. Evidently maggots were at work on his 

 flock and he did not know it, as he stated that he 

 had never heard of maggots killing sheep. 



