Diseases 285 



aflFect the flock ; hence the best disposition to make of 

 it is to send the flock to market. The worms are 

 communicated to lambs through the medium of the 

 grass and first pass to the stomach. It is while the 

 young are in the stomach that they may be destroyed 

 by medicine, the same as prescribed for stomach and 

 intestinal worms. 



Gruh in the head. — One of the bugbears of many 

 flockowners is the grub of the gadfly. The fly is 

 somewhat smaller than the blowfly and moves so 

 rapidly as almost to elude detection. During mid- 

 summer it harasses the flock by darting into the nos- 

 trfl and depositing the minute grubs. These crawl 

 up the nostril to the end of the passages and attach 

 themselves to the mucous membrane. There they 

 pass one stage of their development. During this 

 period, they do not seriously injure nor are they a 

 serious annoyance to their host. It is only when 

 they have reached their stage of development for 

 changing their habitat, and begin to move about, 

 that they annoy the sheep. The sheep then sneezes 

 violently, rears upon its hind feet, and appears in 

 great distress. Its distress, however, is not as great 

 as its behavior would indicate. The grub really does 

 no injury. On the other hand, I do not think, as 

 some have contended, that it is beneficial. But I am 

 sure there is no call for any attempt to dislodge the 

 grub. Any treatment with that end in view, such 

 as pouring turpentine or coal oil into the nostrils, is 



