Prevention and Treatment of Parasites. 119 



for them. The tar will keep the flies away from 

 the sheeps' noses, and in fact away from any place 

 where it is present, for flies despise pine tar. 



It is important to see to it that sheep have free 

 access to salt at all times of the year, whether they 

 are in the barn or on pasture. This salt, however, 

 should be placed in a salt box and not thrown on 

 the ground, as some careless flockowners do. In 

 summer smear the bottom and sides of the salt 

 trough with a heavy coat of pine tar, and then 

 sprinkle the salt on top of it. In licking up the 

 salt sheep cannot avoid getting some tar on their 

 noses, and herein lies the whole secret of this 

 method of preventing grubs. The flies will now 

 no longer bother their noses. This is a simple but 

 effective method of preventing grub in the head. 

 Rock salt, of course, can not be used for this pur- 

 pose, but common salt is now so cheap that it 

 hardly pays to use the rock salt anyway. 



In Canada the writer has seen still another 

 method practiced. A log is selected and holes 

 bored into it with an auger, each hole being wide 

 and deep enough so that the sheep can get its nose 

 into it nearly up to the eyes. These holes are about 

 three feet apart. They are smeared on the inside 

 with a heavy coat of pine tar and the holes are 

 filled up with salt. In this manner the sheep get 

 even more tar on their noses than they will in 



