PARASITISM. 



97 



For the long white worms the treatment must be vigorous 

 and continued. Use three times daily either (i) or (2) as fol- 

 lows : 



(i) Arsenious acid 5 to 10 grains, for ten days, beginning 

 with the smaller dose and increasing gradually to the larger. 

 On the nth day give linseed oil i pint and Croton oil 30 drops. 

 Shake well. The arsenious acid to be well mixed with damp 

 food. 



FIG. 37. HORSE BOTS AND BOT FLY. 

 (B. A. I.) 

 The eggs are deposited on the hairs 

 during the fall. They are taken off by 

 the tongue; hatch and develop in the 

 stomach, intD the bots (lai'vae). 



Or (2) give a cathartic of one quart of linseed oil, feed 

 little or no hay for four days, then give 2 ounces of turpentine 

 in one quart linseed oil on the 5th day and repeat on the 6th. 

 Repeat this whole process beginning on the i6th day, if the first 

 treatment does not seem effective. 



For more extended study of internal parasites see "Common 

 Diseases." 



Tape Worms, {flat zi'onns). — Most serious in sheep, wnich 

 are infested by at least eight species. 



Treatment can only be useful before weakness begins. For 

 large lambs and yearlings, give no food the night before; then 



