136 



Control of Parasites 



during the early part of the season. This may, in a dry 

 season, be effected by spraying a second time after two 

 weeks, but if the season is rainy as many as three or four 

 applications may be needed before the first of July, 



Fig. 48. — Barrel pump for spraying. 



Arsenate of Lead mixture: Dissolve eleven to twelve 

 ounces of acetate of lead (sugar of lead), costing twelve to 

 fifteen cents per pound, in four c^uarts of hot water in a 

 wooden pail, and four ounces of arsenate of soda (96 per 

 cent, pure), twelve to fifteen cents per pound, in two quarts 

 of water. For use, dilute at the rate of four to six pounds 

 in a hundred gallons of water, the larger quantity for elm- 



