142 THE AMERICAN APPLE ORCHARD 



tent caterpillars, for example, it may be made up as 

 follows : 



4 ounces paris green 

 50 gallons water 



The paris green will mix readily with the water, 

 but does not dissolve. It is best to make up a paste of 

 the green with a little water before putting it into 

 the barrel. Some men find it advisable to add a small 

 amount of lime, but with pure paris green this should 

 not be necessary. 



ARSENATE OF LEAD 



In one form or another the arsenate of lead is largely 

 taking the place of paris green. Probably the bulk 

 of the spraying done by the largest and most up-to- 

 date operators is done with this insecticide. It may be 

 made from the following recipe : 



4 ounces arsenate of soda (50% strength) 

 ii ounces acetate of lead 

 150 gallons of water 



Put the arsenate of soda into a wooden pail with 2 

 quarts of water, and the acetate of lead in another 

 wooden pail with 4 quarts of water, preferably 

 warm. As these substances are very poisonous, it will 

 be as well not to use a milk pail or one commonly used 

 for the family drinking water. When the chemicals in 

 both pails are dissolved mix them together with the 

 150 gallons of water, and the whole is ready for use. 



Most fruit growers prefer to buy their arsenate of 

 lead ready made. Some of the commercial brands 

 appear under trade names, as, for example, Bowker's 

 "Disparene," which is simply an excellent grade of 

 arsenate of lead. The ready-made article costs from 



