338 Report of the Horticultural Department of the 



It is very important that the vessels that are used in making or 

 storing this and the preceding poison be plainly labeled and never 

 used for any other purpose. 



ARSENATE OF LEAD. (l) 



Acetate of lead 11 ounces. 



Arsenate of soda 4 ounces. 



Water 50 gallons. 



Dissolve the acetate of lead in 2 quarts of water and the arsenate 

 of soda separately in another 2 quarts. Pour the solutions together 

 into the spraying tank containing the required amount of water. 

 There is formed a white precipitate of arsenate of lead. To make 

 one pound of arsenate of lead, there are required twenty-four ounces 

 of acetate of lead and ten ounces of arsenate of soda. In preparing 

 this poison purchase only first class chemicals. High-grade crystal- 

 lized acetate of lead contains about 58.8 per ct. available lead oxide. 

 Arsenate of soda should not have more than two or three per ct. of 

 chloride. 



Arsenate of lead is less liable to injure the foliage than is paris 

 green and on account of its color it shows plainly where it has been 

 applied. It remains in suspension well and there is no difficulty in 

 applying it at uniform strength. 



Arsenate of lead is also handled in trade as a proprietary article 

 under the name of Disparene. In considerable quantities it can be 

 prepared more cheaply than it can be purchased, but in small lots 

 the ready-made material is the cheaper. 



The following formula may also be used : 



ARSENATE OF LEAD. (2.) 



Nitrate of lead 10 ounces. 



Arsenate of soda 5 ounces. 



Water 50 gallons. 



This is prepared in the same manner as preceding formula. 



