342 Report’ or THE ENTOMOLOGISTS OF THE 
water clear, while the green arsenite remained in suspension for 
over two hours. 
It is because the green arsenite stays suspended in water so 
much longer than Paris green, that it is more valuable as an in- 
secticide. Without doubt much of the failure to get good results 
from Paris green is because of the difficulty of keeping it evenly 
distributed through the tank. Unless the mixture is almost con- — 
stantly agitated, the Paris green sinks to the bottom and is quickly 
drawn out by the pump, so that before the tank is half empty 
most of the poison is gone and the remainder of the water contains 
so little Paris green as to be hardly worth applying. 
HOW TO USE GREEN ARSENITE. 
Green arsenite should be used the same as Paris green. For 
ordinary purposes use 1 pound to from 100 to 150 gallons of 
water with the addition of enough freshly-slaked lime to make the 
mixture slightly “milky ” in appearance. Lime should always be 
added, for, in addition to other uses, it prevents injury to the 
foliage. It may be used with Bordeaux mixture in the same man- 
ner as Paris green. 
PRICE PER POUND AND WHERE OBTAINED. 
Green arsenite can be obtained from the Adler Color and Chem- 
ical Works, New York, and probably from other leading dealers 
in similar products for 15 cents per pound. 
EXPERIMENTS WITH GREEN ARSENITE. 
No strictly comparative experiments with this insecticide have 
been made here at the Station. Comparative tests’ by C. L. 
Marlatt, however, indicate that green arsenite and Paris green are 
equally effective as insecticides. 
Experiments with green arsenite made by the writer are re- 
corded on pages 600-601 of Bulletin 136 of this Station and on 

11 U. 8. Dept. Agr., Div. Ent., Bul. 6, n. ser.: 30-35. 
