386 Report oF THE ENTOMOLOGISTS OF THE 
Plat I consisted of about 100 trees. Paris green was applied 3 
times at the strength of 1 pound to 150 gallons of lime water. “The 
first application was made as soon as the young caterpillars ap- 
peared, which was about May 6. The second application was made 
a week later and the third about 4 days from that time. 
Plat IT consisted of 14 trees and was sprayed with green arsenite, 
1 pound to 150 gallons of lime water. The first application was 
made May 18, the second May 22 and the third June 1. 
Plat III consisted of 3 badly infested trees and was left 
untouched asa check. The lime was not measured in any of the 
experiments, but enough freshly slaked lime was used to make 
the mixtures slightly milky in appearance. _ 
Results.— No very decided results were noticeable on either plat 
until after the second application, except in the case of the smaller 
caterpillars, those about one-fourth of an inch long, which suc- 
cumbed readily. Four days after the second application but very 
few live caterpillars could be found. The results were practically 
the same on the two plats. Probably the third application was 
hardly necessary. On Plat III the trees were nearly stripped of 
their foliage by June 1. 
Experiments in 1898.— This year the orchard was not as badly 
infested as in 1897. As in the year previous the worst infested 
trees were selected and divided into plats. 
Plat I, consisting of about 40 trees, had two applications of 
green arsenite at the same strength as in 1897. The caterpillars 
did not appear as early as the year previous, and hence the first 
application was not made until about the middle of May and the 
second about a week later. 
Plat II was sprayed 3 times with arsenite of lime made 
after the Kedzie formula.” The first application was made May 
27, the second May 31, and the third June 10. Plat III con- 
sisted of 2 trees, which were left unsprayed as a check. 

17 See note at the foot of page 388. 
