12 
A further experiment, this time tried for the purpose of testing the 
possibility of hastening the work of the parasite during favorable 
weather by large introductions, was carried out as follows: The sub- 
jects of the experiment were two fields of oats, each containing 4 
acres. In one of these it was determined to introduce enormous 
numbers of parasites artificially, keeping records of this field for 
comparison with the other field in which no introductions were made, 
Fic. 7.—Stalk of wheat, the leaves covered with dead ‘“ green bugs” killed by the parasite 
Lysiphlebus tritici. About natural size. (Original.) 
thus determining the measure of benefit, if any, which resulted from 
the artificial introduction. Mr. Ainslie was instructed by wire to ship 
from Wellington, Kans., 6 bushels of the wheat plants that had been 
destroyed by the * green bug” and which, in some cases, were literally 
covered with the parasitized bodies of the pest, upward of 500 having 
been found on a single plant. (See fig. 7.) Before taking up the ex- 
[Cir. 93] 
