228 
in cage No. 1 were liberated in cage No. 3 and the last moths reared in 
cage No. 2 were liberated in cage No. 4, to rear the first and the last 
individuals of the second generation; and the moths reared in cage No. 
3 were liberated in cage No. 5, to rear the third generation. In this way 
it was possible to ascertain approximately the dates when each genera- 
tion began and ended. 
Fic. 5. Large screen-cage in course of construction. 
LIFE-HISTORY SERIES 
In the life-history series, pairs of adults of each of the broods were 
enclosed in oviposition cages (Fig. 4), and the number of eggs laid daily 
by each female and the dates of the death of the adults were noted. 
The eggs obtained were numbered and allowed to remain on the 
trees until the black spot appeared. They were then removed to small 
vials on the bits of leaf or bark on which they had been laid, and, as 
they hatched, the larve were transferred to apples with a camel-hair 
brush, some to apples on the trees and others to picked fruit. The apples 
were tagged and each was given a number corresponding to that of the 
egg, and when they showed conspicuous signs of worminess they were 
transferred to jars, in which were placed strips of corrugated strawboard 
or small pupal cages in which the larve might spin up. The dates were 
noted when the larve left the apple, when Eo pupated, and when the 
adults emerged. ‘ 
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