treated with London purple—if anything, a little less severely 
injured. There was also a barely perceptible difference in favor 
of the weaker mixture. Supposing that all the worst-injured 
leaves were rendered practically useless to the tree, the loss of 
foliage would probably amount to 4 or 5 per cent. 
There can certainly be no further question of the liability of 
the curculio to poisoning by very moderate amounts of either 
London purple or Paris green while feeding on the leaves and 
fruit of peach or plum, but much additional experiment is 
needed to test the possibility of preventing serious injury to 
these fruits by this means. The pupal hibernation and late 
appearance of a considerable percentage of the curculios make 
it possible that spraying must be several times repeated, and 
perhaps carried further into the season than is consistent with 
safety; and the limit of tolerance of these poisons by the peach 
under ordinarily trying circumstances has not been clearly as¬ 
certained. Further, the observations above reported on the 
food plants of the curculio make it likely that, in nature, a 
smaller proportion of the food of these beetles comes from the 
peach or plum than has hitherto seemed probable, and that 
poisons there applied would kill less certainly. It seems worth 
while to make the attempt to attract the adult to flowering 
plants in the orchard other than the peach, with the hope of 
poisoning it there (especially late in the season), without using 
these dangerous insecticides on fruits afterwards to be eaten. 
