488 THE GYPSY MOTH. 



Experiment No. 9. Two twigs of wild cherry were 

 trimmed so that only six leaves remained on each. One of 

 these twigs was sprayed with Paris green, in the proportion 

 of 3 Ibs. to 150 gal. of water, and the other was left un- 

 sprayed. Ten full-grown caterpillars were placed upon 

 the twigs, which were then enclosed in a sack. July 15. 

 None of the leaves were eaten. July 16. Very little was 

 eaten from the unpoisoned leaves and a larger amount from 

 the poisoned leaves. July 17. The result was the same. 

 July 18. Ten times as much had been eaten from the 

 poisoned as from the unpoisoned leaves. July 19. Nearly 

 all of the leaves upon the poisoned twig had been eaten, 

 and but a small portion on the unpoisoned. Three of the 

 caterpillars died. 



Experiment No. 10. A twig of apple, bearing five 

 leaves, was thoroughly sprayed with Paris green and lime 

 in water, in the proportion of 3 Ibs. of Paris green and 5 

 Ibs. of lime to 150 gal. of water, and a similar twig was left 

 unsprayed. Ten full-grown caterpillars were sacked in 

 upon the two twigs. The first day the larger part of the 

 feeding was upon the poisoned leaves ; on the succeeding 

 day nearly all of the poisoned and about half of the un- 

 poisoned leaves were eaten. 



Experiment No. 11. Alternate leaves of a twig of wild 

 cherry were painted with Paris green and lime, in the pro- 

 portion of 3 Ibs. of Paris green and 5 Ibs. of lime to 150 gal. 

 of water, in such a manner as to cover the entire surface of 

 the leaves. Ten fourth-molt caterpillars were then sacked 

 in upon the twig. The feeding was nearly equal upon the 

 poisoned and unpoisoned leaves. 



Experiment No. 12. A twig of apple was prepared in 

 the same way, using arsenate of lead, in the proportion of 3 

 Ibs. to 150 gal. of water, and ten fifth-molt caterpillars were 

 sacked in upon it. Nearly all of the feeding was upon the 

 poisoned leaves. 



Experiment No. 13. A twig of wild cherry was sprayed 

 with arsenate of lead, in the proportion of 6 Ibs. to 150 gal. 

 of water, and a similar twig on the same branch left 

 unsprayed. Ten caterpillars of the fifth molt were sacked 



