478 



THE GYPSY MOTH. 



were able to complete the process of pupation and emerge. 

 Foliage in good condition. 



No. 4. — July 6, 1893. A branch was sprayed with the 

 same mixture and at the same time as in the preceding 

 experiment, and ten fourth-molt caterpillars placed upon it. 

 Only two of these began to pupate, and both died without 

 emerging. Foliage but slightly, if at all, burned. 



No. 5. — July 6, 1893. A branch of a small oak tree 

 was sprayed with the same mixture as in the preceding 

 experiment, and at about the same time. Ten fifth-molt 

 caterpillars, some of which were very large, were placed on 

 the branch. July 20, the branch was resprayed, on account 

 of rain. Only two of the caterpillars began to pupate, one 

 of which emerged. The remainder died on the twenty- 

 fourth day after the first spraying. The foliage was slightly 

 burned. 



No. 6. — July 7, 1893. A branch of oak was sprayed 

 with 1 lb. of London purple and 2 lbs. acetate of lead to 

 150 gal. of water, and ten fifth-molt caterpillars placed upon 

 it. Of these ten, only one began to pupate, and this one 

 died before completing the process. Foliage only slightly 

 burned. 



No. 7. — July 7, 1893. A branch of oak was sprayed 

 with London jiurple and acetate of lead, in the proportion 

 of 2 lbs. each to 150 gal. of water. The London purple 

 and acetate of lead were thoroughly mixed in a l^eaker, the 

 proper amount of glucose added, and, after being stirred, 

 the mixture was poured into the sprayer, the rest of the 

 water added and the whole mixed together. Ten fifth-molt 

 caterpillars, five large and five small, were then placed on 

 the branch. July 20, the branch was resprayed, on account 

 of rain. All of the caterpillars except one died before 

 beginning to pupate, and this one was not able to complete 

 the process. Foliage in good condition. 



~^o, 8. — July 8, 1893. An oak branch was sprayed 

 with London purple and acetate of lead, in the proportion 

 of 3 lbs. each to 150 gal. of water. A teaspoonfiil of glu- 

 cose was added, and the mixture thoroughly stirred. Ten 

 large fifth-molt caterpillars were placed on the branch. All 



