490 



THE GYPSY MOTH. 



lb. of each to 150 gal. of water. The branch was sprayed 

 twice, on account of rain. The foliage was very badly 

 burned. 



No. 3. — July 12, 1893. A branch of apple tree was 

 sprayed with the same mixture, and by July 30 the foliage 

 was very badly burned. 



No. 4. — July 12, 1893. In order to get as near as 

 possible the exact effects of lime on the foliage, the two fol- 

 lowing experiments were used as checks on those preceding. 

 They were sprayed within an hour of each other, and all 

 conditions were as nearly the same as it was possible to 

 have them. In this experiment a branch of hop-hornbeam 

 was used as a check to No. 1. The branch was resprayed, 

 on account of rain. July 30, the foliage was burned worse 

 than that of experiment No. 1, even though the branch in 

 the latter had been sprayed three times. 



No. 5. — July 12, 1893. An apple-tree branch was used 

 as a check to experiment No. 2. The branch was resprayed, 

 on account of rain, and August 6 the foliage, though some- 

 what burned, was not as much so as in experiment No. 2. 



No. 6. — Ji^ly 12, 1893. An apple-tree branch was 

 sprayed with Paris green, in the proportion of 1 lb. to 150 

 gal. of water, the mixture having been allowed to stand for 

 nearly three hours. August 6 the foliage was very badly 

 burned. 



No. 7. — July 13, 1893. A branch of hop-hornbeam was 

 sprayed with Paris green and lime, in the proportion of 1 

 lb. each to 100 gal. of water. The branch was resprayed 

 twice, on account of rain. July 27, the foliage was very 

 badly burned. 



No. 8. — July 12, 1893. A branch of apple tree was 

 sprayed with arsenic, in the proportion of 1 lb. to 25 gal. 

 of water. July 19, the branch was resprayed, on account 

 of rain, and again on the 25th. August 6, the foliage was 

 badly burned. 



No. 9. — July 20, 1893. A branch of apple tree was 

 sprayed with arsenate of zinc, in the proportion of 1 lb. to 

 50 gal. of water. August 6, the foliage was badly burned. 



No. 10. — July 1, 1893. A small hop-hornbeam branch 



