468 



THE GYPSY MOTH. 



No. 110. —May 28, 1894. Ten caterpillars, of the first 

 roolt, were placed on lettuce leaves which had been treated 

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

 of water. Two died the third, one the fourth, two the fifth, 

 two the sixth and three the eighth day. 



Check experiment : one died the sixth day. 



No. 111. — June 10, 1894. Ten caterpillars, of the second 

 molt, were placed on elm leaves which had been sprayed 

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

 of water. One died the third, two the fourth, three the fifth, 

 three the sixth and one the eighth day. 



Check experiment : none dead. 



No. 112. — June 21, 1894. Ten caterpillars, of the third 

 molt, were placed on elm leaves which had been sprayed 

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

 of water. One died the second, three the third, two the 

 fourth, one the fifth, two the sixth and one the seventh day. 



Check experiment : none dead. 



No. 113. — June 29, 1894. Ten caterpillars, of the fourth 

 molt, were placed on elm leaves which had been sprayed 

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

 of water. Three died the second, two the third, three the 

 fourth and two the sixth day. 



Check experiment : one died and one pupated the second 

 day ; one died the third and one the fifth day. 



No. 114 (field experiment). — July 1, 1893. A branch 

 of a small oak tree was sprayed with arsenate of lead, in the 

 proportion of 6 lbs. to 150 gal. of water, and ten large fifth- 

 molt caterpillars placed upon it. All died within three 

 weeks from the time of spraying. Foliage uninjured. 



No. 115.— July 9, 1894. Ten caterpillars, of the fifth 

 molt, were placed on elm leaves which had been sprayed 

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

 of water. Two died and three pupated the fourth day ; 

 three died the seventh, one the ninth and one the tenth day. 



Check experiment : one died and two pupated the fourth 

 day ; one died the fifth day ; two pupated the sixth and one 

 the seventh and eighth days. 



No. 116 (field experiment).— July 9, 1894. Ten cater- 



