472 



THE GYPSY MOTH. 



No. 134. — May 9, 1894. Ten caterpillars, sLx: days old, 

 were placed on lettuce leaves which had been treated with 

 arsenate of lead, in the proportion of 10 lbs. to 150 gal. of 

 water. Three died the second, two the third, two the fourth 

 and three the fifth day. 



Check experiment : none dead. 



No. 135.— May 28, 1894. Ten caterpillars, of the first 

 molt, were placed on lettuce leaves which had been treated 

 with arsenate of lead, in the proportion of 10 lbs. to 150 gal. 

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

 fifth, one the sixth and two the seventh day. 



Check experiment : none dead. 



No. 136.— June 10, 1894. Ten caterpillars, of the 

 second molt, were placed on lettuce leaves which had been 

 sprayed with arsenate of lead, in the proportion of 10 lbs. to 

 150 gal. of water. Three died the second, one the third, 

 one the fourth, two the fifth, two the sixth and one the 

 seventh day. 



Check experiment : none dead. 



No. 137. — 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 10 lbs. to 150 gal. 

 of water. Three died the fourth, four the sixth and three 

 the seventh day. 



Check experiment : none dead. 



No. 138. — 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 10 lbs. to 150 gal. 

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

 fourth and one the fifth day. 



Check experiment : one pupated the second and one the 

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



No. 139.— 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 10 lbs. to 150 gal. 

 of water. Two died and one was lost the fifth day ; four 

 died the sixth and three the seventh day. 



Check experiment : one pupated the fourth, two the fifth, 

 one the sixth and one the seventh day. 



No. 140 (field experiment). — July 9, 1894. Ten cater- 



