470 



THE GYPSY MOTH. 



with arsenate of lead, in the proportion of 7 lbs. to 150 gal. 

 of water. One died the first, one the second, five the fourth 

 and three the fifth day. 



Check experiment : two pupated the second and three the 

 third day ; two died the fifth day. 



No. 123.— 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 7 lbs. to 150 gal. 

 of water. One pupated the third day ; three died and one 

 pupated the fifth day ; one died the seventh, one the eighth, 

 two the ninth and one the twelfth day. 



Check experiment : two pupated the fifth day ; one died 

 the seventh, ninth and tenth days. 



No. 124. —July 9, 1894. Ten caterpillars, of the fifth 

 molt, were placed on willow branches which had been 

 sprayed with arsenate of lead, in the proportion of 7 lbs. to 

 150 gal. of water. One pupated the second day ; one died 

 the third, one the fifth, one the sixth, one the eighth and 

 one the tenth day ; one died and one pupated the eleventh 

 day ; one pupated the sixteenth and one the thirty-first day. 



8 lbs. Arsenate of Lead to 150 gal. Water. 



No. 125. — March 7, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with arsenate of lead, in the proportion of 8 lbs. to 150 gal. 

 of water. Three died the second, four the third and three 

 the fifth day. 



No. 126. — May 9, 1894. Ten caterpillars, six days old, 

 were placed on lettuce leaves which had been treated with 

 arsenate of lead, in the proportion of 8 lbs. to 150 gal. of 

 water. Two died the third, three the fourth, four the fifth 

 and one the sixth day. 



Check experiment : none dead. 



No. 127.— 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 8 lbs. to 150 gal. 

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

 three the sixth and one the seventh day. 



Check experiment : none dead. 



No. 128. —June 10, 1894. Ten caterpillars, of the 



