432 



THE GYPSY MOTH. 



molt, were placed on elm leaves which had been sprayed 

 with Paris green in the proportion of 3 lbs. to 150 gal. of 

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

 pupated the fourth and one the fifth day ; one pupated and 

 one died the sixth day ; one died the seventh, two the ninth 

 and one the fourteenth day. 



Check experiment : three pupated the fourth day, one 

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

 died the ninth day ; three died the fourteenth day. 



No. 68 (field experiment). — July 7, 1894. Ten cater- 

 pillars, of the fifth molt, were placed on willow branches 

 which had been sprayed with Paris green, in the proportion 

 of 3 lbs. to 150 gal. of water. One died the third, one 

 the fourth and one the fifth day ; one pupated the sixth, one 

 the fifteenth, one the eighteenth, one the twenty-first, one the 

 twenty-fourth, one the twenty-eighth and one the thirty- 

 first dav. Foliao^e badlv burned. 



4 lbs. Paris Green to 150 gal. Water. 



Xo. 69. — April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with Paris green, in the proportion of 4 lbs. to 150 gal. of 

 water. Five died the second and four the third day ; and 

 one escaped. 



Check experiment : none dead. 



No. 70. — May 9, 1894. Ten caterpillars, six days old, 

 were placed on lettuce leaves which had been treated with 

 Paris green, in the proportion of 4 lbs. to 150 gal. of water. 

 Two died the second, five the third, one the fourth and one 

 the fifth day ; and one escaped. 



Check experiment : two died the fourth day. 



No. 71. — May 28, 1895. Ten caterpillars, of the first 

 molt, were placed on lettuce leaves which had been treated 

 with Paris green, in the proportion of 4 lbs. to 150 gal. of 

 water. One died the fourth, two the fifth and seven the 

 sixth day. 



Check experiment : one died the fifth day. 

 No. 72.— June 10, 1894. Ten caterpillars, of the 

 second molt, were placed on elm leaves which had been 



