INSECTICIDES. 439 



molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of | lb. each 

 to 150 gal. of water. Two died the first day; two pupated 

 the fifth day ; three died the ninth, two the tenth and one 

 the fourteenth day. 



Check experiment : one lost and one pupated the third 

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

 sixth day ; one died the eighth, three the twelfth and one 

 the thirteenth day. 



No. 16 (field experiment). — July 7, 1894. Ten cater- 

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

 which had been sprayed with Paris green and lime, in the 

 proportion of f lb. each to 150 gal. of water. Two died the 

 third day ; two pupated the sixth and one the thirteenth 

 day ; one died and one pupated the fourteenth day ; one 

 died and two pupated the eighteenth day. 



1 lb. Each Paris Oreen and Lime to 130 gal. Water. 



No. 17. — April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with Paris green and lime, in the proportion of 1 lb. each 

 to 150 gal. of water. Eight died the second, one the fourth 

 and one the fifth day. 



Check experiment : none dead ; five escaped. 



No. 18. — May 9, 1894. Ten caterpillars, six days old, 

 were placed on lettuce leaves which had been treated with 

 Paris green and lime, in the proportion of 1 lb. each to 150 

 gal. of water. One died the second, six the third, one the 

 fourth, one the fifth and one the sixth day. 



Check experiment : one died the second day. 



No. 19.— May 28, 1894. Ten caterpillars, of the first 

 molt, were placed on lettuce leaves which had been treated 

 with Paris green and lime, in the proportion of 1 lb. each to 

 150 gal. of water. One died the fourth, two the fifth, three 

 the sixth, two the eighth, one the ninth and one the tenth day. 



Check experiment : one died the sixth day. 



No. 20. — eTune 10, 1894. Ten caterpillars, of the second 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 1 lb. each 



