INSECTICIDES. 425 



molt, were placed on lettuce leaves which had been treated 

 with Paris green, in the proportion of 1 lb. to 150 gal. of 

 water. Three died the third, one the fourth, one the fifth, 

 four the sixth and one the seventh day. 



Check experiment : one dead. 



No. 29. — June 10, 1894. Ten caterpillars, of the second 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 1 lb. to 150 gal. of 

 water. One died the second, one the third, two the fourth, 

 one the fifth, four the seventh and one the eighth day. 



Check experiment : none dead. 



No. 30.— June 21, 1894. Ten caterpillars, of the third 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 1 lb. to 150 gal. of 

 water. Two died the second, three the third, two the 

 fourth, one the sixth and two the seventh day. 



Check experiment : none dead. 



No. 31. — June 29, 1894. Ten caterpillars, of the fourth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 1 lb. to 150 gal. of 

 water. Four died the tliird, one the fourth, one the fifth, 

 two the sixth, one the seventh and one the eighth day. 



Check experiment : one died the fifth day ; one pupated 

 and one died the sixth day. 



No. 32 (field experiment). — June 26, 1893. A branch 

 of apple tree was sprayed with Paris green, in the propor- 

 tion of 1 11). to 150 gal. of water, and ten fourth-molt cater- 

 pillars placed upon it. Of these, four died without pupating, 

 and, of the six which began to pupate, none emerged. 

 Foliage slightly burned. 



No. 33 (field experiment) . — June 26, 1893. An apple- 

 tree branch was sprayed with Paris green, in the proportion 

 of 1 lb. to 150 gal. of water, and nine fourth-molt cater- 

 pillars placed upon it. July 16, the branch having been 

 broken off by the wind, the caterpillars were transferred to 

 another tree, and the branch sprayed. Five died before 

 pupating, and, of the four which pupated, two emerged. 

 Foliage badly burned. 



No. 34. — July 10, 1894. Ten caterpillars, of the fifth 



