INSECTICIDES. 443 



Check experiment : tAvo lo.st the seventh day. 



No. 38.— June 29, 1894. Ten caterpillars, of the fourth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 2 lbs. each 

 to 150 gal. of water. Two died the second, two the third, 

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

 eighth day. 



Check experiment : one died the fourth, one the fifth and 

 one the sixth day. 



No. 39.— July 11, 1894. Ten caterpillars, of the fifth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 2 lbs. each to 

 150 gal. of AYater. Two pupated the second day; one died 

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

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

 and two the tenth day. 



Check experiment : one died the third day ; two died and 

 two pupated the ninth day. 



No. 40 (field experiment). — July 7, 1894. Ten cater- 

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

 which had l)een sprayed with Paris green and lime, in the 

 proportion of 2 lbs. each to 150 gal. of water. One pupated 

 the sixth day ; two died the seventh day ; one pupated the 

 eighth day ; one died and one pupated the thirteenth day ; 

 one pupated the fourteenth, one the sixteenth, one the 

 twentieth and one the twenty-second day. 



3 lbs. Each Paris Green a7j,d Lime to 150 gal. Water. 



No. 41. — 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 3 lbs. each 

 to 150 gal. of water. Four died the second, two the third, 

 one the fourth and three the fifth day. 



Check experiment : none dead. 



No. 42. — 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 3 lbs. each to 150 

 gal. of water. Two died the second, three the third, one 

 the fourth and four the fifth day. 



