INSECTICIDES. 



431 



3 lbs. Paris Green to 150 gal. Water. 



No. 61. — April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

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

 water. Five died the second, four the third and one the 

 fifth day. 



Check experiment : none dead. 



No. 62. — May 9, 1894. Ten caterpillars, six days old, 

 were placed on lettuce leaves which had been treated with 

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

 Two died the second, one the third, three the fourth, one 

 the fifth and three the sixth day. 



Check experiment : none dead. 



No. 63. — May 28, 1894. Ten caterpillars, of the first 

 molt, were placed on lettuce leaves which had been treated 

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

 water. Eight died the third day, one the seventh and one 

 the eighth day. 



Check experiment : none dead. 



No. 64. — 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 3 lbs. to 150 gal. of 

 water. One died the second day, one the third, four the 

 fifth, three the seventh and one the ninth day. 



Check experiment : none dead. 



No. 65.— 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 3 lbs. to 150 gal. 

 of water. One died the second, two the third, two the 

 fourth, four the fifth and one the sixth day. 



Check experiment : none dead. 



No. 66. — 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 3 lbs. to 150 gal. of 

 water. Two died the first, one the second, three the third, 

 two the fourth and two the sixth day. 



Check experiment : none dead. 



No. 67. — July 10, 1894. Ten caterpillars, of the fifth 



