INSECTICIDES. 431 



3 Ibs. 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 Ibs. 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 Ibs. 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 Ibs. 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 Ibs. 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 Ibs. 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 Ibs. 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 



