INSECTICIDES. 433 



sprayed with Paris green, in the proportion of 4 lbs. to 150 

 gal. of water. Two died the second, three the fourth, two 

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



Check experiment : none dead. 



No. 73. —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 4 l])s. to 150 gal. of 

 water. Four died the second, four the third, one the fifth 

 and one the sixth day. 



Check experiment : none dead. 



No. 74. — 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 4 lbs. to 150 gal. of 

 water. Four died the third day ; two pupated the fourth 

 day ; three died the fifth and one the sixth day. 



Check experiment : one died the third day. 



No. 75. — July 10, 1894. Ten caterpillars, of the fifth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 4 lbs. to 150 gal. of 

 water. One died the second day, two pupated and two died 

 the third day ; two pupated and one died the sixth day ; one 

 died the seventh and one the eighth da3^ 



Check experiment : one pupated the fourth day ; one died 

 the sixth day. 



No. 76 (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, in the proportion 

 of 4 lbs. to 150 gal. of water. One died and two pupated 

 the fifth day ; one died the sixth and two the seventh day ; 

 tone pupated the fourteenth, one the fifteenth, one the nine- 

 teenth and one the twenty-second day. Foliage badly 

 burned. 



5 lbs. Paris Green to 150 gal. Water. 



No. 77. — April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with Paris green, in the proportion of 5 lbs. to 150 gal. of 

 water. Two died the first and seven the third day ; and one 

 escaped. 



Check experiment: none dead; one escaped. 



