INSECTICIDES. 433 



sprayed with Paris green, in the proportion of 4 Ibs. 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 Ibs. 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 Ibs. 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 Ibs. 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 day. 



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 been sprayed with Paris green, in the proportion 

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

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

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

 teenth and one the twenty-second day. Foliage badly 

 burned. 



5 Ibs. 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 Ibs. to 150 gal. of 

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

 escaped. 



Check experiment : none dead ; one escaped. 



