INSECTICIDES. 441 



No. 26. 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 1 Ibs. each to 

 150 gal. of water. Four died the second, five the third and 

 one the fourth day. 



Check experiment : one died the second day. 



No. 27. May 28, 1894. Ten caterpillars, of the first 

 molt, were placed on lettuce leaves which had been treated 

 with Paris green and lime, in the proportion of 1 Ibs. each 

 to 150 gal. of water. Four died the third, one the fourth, 

 two the fifth and three the sixth day. 



Check experiment : one died the fifth day. 



No. 28. June 10, 1894. Ten caterpillars, of the second 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 1 Ibs. each 

 to 150 gal. of water. One died the second, one the fourth, 

 four the sixth, three the seventh and one the eighth day. 



Check experiment : none dead. 



No. 29. June 21, 1894. Ten caterpillars, of the third 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green and lime, in the proportion of 1J Ibs. each 

 to 150 gal. of water. Three died the third, one the fourth, 

 four the fifth and two the sixth day. 



Check experiment : none dead. 



No. 30. 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 1J Ibs. each 

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

 two the fifth and two the sixth day. 



Check experiment : one pupated the fourth day. 



No. 31. 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 1J Ibs. each 

 to 150 gal. of water. Two pupated the third and one the 

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

 died the eighth, two the ninth and one the eleventh day. 



Check experiment : one died the third day ; one pupated 

 the fourth, two the fifth, one the eighth and one the tenth 

 day. 



