INSECTICIDES. 435 



Check experiment : five pupated the fourth and one the 

 fifth day ; one died the eleventh day. 



No. 84 (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 5 Ibs. to 150 gal. of water. One pupated the fourth, 

 three the seventh, one the thirteenth, three the fourteenth, 

 one the seventeenth and one the twenty-first day. Foliage 

 badly burned. 



6 Ibs. Paris Green to 150 gal. Water. 



No. 85. April 26, 1894. Ten caterpillars, three days 

 old, were placed on lettuce leaves which had been treated 

 with Paris green, in the proportion of 6 Ibs. to 150 gal. of 

 water. One died the first, six the second and three the third 

 day. 



Check experiment : none dead ; one escaped. 



No. 86. May 9, 1894. Ten caterpillars, six days old, 

 were placed on lettuce leaves which had been treated with 

 Paris green, in the proportion of 6 Ibs. to 150 gal. of water. 

 Five died the second, one the third and four the fourth day. 



Check experiment : none dead. 



No. 87. 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 6 Ibs. to 150 gal. of 

 water. Four died the third, three the fourth, one the fifth, 

 one the seventh and one the eighth day. 



Check experiment : one died the fourth day. 



No. 88. 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 6 Ibs. to 150 gal. of 

 water. Four died the first, one the second, two the fourth, 

 one the fifth and one the sixth day ; one was lost. 



Check experiment : none dead. 



No. 89. 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 6 Ibs. to 150 gal. of 

 water. Five died the second, two the third, two the fifth 

 and one the sixth day. 



Check experiment : none dead. 



