INSECTICIDES. 435 



Check experiment : five pupated tlie fourth and one tlie 

 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 lbs. 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 lbs. 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 lbs. 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 lbs. 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 lbs. 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 lbs. 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 lbs. to 150 gal. of 

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

 and one the sixth day. 



Check experiment : none dead. 



