420 THE GYPSY MOTH. 



Three died the second, three the third, one the fourth and 

 one the fifth day, and two escaped. 



Check experiment : none dead. 



Xo. 3. — 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 ^ lb. to 150 gal, of 

 water. Two died the third, one the fourth, three the sixth, 

 two the seventh and two the eighth day. 



Check experiment : one died the third day. 



J^o. 4. — 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 ^ lb. to 150 gal. of 

 water. One died on the seventh, two the eighth, five the 

 nintli and two the tenth day. 



Check experiment : none dead. 



Xo, 5. — June 21, 1894. Ten caterpillars, of the third 

 molt, were placed on elm leaves w^iich had been sprayed 

 with Paris green, in the proportion of ^ lb. to 150 gal. of 

 water. One died the fourth, two the fifth, two the sixth, 

 two the seventh, one the eighth, one the ninth and one the 

 eleventh day. , 



Check experiment : none dead. 



]S'o. 6. — 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 ^ lb. to 150 gal. of 

 water. Three died the third, two the fourth, one the fifth, 

 one the sixth and three the seventh day. 



Check experiment : one died the fifth and one the sixth 

 day. 



No. 7 (field experiment). — June 28, 1893. A branch 

 of hop-hornbeam was si)rayed with Paris green, in the pro- 

 portion of ^ lb. to 150 gal. of water, and ten fourth-molt 

 caterpillars placed upon it. July 5, the foliage was so badly 

 burned that the caterpillars were removed to an unsprayed 

 branch. July 30, the food sui)ply having given out, they 

 were again removed to another unsprayed branch. Five 

 of these caterpillars died before pupating, and, of the five 

 that began to pupate, three emerged. Foliage very badly 

 burned. 



