428 THE GYPSY MOTH. 



molt, were placed on elin leaves which had been sprayed 

 with Paris green, in the proportion of 1 Ibs. to 150 gal. 

 of water. Two died the third, two the fourth, three the 

 fifth, one the sixth and two the seventh day. 



Check experiment : none dead. 



No. 45. June 29, 1895. Ten caterpillars, of the fourth 

 molt, were placed on elm leaves which had been sprayed 

 with Paris green, in the proportion of 1 Ibs. to 150 gal. 

 of water. Two died the second, four the third, three the 

 fourth and one the fifth da}'. 



Check experiment : one died the fourth day. 



No. 46 (field experiment). June 6, 1893. An apple- 

 tree branch was sprayed with Paris green, in the proportion 

 of 1 Ibs. to 150 gal. of water, and eight fourth-molt cater- 

 pillars placed upon it. Six caterpillars in this experiment 

 died gradually, one lived over ten weeks on the foliage and 

 pupated. Another lived on the foliage a month, then pu- 

 pated and finally emerged. Foliage somewhat burned. 



No. 47 (field experiment). June 26, 1893. An apple- 

 tree branch was sprayed with Paris green, in the proportion 

 of 1J Ibs. to 150 gal. of water, and ten fourth-molt cater- 

 pillars placed upon it. Of these, all but one died before 

 beginning to pupate, and that one was not able to complete 

 the process. It took more than a week for the poison to 

 begin to act, and the last caterpillar lived over six weeks. 

 The foliage was badly burned. 



No. 48. 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 1|- Ibs. to 150 gal. of 

 water. Two died and one pupated the third day ; one died 

 the fourth, two the sixth, three the eighth and one the 

 twelfth day. 



Check experiment : one died the second day ; one pupated 

 the fourth, one the fifth, one the sixth and one the seventh 

 day. 



No. 49 (field experiment). July 7, 1894. Ten cater-' 

 pillars, of the fifth molt, were placed on a willow branch 

 which had been sprayed with Paris green, in the proportion 

 of 1| Ibs. to 150 gal. of water. One died and one pupated 



