47 



Cluster 1. 

 Unfertilized eggs, . 3 \ „ , _ , 



Eggs with dead embryos, . 8 / = ^'^^ P®"" '*^*' """ *''°^* ^ P^"" •'^'^*- 

 Eggs apparently alive, . 109 =90.83 per cent., or about 91 per cent. 



Total, . 120 eggs. 



Cluster S. ' 

 Unfertilized eggs, . . 38 1 



Eggs with dead embryos, 116 / =^'^-^^ P^ ''^'^*-' °' *^°"* ^^'^ P^"^ '=«''*• 



Eggs apparently alive, 22 = 12.50 per cent., or about 12.5 per cent. 



Total, . 176 eggs. 



The average of these 2 clusters gives the following : — 



Dead eggs, 83 =55.70 per cent., or about 55.5 per cent. 



Eggs apparently alive, . 66 =44.30 per cent., or about 44.5 per cent. 



Total, 149 eggs. 



Since this place, in which Flacherie had operated, contained only 

 66 eggs with apparently living embryos on the average per cluster, 

 the size of these clusters was about five-sixths less than normal. The 

 number of fresh clusters, which were found to be 2, thus equal together 

 only one-third of a normal oue. The number of apparently living 

 eggs of this locality therefore had decreased, after the wilt had worked, 

 to about 3 per cent. 



Cohasset, Mass. 



Division Agent, F. A. Bates; Load Superintendent, J. E. Gkassie. 



An island, known as Barron's Island, which is situated southeast of 

 Cohasset in the headpart of Bailey's Creek, was selected for the ex- 

 periment. This island has an area of about 10 acres, and is densely 

 overgrown, mostly with oaks about twenty-five years of age and with 

 underbrush. The gypsy moth was quite numerous here in 1909, but 

 there was no disease among the caterpillais, according to Mr. Grassie's 

 statement. Our joint estimate of the clusters which were present in 

 the spring of 1910 was about 2,000. No artificial means of destroying 

 the gypsy moth had been undertaken here. 



Mr. Grassie, who was intrusted with the breeding of the caterpillars, 

 noticed the wilt in this brood after a feeding of about sixteen days. 

 On June 27, 1910, the caterpillars were inspected, and there were found 



1 Without the protecting cover. 



