30 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos. 

 Eggs apparently alive, . 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos. 

 Eggs apparently aUve, 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos. 

 Eggs apparently aUve, . 



Total, 



Cluster 2. 

 -^ [ =10.16 per cent., or about 10 per cent. 

 115 =89.84 per cent., or about 90 per cent. 



128 eggs. 



Cluster S. 



. \ = 7.14 per cent., or about 7 per cent. 

 91 =92.86 per cent., or about 93 per cent. 



98 eggs. 



Cluster ^. 

 ,„ > =28.24 per cent., or about 28 per cent. 

 61 =71.76 per cent., or about 72 per cent. 



85 eggs. 



Cluster 5. 



- \ = 2.96 per cent., or about 3 per cent. 

 164 =97.04 per cent., or about 97 per cent. 



169 eggs. 



The average of these 5 clusters gives the following result: 



Dead eggs. 



Eggs apparently alive, . 



Total, 



11 = 9.17 per cent., or about 9 per cent. 

 109 =90.83 per cent., or about 91 per cent. 



120 eggs. 



Since this place, weakened by the wilt, contained only 109 eggs with 

 apparently living embryos to the cluster, almost 4 clusters were neces- 

 sary to equal the size of a normal cluster. The number of fresh egg 

 clusters, which were estimated at 60, thus must be reduced to about 

 20 clusters. The number of apparently living eggs was therefore de- 

 creased, as the result of Flacherie, to about 10 per cent. 



The second place which was selected in "West Boxford for experi- 

 ments with the disease consists of an isolated wood of about half an 

 acre. Most of the trees are oaks about thirty years of age, mixed 

 with underbrush. This locality is situated on Highland Street, between 

 two apple orchards. In the summer of 1909 the gypsy moth cater- 

 pillars were relatively more numerous than at the first place. No dis- 



