36 



of fresh clusters, which were estimated at about 150. Mr. Swett later 

 made an examination and confirmed these facts. There is no sufficient 

 explanation so far for the peculiar behavior of the wilt in this locality. 

 Apparently the wind here played a special role. The difference in the 

 vegetation may also have had some influence. Does the eating of birch 

 foliage hasten the production of the disposition to Flacherie among 

 the caterpillars? 



The accompanying map will complete the description of the West 

 Bedford locality (Fig. 3). 



The microscopic examination of the 5 first egg clusters, found on 

 the oaks, gave the following result : 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 apparently alive, . 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, 



5 



181 



Cluster 1. 



| = 2.69 per cent., or about 2.5 per cent. 

 = 97.31 per cent., or about 97.5 per cent. 



186 eggs. 



Cluster 2. 



2\ 



7 > = 2.67 per cent., or about 2.5 per cent. 



328 =97.33 per cent., or about 97.5 per cent. 

 337 eggs. 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, 



Cluster 8. 



^ ? = 3.25 per cent., or about 3 per cent. 

 149 =96.75 per cent., or about 97 per cent. 



154 eggs. 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, 



Cluster 4. 



12) 



gg > =20.65 per cent., or about 20.5 per cent. 



269 =79.35 per cent., or about 79.5 per cent. 

 339 eggs. 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Cluster 5. 



3.19 per cent., or about 3 per cent. 

 303 =96.81 per cent., or about 97 per cent. 



Total, .... 313 eggs. 



