38 



Most of the caterpillars of this locality were at this time about half 

 way between the third and fourth molts. 



The place was visited again Aug. 30, 1910, with the local superin- 

 tendent of Haverhill, to see how the wilt had operated, and how many 

 fresh egg clusters were present. First it was noticed that the infested 

 portion of the forest was not uniformly infected with Flacherie. While 

 the periphery of the infested area (about 8 to 9 acres) showed a very 

 considerable decrease of the egg clusters in comparison with those of 

 the spring of 1910, the real center of the colony, which covered 3 to 

 4 acres, had been more resistant to the disease, although here also 

 the number of the fresh clusters had decreased considerably in com- 

 parison with the clusters of the previous year. Altogether the num- 

 ber of fresh clusters of the whole colony was estimated by us to be 

 about 3,500. The 5 clusters which served for examination proved to 

 be as follows: 



Cluster 1. 



8 1 

 28 > =28.57 per cent., or about 28.5 per cent. 



90 =71.43 per cent., or about 71.5 per cent. 



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 alive, . 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, 



. 126 eggs. 



Cluster 2. 



K > = 3.31 per cent., or about 3 per cent. 

 . 146 =96.69 per cent., or about 97 per cent. 



. 151 eggs. 



Cluster 3. 



4\ 

 ^3 f = 5.63 per cent., or about 5.5 per cent. 



. 285 =94.37 per cent., or about 94.5 per cent. 

 . 302 eggs. 



Cluster 4. 

 25 f = 12.36 per cent., or about 12 per cent. 



) 



. 227 = 87.64 per cent., or about 88 per cent. 

 . 259 eggs. 



Cluster 5. 



Q \ = 1.95 per cent., or about 2 per cent. 

 . 302 =98.05 per cent., or about 98 per cent. 



. 308 eggs. 



