28 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, . . .. 



Cluster 2. 



2 \ 



> =17.17 per cent., or about 17 per cent. 



193 =82.83 per cent., or about 83 per cent. 

 233 eggs. 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Clyster 8. 



= 7.38 per cent., or about 7 per cent. 



Total, 



9 

 113 =92.62 per cent., or about 93 per cent. 



122 eggs. 



Cluster 4. 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . . 292 =95.11 per cent., or about 95 per cent. 



14 > = 4.89 per cent., or about 5 per cent. 



Total, 



Unfertilized eggs, . 

 Eggs with dead embryos, 

 Eggs apparently alive, . 



Total, . . ..... 



307 eggs. 



Cluster 5. 



2 1 



9 > = 2.95 per cent., or about 3 per cent. 



362 =97.05 per cent., or about 97 per cent. 

 373 eggs. 



Averaging these 5 clusters we get : 



Dead eggs, . . . 

 Eggs apparently alive, . 



Total, . . 



17 = 6.42 per cent., or about 6.5 per cent. 

 248 =93.58 per cent., or about 93.5 per cent. 



265 eggs. 



Since this place, after infection with Flacherie, contains on the 

 average only 248 eggs with apparently living embryos per cluster, 

 almost 2 clusters of this locality are necessary to equal a normal 

 cluster. The number of the fresh clusters, estimated at about 400, thus 

 has to be reduced to about 250. The number of apparently living eggs 

 in this locality therefore decreased, after the wilt had operated, to 

 about 42 per cent. 1 



1 This forest was cut down by the owner in the beginning of the winter of 1910-11, and all egg 

 clusters which the forest contained were collected by the local superintendent; 444 clusters were 

 found. Our estimate of the clusters in the autumn, which was 400, therefore was nearly correct. 

 The number of apparently living eggs which remained after Flacherie did its work has to be in- 

 creased 3 per cent., that is to say, to 45 per cent. 



