47 



Log of Douglas spruce, showing galleries of the Douglas spruce Dendroctonus. 

 State of Washington. 



Storm-felled Douglas spruce offering favorable conditions for the propagation of 

 the Douglas spruce Dendroctonus and other bark-beetles. State of Washington. 



Bark from storm-felled log of Douglas spruce, showing galleries of the Douglas 

 spruce Dendroctonous. State of Washington. 



Group of long-leafed pine killed by so-called ' ' worm deadening. ' ' Eastern Texas. 



Young Sitka spruce, showing top killed by western spruce-weevil. State of 

 Washington. 



Cottonwood tree killed by the bronzed Agrilus, showing the galleries of larvae in 

 trunk. Priest Eiver Forest Eeserve, Idaho. 



Young chestnut killed by the two-lined chestnut borer. Western North Carolina. 



Large chestnut, the death of which was hastened by insect injury. Western 

 North Carolina. 



Girdled cypress tree injured by timber beetles. South Carolina. 



Trunk of hickory killed by hickory bark-beetle, showing galleries on surface of 

 wood. Western North Carolina. 



