25 2 



THE FORESTER. 



October, 



bark regions of the eastern and north- 

 eastern United States. At one tannery 

 where the stored bark was examined by 

 the writer some $50,000 worth of hem- 

 lock bark was infested. In one stack of 

 over 2,000 cords the inner part of the bark 

 was largely converted into powder. 



Many other examples of the destructive 

 ravages of insect enemies of forests and 

 forest products could be mentioned, which 



methods of preventing losses, suggested 

 by a knowledge of the habits of the 

 insects, the peculiar character of their 

 work, and the conditions favorable and un- 

 favorable for their depredations, we may 

 mention the following: investigations of 

 the tan bark insects revealed the fact that 

 they do not attack the bark until it is two 

 or three years old. Thus if tanners and 

 dealers see to it that no bark is allowed 



" 1 1 '""'wmmml^U 



"*' 



I I 



WORK OF CHESTNUT TIMBER WORM. INFESTS WOOD 

 OF EIVING, INJURED, AND DEAD 

 TREES AND EOGS. 



WOOD BORER. LARViE BORE THROUGH 



THE OUTER SAP-WOOD JUST BENEATH 



SURFACE AND DIRECTLY ACROSS 



GRAIN. HASTENS DEATH OF 



TREE AND DECAY 



OF WOOD. 



have been observed and studied by the 

 writer, but these should be sufficient to 

 indicate the magnitude of this feature of 

 the forest problem. 



As examples of some of the simple 



to remain in the stacks or stored in sheds 

 for more than three years from the time it 

 is taken from the trees, all trouble from 

 this source would be prevented. 



The facts determined from an investi- 



