218 POPULAR SCIENCE MONTHLY 



be applied not later than midsummer, that is, before the newly matured 

 beetles have begun the function of reproduction, and they must be 

 continued intact until frosts have killed the last of the beetles for 

 the year. They also must be renewed annually as long as the tree 

 stands. One might feel justified in employing such a remedy to 

 save a few favorite trees, but it involves too much labor to be of 

 practical value for general application. 



The foregoing statements, which are assumed to be indisputable, 

 show that the prevailing condition of the black locust tree in the land 

 of its origin warrants the conclusion that it is fated, not to extinction, 

 but to destruction as a profitable natural product; and that this fate is 

 beyond the effective reach of any known general remedy. The bio- 

 logical aspect of this subject is one of very great interest, but this 

 article has purposely been confined to a presentation of its economic 

 bearings, the significance of which is too obvious to need explanation. 



