Hark borer work at Bath-on-the-Hudson 



1 Two white pines taken September 22, 1901 



2 Same, photographed April 1902. These two illustrate the rapidity with 



which trees may be killed by bark borers. T o m icus call i- 

 graphus Germ, and T. pini Say were responsible for most of 

 the injury. 



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