n 



fore my visit. In these injured trees the beetles 

 had multiplied, and they emerged the following 

 summer and made a deadly attack upon the sur- 

 rounding vigorous trees. Although this latter 

 attack was made only a month or two before 

 my arrival, the trees were already dead and 

 their needles had changed to a sickly greenish 

 yellow. Amid one of these clumps was a veteran 

 yellow pine that lightning had injured a few 

 years before. Beetles attacked and killed this 

 old pine about a year before I appeared upon 

 the scene. It was the only tree in this now dead 

 clump that was attacked on that first occasion ; 

 but some weeks before my visit the beetles in 

 multiplied numbers swarmed forth from it and 

 speedily killed the sound neighboring trees. 



These conclusions were gathered from the 

 condition of the trees themselves together with 

 a knowledge of beetle habits. Not a beetle could 

 be found in the lightning-injured pine, and its 

 needles were dry and yellow. The near-by dead 

 pines were full of beetles and their eggs; the 

 needles, of a greenish yellow, were slightly tough 

 and still contained a little sap. 



175 



