ON TREES AND BIRDS. 



121 



the trees are diseased, therefore they are attacked 

 by boring insects, and, because there are not birds 

 enough, therefore the insects are killing the trees. 



This photograph shows you a loathsome " scale " in- 

 sect that is doing a great damage to the trees in the 

 cities. The name is a jaw-breaker, " Pulvarina In- 

 numerabillis" 



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