.58 



OUR SHADE TREES AND THEIR INSECT DEFOLIATORS. 



Moreover, whole rows of old Silver-leaved Poplars (Populus alba), more 

 than 1,500 in all, were cut down during the winter of 1887-88, and their 

 places filled by young Red Oaks, Sugar Maples, and Silver Maples. 

 Many of tbe Box Elders were also taken down, although these were in 

 the main young trees. A number of old tree boxes were removed, and 

 where the tree was large enough to stand up by itself and simply needed 

 protection from horses, a coarse wire screen was substituted for the 

 box with good effect. 



