THE TREE DOCTOR 



203 



Photo 188 

 The Canker-worm has Attacked the Tree. 



had been defoliated and covered with nests, as seen on the tree 

 in front of the horse, in Photo 187, and thousands of trees were 

 standing dead, killed by the repeated attacks of this foe. It is 

 spreading rapidly also in Pennsylvania, New Jersey, New York 

 and all the eastern states that I have visited. The work of the 

 canker worm is seen in Photo 188. In May and June, 1905, at 

 Sewickley, Pa., they destroyed the foliage of trees in miles of 

 woodlands. These "judgments" are befalling us as punishments 

 for our ignorance in destroying the native birds. This matter 

 is discussed in full in "A New Era in Tree Growing," showing 

 what must be done to remedy the trouble. 



A LUMBER FAMINE. 



Some two years ago an eminent French authority gave the 

 reason for the approach of a "lumber famine" for the whole 

 world. The substance of his reasons were about as follows : 



