THE TREE DOCTOR 



41 



supposed, I call attention to Photo 30. This is at the little sta- 

 tion of Logansport, Pa., on the Allegheny Valley Railroad. The 

 tree that is so conspicuous is a Rock Maple. It has grown since 

 the railroad was built. Not only does this tree receive the 

 smoke day after day and year after year, but if you look farther 

 up the track you will notice a large Sycamore, hanging directly 

 over the main track ; and around the curve is another, a majestic 

 Elm ; and right up into the foliage of these over-hanging 

 branches the heavy locomotives vomit their scalding steam and 

 smothering smoke, and yet there is scarcely any difference in 

 the foliage of these parts of the trees. They are in a state of 

 perfect health because their root conditions are right. 



To show how a tree can be carried up and be out of the way 

 of passing vehicles, you can learn a lesson from Photo 31. The 



Photo 32 

 Planted Three Feet inside the Sidewalk. 



