CHAPTER XIX 



SHADE TREES 



Under favorable conditions the following trees, if 

 planted when they are three inches in diameter, will 

 make the indicated growth in twenty years : 



INCHES 



Silver, or white, maple . . 21 



American white elm ... 19 



Basswood 17 



Red, or swamp, maple . . . 10 



Yellow, or common, locust . 14 



INCHES 



Hard, rock, or sugar, maple . 13 



Red oak 13 



Scarlet oak 13 



White ash 12 



Ilackberry 10 



FIG. 97. An Excavation which is being filled with Soil for a Red-Oak Tree 



in the Harvard University Yard 



177 



