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 INCHES 
Silver, or white, maple 21. Hard, rock, or sugar, maple 13 
American white elm 19 Red oak 13 
Basswood Pe oe 17. Scarlet oak : 13 
Red, or swamp, maple . 16 White ash ‘ 12 
Yellow, or common, locust . 14 Hackberry. ea 20 
Fic. 97. An Excavation which is being filled with Soil for a Red-Oak Tree 
in the Harvard University Yard 
177 
