LESSON 20 
STREET TREES — TECHNICAL STUDIES 
N this study the pupil should master the practical 
or technical details which are essential in order 
to enable him to manage street trees and get 
the best results. 
Materials 
The study should be conducted in the field 
upon street trees of the neighborhood. There are many books and 
bulletins dealing with the care of trees, pruning, spraying, so-called 
tree surgery, city forestry, etc. Some of these books are listed 
amongst the reference readings below. They should be studied 
as fully as time permits, but the first and most important step in 
the work is to become acquainted with the trees themselves and 
with the conditions under which they live. 
Study 
Each pupil should be assigned to a certain section planted with 
street trees. This should be the equivalent of not less than two 
city blocks nor more than one half mile. On this space he should 
gather all possible information, such as that suggested below: 
1. What is the character of the street under study — country 
road, village residence section, business street, or what? 
2. To what extent is the street traversed by electric car lines, 
electric service wires, telephone wires, gas mains, water mains, sewers, 
etc.? 
3. What is the character of the soil? 
4. What other conditions have any effect on the growth or 
health of trees? 
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