102 ELEMENTARY FORESTRY. 
from drying out, and this is especially beneficial if the trees are 
artificially watered. 
Watering should be done thoroughly or not at all. One 
good watering should keep the ground moist for two or three 
weeks, in the driest weather we have, if the land is heavily 
mulched when the water is applied. For a good watering in a 
dry time about one barrel of water should be given to each street 
or lawn tree. A hollow should be made around the tree and 
covered with mulch before the water is applied. This same 
amount of water might be applied at the rate of one or two pail- 
fuls a day, and not be of the least benefit to the tree, if applied to 
the bare surface of the ground. 
Figure 18. Soft Maple Figure 19. Soft Maple Figure 20. Soft Maple 
not pruned since it was once pruned showing several times pruned 
planted out. Liable to close head that is not preserving a main cen- 
break in its crotches at liable to break down. A tralaxis. A good form. 
any time. A bad form. good form. 
The Pruning of Street Trees at the time they are set 
out is an important matter. If the trees are very tall and slen- 
der, it is a good plan to cut them off at about ten feet from the 
ground, and trim off all side branches, ag shown in figure 21. 
For trees that have been pulled from the woods this is generally 
the best treatment, while for nursery-grown trees that have had 
plenty of room to develop a good top it may sometimes be best 
to trim so as to leave part of the top. If the trees are trimmed 
to bare poles before planting, some little pruning will be 
