STREET TREES. 103 
required cach season for a number of years to develop good 
tops, while if they had well formed tops in the nursery and were 
Figure 21. Elm street 
tree properly trimmed 
for planting out. 
shortened back at planting time much less 
attention will be necessary. 
In a row of Elms or other trees there 
will often be found peculiar individual 
shapes. Some of the trees will take 
on desirable forms, while others will be 
spreading and awkward, and perhaps have 
a tendency to crack in the branches. In 
some cases a little extra pruning will bring 
such unfortunates into shape, but often they 
are incorrigible, and are best replaced by 
other trees with better forms. 
Protection should always be given street 
trees as soon as they are set out, and this 
should consist of something that will pro- 
tect them from sun-scald, gnawing of horses 
and whittling by thoughtless boys. A good 
temporary cover is afforded by wrapping 
the trunk with gunny sacking or similar 
material, but a more desirable protection is 
afforded by a slatted wooden frame or box 
for each tree, 
