PRACTICAL ARBORICULTURE 67 
the sun scalds the bark, when borers get a hold and destroy the trees. If trees 
must be pruned high, as for street planting, the trunk should be wrapped or 
a box provided which will shade the trunk from the sun. The European 
linden is superior to our American variety. 
THE SYCAMORE OR PLANE TREE. 
The Oriental plane is far superior to our common sycamore. It is hardy 
at Denver, and doubtless will be so found at Colorado Springs. An avenue 
of Oriental plane is a very beautiful object. 
By the way, if some agreement could be had by property owners by 
which each street should be planted with one special tree placed at distance 
of, say, thirty feet between the temporary cottonwood, soft maple, etc., the 
final result would be most satisfactory in-enhancing the attractiveness of this 
tourist city. 
MULBERRY. 
There are several varieties of mulberry which thrive here; they have 
handsome foliage, the fruit is acceptable to your birds and occasionally to 
the children; but they should never be set as street trees, since the falling 
fruit becomes disagreeable to passers by. Plant them on the lawn, rather in 
the rear, if only for poultry and birds. 
Russian mulberry makes a nice hedge if kept pruned and is a forest tree 
of small growth. 
BIRCH. 
All the birches seem to thrive here, but as a lawn tree the cut-leaved 
weeping birch is the finest. Common white or paper birch is very fine. 
Do not forget that the Catalpa speciosa is one of the most successful 
trees in Denver and your own city. And while planting trees, if you neglect 
the oaks, you will regret it. 
The red oak (Quercus rubrum) is a rapid growing tree. 
The pin oak (Quercus palustris) is probably the finest shade and _ street 
tree of the oak family. There should be avenues of oak which seem to be 
satisfactory in Colorado if not at too high an altitude. 
Plant trees. Plant a variety of trees. Plant very many trees and make 
your city one of the handsomest places on God’s footstool. 
