8 BULLETIN 816, U. S. DEPARTMENT OF AGRICULTURE. ~ 
After a proper governing board is provided, the securing of a 
competent executive is a matter of ordinary business procedure. 
It is usually desirable that he shall be not only a good executive but 
also a man with a knowledge of trees and trained in their care, so 
that he may be a competent adviser of the board as well as its’ 
executive. . 
PLANNING FOR TREES ON CITY STREETS. 
With the help of one who knows trees and the local conditions to 
be met, the town should be studied and a suitable kind of tree selected 
P18857HP 
Fic. 7.—Increased attractiveness due to trees on a city street, as Shown by contrasting the two sides 
of the thoroughfare. If trees like red oaks, American elms, or the Eucalyptus in the distance had 
been used, the effect on this wide street would have been comparable to figure 3. The treesin the 
left foreground are umbrella trees. Merced, Calif.; midsummer. 
for each street or for a large portion of a street (figs. 1 and 3), and as 
conditions warrant the plan should be carried out as outlined. Mixed 
plantings of different sorts of trees (figs. 2 and 7) are not as pleasing 
and effective as the use of a single species for considerable distances. 
The use of only one or two kinds for a whole town is likely to be 
monotonous, and it is also undesirable because the variety most used 
may become subject to serious disease or insect attacks. The 
species and varieties of trees suitable for city planting are few enough, 
if all are used, so an endeavor should be made to include as many 
different kinds as practicable, assigning one variety for a long stretch 
of street unless there is a marked change in its character, in which 
case a change of trees would be warranted. 
Where trees are already on a street, the problem of planning for 
the future is frequently much complicated, especially if there are 
several kinds in good condition. Where there is but one good kind, 
