SHADE TREES. 257 



Location. If the importance of the location of a tree were better 

 ivulized, much more accurate valuations would be given trees which 

 have been destroyed. For instance, a tree located on a well-planted avenue 

 is worth more than one growing on a poorly planted avenue. 



A tree forming part of a symmetrical line of trees is, as a rule, of more 

 value than one of an irregular group. 



A tree planted too closely to others is of less value than one which has 

 a chance to grow without restriction. 



A tree located in a wide tree belt is worth more than one growing in a 

 narrow tree belt. 



A tree growing on a narrow avenue is of less value than one on a wide 

 avenue, for in the latter case the water mains, sewers, etc.. may be farther 

 from the roots, which are less likely to become injured. 



A tree growing inside the sidewalk is of more value than one growing on 

 the edge of a road near the curbing, or in a ditch. Usually the farther 

 from the roadbed the tree is located, at least in cities, the more valuable 

 it is, for the roots are often amputated close to the trunk in street exca- 

 vating, sidewalk and curbing construction, etc., and the tree is much more 

 liable to injury from horses and trucks, runaways, etc. 



A tree growing in a street where water mains, sewers, underground 

 conduits and gas pipes are so numerous as to necessitate digging up the 

 roadbed cannot have the value of one growing in an undisturbed roadbed. 



A tree planted near manufacturing establishments or in other locations 

 where it is subject to an atmosphere of smoke and various gases is also 

 unfavorably located since its expectation of life is reduced. 



A tree located where it is likely to become affected by sun scorch or 

 drought is of less value than one growing under more normal conditions. 

 Cultivated soil is better for a tree than a lawn, mowing or pavements, 

 but next to cultivation the lawn conditions are most favorable. Abnormal 

 chemical conditions of the soil and unsuitable soil texture affect growth 

 and development. The location of a tree as regards distance and direction 

 from a residence are important from the shade point of view. 



Trees located close to oiled roadbeds are unfavorably situated, since 

 the dust from oiled roads injures foliage. There is also a possibility of the 

 roots themselves being affected by the oil. 



On account of variation in their susceptibility to disease and to injury 

 from climatic conditions, trees are often of more value in one location 

 than another; for instance, those growing in country towns are usually 

 under more wholesome conditions than those in cities. They may also be 

 located in situations where certain pests thrive. While trees in cities are 

 relatively short lived, they are considered of more value than town trees, 

 because they serve a larger population. 



The nature of the species and the conditions under which a tree is 

 growing help to determine its expectation of life. An elm tree may live 

 for two hundred to three hundred years in some localities, and in others 

 sixty or seventy years is its limit, while the duration of life of other trees 

 is even more restricted. 



