30 College of Forestry. . 



as possible to injury by insect attacks, wind-storms, heat and 

 drought. 



Third : It should be a long-lived variety and one that im- 

 proves rather than deteriorates with age. 



Trees Should be Grown in a Nursery Specially for Street 



Use. 



After the variety of tree to be used has been decided upon, 

 a specimen of that particular sort should be selected which 

 presents the following qualities : a stem not less than 2 inches 

 in diameter, 4 feet from the ground ; a good, compact, fibrous 

 root-system confined within a comparatively small distance 

 from the stem; the branches appearing not less than 6 feet 

 nor more than 8 feet from the ground, and a top-growth or 

 crown with an even distribution of branches that have been 

 trained to grow uniformly and with a distinct leader. 



It is rarely possible to obtain from the open fields or the 

 woodlands a. specimen that satisfies the requirements of these 

 specifications. Young trees that grow without cultivation 

 usually develop a root-system that reaches far from the stem 

 of the tree. When the tree is dug from its natural growing 

 place most of the small feeding roots are severed, thus chang- 

 ing the physical condition in such manner as to retard 

 severely the beginning of new growth. In the nurseries 

 where trees are grown especially for transplanting, the top 

 growth is trimmed and the roots pruned in such a way that 

 the trees may be moved without a severe setback. 



THE PROPER PREPARATIONS FOR PLANTING 

 STREET TREES. 



All preparations should be made in advance if possible so 

 that the tree may be planted immediately upon its arrival in 

 its new location. When trees are to be planted in quantity it 

 is advisable to prepare the soil during the summer in the case 

 of autumn planting, or during late .autumn in the case of 

 spring planting. This allows the soil to become thoroughly 

 settled by the planting time. 



