SHADE TREES. 



141 



trees. Trees, however, do not grow with the same uniformity throughout 

 their period of existence. At first they start in to grow more or less slowly, 

 A\'liich is generally followed between the tenth and thirtieth year by the 



• • • 



• • • 



Fig. 11. — Plan of street at Hadley, Mass., approxi- 

 mately 300 feet wide, provided with two driveways 

 with green (G ) in center and generous tree belts. 



maximum development, this being followed throughout the remaining 

 cycle by a gradual diminution in growth. (See Fig. 10.) 



The following list, showing the average growth of trees, represents 

 approximately what a 3-inch sapling will develop into in twenty years. 



Streets and Avenues. 



The modern city streets are, as a rule, much better laid out for tree 

 planting than the older ones, although there are some exceptions to this. 

 In the Connecticut valley, where there is considerable level land, the 

 early settlers showed remarkable judgment and taste in laying out their 



