THE PLACING OF SHADE TREES 73 



(5) The Potted Type. This is for streets where brick 

 or stone paving monopolizes the space and makes natural 

 tree growth and development impossible. It is extremely 

 formal, and can be used for narrow streets lined with 

 handsome buildings, or for a paved plaza or thoroughfare 

 largely devoted to vehicular traffic, as in the case of the 

 Park Avenue approach to the Grand Central Terminal in 

 New York; sidewalks and street pavements cover all 

 surface, leaving no place in which the usual street trees 

 would have a chance to live. By planting small trees in 

 tubs or boxes and placing these containers on the sidewalk 

 or in the center of the driveway, these man-made obstacles 

 may be overcome. They are similarly used in some of the 

 streets of Paris, notably the Rue de Rivoli. The effect 

 may be strikingly pleasing and highly desirable when 

 ordinary tree planting is not possible, due to neglect to 

 provide proper conditions in the original development, or 

 to the necessity of meeting exceptional features in design. 

 It is possible by this means to use different trees for 

 succeeding seasons; but, on the other hand, much greater 

 care is required to maintain them than to maintain trees 

 planted in openings in the paving, and thus the expense 

 is very greatly increased. 



(6) The Informal Type. On country roads, especially 

 in a rolling or a hilly country, or on secondary highways, the 

 formality of trees in straight lines, at regular distances 

 apart, and of uniform size and appearance is inappropriate, 

 as well as being tiresome to those who may find it neces- 

 sary to travel along such roads. In contrast to such 

 arrangement, trees of many species may be scattered at 

 irregular intervals along the roadside, but selected and 

 arranged in such manner as to accentuate the natural 

 beauties of the country through which the road passes. 

 Such informal planting needs equally as much thought 



