A Street Tree System for New York City 61 



III. Street Tree Planting- Specification No. 3. 

 (Estimated cost $25 to $35 per tree.) Cost varies accord- 

 ing to the style of grating used. 



This specification is suggested for use under fairly favor- 

 able conditions and is adapted for residence or business 

 streets where traffic conditions make gratings desirable or 

 necessary, but where heavy guards are not demanded. 



IV. Street Tree Planting Specification No. 4. 

 (Estimated cost $40.) 



This specification is for use under the most unfavorable 

 conditions where tree planting is at all possible and is 

 adapted for congested business streets where the traffic 

 makes necessary an extra heavy tree guard as well as a 

 grating. 



Note. — This grating and guard have been specially 

 designed with the idea of easy removal so that frequent 

 cultivation of the soil is possible. 



V. Street Tree Planting Specification No. 5. 

 (Estimated cost $50 to $60.) 



This specification is for use under the same conditions 

 as No. 4 and is adapted for the same class of streets. This 

 specification is at present in use by the Park Department. 

 It differs from Specification No. 4 in that the tree guard is 

 square instead of round, and of lighter construction, while 

 the area of the grating is slightly larger. This specification 

 is admirable save for the fact that the difficulty of removing 

 the grating makes frequent cultivation impossible. While 

 a degree of cultivation may be given through the openings 

 in the grating, such cultivation will never be wholly 

 satisfactory. 



