THE USE OF ROCKS 171 



trived in the upper part of Central Park, Xew York 

 City, where a lot of great boulders, weighing tons each, 

 have been brought together so as to make a solid arch, 

 under which a stream of water, with hea^y rocks strewn 

 on its edge, passes. The region is a deep gorge ^^ith high, 

 rocky, wooded slopes, and a carriage-road thai passes 

 over the arch gives a sufficiently good reason for its con- 

 struction. The result is beautiful and natural, although 

 unexpectedly picturesque. 





ROUGH STONE WALL AND COPING 



If water can be brought directly against a sheer mass 

 of rock five or ten feet high, the effect of rock and 

 water is generally fine. In the same way, artificial con- 

 structions of dry walls of rocks, used as dividing bar- 

 riers between different parts of the property, can be 

 employed in connection with vines and shrubs in an en- 

 tirely satisfactory way. But cemented stone-work, em- 

 ployed in formal lines, should properly be restricted to 

 buildings or terraces. It is a mistake to underrate the 

 difficulty of doing good landscape work with rocks, and 

 though probably few people realize it, it is a fact, never- 



