2o8 ROCK GARDENS 



accuracy. Judging from personal experience, 

 I would say roughly, but it must of necessity 

 be a very rough estimate, that, taking one 

 part with another, banks varying in gradient 

 from four in ten to two in ten would take 

 about one ton of rocks to every ten square 

 yards. The steeper the formation the more 

 and larger the rocks required. Parts with a 

 gradient of one in two would demand from two 

 to three tons for the same extent of ground. 

 The rocks I here refer to are not large masses 

 weighing fifteen or sixteen cwt. each, but 

 good serviceable stones weighing from one to 

 five cwt. apiece, say about ten to fifteen rocks 

 to a load of one ton. These figures are based 

 on what I used in my own garden. In it 

 the actual rockwork, including parts with 

 rocks scattered only here and there, covers 

 about twelve hundred square yards, and took 

 about one hundred and thirty tons of rocks. 

 The gradients vary from five and a half in 

 eight, in the steepest parts, to two in ten, 

 on the gentlest slopes. A good, useful, and 

 eff^ective gradient is about three and a half 

 in ten. 



