COST 209 



The description of rock used will also, in 

 a certain measure, affect the calculations, as 

 some kinds of stone weigh so much heavier 

 than others in comparison to their bulk. A 

 solid block of sandstone (quartzite), weigh- 

 ing one ton, would contain fourteen and a half 

 cubic feet, while the same weight of whinstone 

 (basalt) would only contain twelve and a half 

 cubic feet. So it is apparent that the bulk 

 is very considerably affected by the nature of 

 the rock. 



For building a dry wall, estimating the 

 stonework at two feet thick, it would require 

 about three-quarters of a ton of stones for 

 every square yard. I have not touched on 

 the question of cost as regards the actual 

 building of the rockwork, as this calls 

 for considerable artistic skill, and is alto- 

 gether outside the sphere of ordinary 

 labour. There are many landscape gardeners 

 nowadays whose services can be obtained, 

 if desired, at fees varying from one guinea 

 to four guineas per day, according to skill 

 and reputation. 



When it is necessary to dig sand or small 



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