DRAINIiN'G AX ACRE OF LAND. 131 



Differing circumstances necessarily render it impossible to 

 assign one cost as a universal rule in drainage. The in- 

 stances of cost given in the Table comprehend a variety of 

 soils and subsoils, the texture of which occasioned very 

 different "wages to be given for opening out the trenches. 

 The pickaxe had to be resorted to in Nos. 6, 7, and 9 ; 

 whereas Nos. 1, 2, 3, 4, 5, exhibit the usual charge in the 

 district for excavating uniform, or, as 3'ou may well call 

 them, Iwnest, clays at the depths cited. 



Journal of the R. A. S. E., vol. vi. part 1. 



