fourteen or fixteen inches diameter, or a fquare 

 box, might anfwcr the fame purpofe, by having 

 a piece of bend leather nailed upon the end of 

 the tree, upon the upper fide, which would 

 open and ihut the fame as the valve of a 

 pump ; having a iinall piece of wood nailed 

 to the outfide of the leather : If thought pro- 

 per, to place one at each end, to let water in 

 and out at pleafure. The tree need not be 

 longer than the bank is broad. 



The expencc of draining may be calculated 

 in the fame way. 



If at a penny per rood, the expence for a 

 mile would be L. i 5 o 



If at two pence, each mile, 210 o 



If at fixpence, do. 7 10 o 



If at one {hilling, do. 15 o o 



The embankment and floping may be cal- 

 culated in the fame proportion. 



Water in this way may be led along the 

 fide of a hill for many miles. 



In fome fituations, a narrow level canal 

 could be made to tranfport goods from one 

 place to another ; which might be got done 

 at two {hillings or half a crown each rood. 



The third reafon is, That perfons may be 

 doubtful of its anfwering the end propofed. 



What 



