[ 23 ] 



lowing calculation, upon an average, will 



be pretty exadt for an acre ; 



/. s.d. 

 Sinking the ditch to obtain an outfall 076 

 Drawing the furrows - - -026 



160 poks of digging and filling up, at 2^:^. I 6 8 

 Wood, eftimated at a faggot of twelve") 



feet long to a pole, carriage in- > 2 13 4 

 eluded, at 4^. per faggot - J 

 Half a load of ftraw, and carriage -070 

 Extra-digging in the ends where the? 

 plough will not reach - 3 ^ 



This improvement varies according to 

 the foil. Upon an abfolute fand it will 

 indeed barely anfwer. Upon a gravel, 

 which is the foil where fprings moft 

 abound, or upon a mixture of loam and 

 gravel, it will laft from five to twelve 

 years. Upon a clay, or fliff cohelive foil, 

 it will laft twenty. But even in the for- 

 mer cafe, it is apparent that it will an- 

 fwer the expence, as it is done in ge- 

 neral by the rack-tenants in that county, 

 C 4 and 



