OF THE COUNTY OF TYRONE. 193 



not require fome mode peculiar to itfelf. There is, 

 however, one circumflance, which muft always be 

 complied with where necefTary ; otherwife watering, 

 inftead of improving land, will injure it, and render it 

 worfe than before the operation took place. This is, 

 the effeft ually getting clear of fprings, and flagnated 

 xvater, before irrigation be attempted. 



The great point to confider is, to cheapen the work 

 as much as poflible, where draining is necefTary prior 

 to watering, as many of thofe drains, neceflary to drain 

 the land, may be alfo found ufeful to aft as conductors 

 or leaders, to anfwer irrigation ; that is, when the aft 

 of irrigation is not going on, many of the drains may 

 perpetually aft in draining. 



There has been a good deal {aid of late, on the fub- 

 jeft of draining, by Elkington and others, to which I 

 refer. In many cafes, great accuracy in levelling is re- 

 quifite : the fpirit level is not in the power of every far- 

 mer, and even if it was, few underftand the application 

 of it. The common mafon's level is tedious ; for ex- 

 pedition, the ifofceles triangle is the beft, and is as ac- 

 curate as any : with this a man can level almoft as faft 

 as he can walk, attended by a boy to carry pins, to 

 Aick down where the level may point out. 



There 



