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that water from the roots, which otherwife Vies 

 there, flarves the ulefu) herb, and perhaps pro- 

 mores the growth of the noxious weed. In 

 this infrance under-draining has the advantage 

 of furface-draining. Rv rhe former method, 

 the drain is cue deep enough to carry the foak 

 or underwent away ; but were they made as 

 deep in furface-draining, it would anfwer the 

 purpofe, and it would take the water off much 

 quicker -, which is certainly an advantage* 

 Though imder-drains be conftru6ted with the 

 greateft pofUble care, they are neverthelefs lia- 

 ble to obftrudions, which cannot be difcover- 

 ed without expenfive fearch ; but in furface- 

 drains, as they lie open to the eye, any ob- 

 flruclion may immediately be removed at a 

 very trifling expence, fcarce worth mentioning : 

 but under-draining properly executed is al- 

 ways the cheapeft. 



Some land fubjedi: to rot flieep, I think it 

 beyond the art of man to drain fufficiently by 

 iindor-drains to prevent that effed : but, with 

 the ex'ception of flooded land, there are few 

 lands in the kingdom that may not be made 

 found by furface-draining properly executed. 



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