( ^3 ) 



l* here is a kind of boggy land, which can-s 

 not be drained by means of furface-drains: the 

 foil is like batter, and would run fide to fide, 

 and clofe them up in a few days, unlefs lined by 

 fome hard fubftance. But by under-drains i£ 

 maybe drained witheafe; becaufe there is ge- 

 nerally a hard bottom to be found at fome dif- 

 tance from the furface ; the pulpy part being 

 occafioned by a ftrong fpring at the head of 

 the bog, from which the water continually 

 oozes, and lodges in the porous parts, but does 

 not fink to any confiderable depth. Proper 

 draining will render fuch ground firm and ufe- 

 ful : but it will be necefTary to cut fo deep in- 

 to the folid earth as to prevent the drains from 

 ever overflowing, and the water from running 

 under the boggy part. 



Clay-lands are the mofl expenfive to drain* 

 They, like every other foil, may have fprings 

 at a fmall depth from the furface: in that cafe 

 it is proper to make ufeof under-drains; for, 

 as clay is of a cold nature, it cannot be kept 

 too dry. But they will likewifc require almofl 

 as many furface as under-drains to give them 2 

 proper degree of warmth^ which they never 



can 



