Beh 33 
cafes, filling up the refidue of the drain to the top, 
= 
or near the top, with loofe ftones;. bur the fault, ia 
the greater part of the under-drains tnat have been 
made, has been, that they have not been made deep 
enough to anfwer the purpofe of draining» the 
ground effectually ; the object of them having been 
oftener directed to drain the water from the furiace, 
(where perhaps it does in fact. but little injury) in. 
ftead of draining off the land fprings, which are 
in, or run upon, the under-{tratum, and which are 
poifon to vegetation. 
In fome few parts of this diftri@, where ftones 
are fcarce, and thofe not of a fhape well-adapted 
to the purpofe, particularly about Steeple-Afhton, 
much ingenuity is fhewn in the different methods 
of draining which have been introduced. 
Turf drains.—In fome inftances, they have drained 
land to the depth of three or four feet, by firft dig- 
ging a fpit of earth out, and then boring out the 
ground with a three-inch borer, fo as to forma pipe 
of the depth required, and only three inches wide. 
If the foil be loofe, they have drawn in {mall 
bufhes or boughs, fo as to keep it from running to- 
gether; but if ftrong and tough, and where the 
pipe is not required to be fo deep, they have left 
the pipe open, turning down the firft {pit upon the 
fhoulders of the pipe, with the grafs fide underneath. 
In other cafes, where only fmall round ftones 
could be got, and thofe not plentifully, they made 
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