f. 200 “4 
them in, efpecially in the neighbourhood of the 
manufacturing towns. 
/ 
DRAINING, 
Tue ufe of covered drains has been long known 
in many parts of this diftrid. 
They have been made in different modes with 
turf, with wood, with ftone, but chiefly with the 
latter, on account of the facility of getting it, 
there being but few parts without {tone of fome 
kind or other, within a moderate diftance. 
Stone drains.—The ftone of the corn grate rock, 
which compofes the under ftratum of fo large a 
portion of this diftrict, is of a peculiarly favourable 
flat fhape for under-drains; and no land requires 
it more than the vein of cold clay, which fo fre- 
quently accompanies this rock. Much of this kind 
of land has been fo drained, and much remains yet 
to be done. The drains of this ftone have been, 
in general, made about ten or twelve inches wide, 
with perpendicular fides, In fome cafes, the ftones 
are fo placed, as to leave a water-courfe at bottom, 
by fetting two flat ftones triangularly to meet at 
the points; in others, and perhaps a better way, 
by covering the bottom with a flat ftone, and then 
putting three other flat ftones upright, leaving the 
water to find its own way between them; in both 
cafes, 
