Note 217 — CHAP. XVI. Of Ridges.
Reading edition
For if they are made with the Descent, and not across it, then they will be parallel to the Rills of Water, that run upon the Surface of the Clay under the Staple (or upper Stratum of Mould), and would be no more effectual for draining the Hill, than the digging of one River parallel to another, without joining it in any Part, would be effectual for draining the other River of its Water.