On Hathersage Moor in the high Peak, not far from the road that goes from Sheffield to Manchester, is a British work, called Cair's work. See the plan Pl. XIII. fig. I. It is about two hundred yards in length, and sixty-one in width. It takes in an hill precipitous all round, except at the north end, where there is a wall of a very singular construction. It is near three feet thick, and consists of three rows of very large stones. On the top are other large stones, set obliquely end ways, a view of which is in the same plate fig. I. at b. The inside is filled up with earth and stones, which form the vallum, and slope inwards twenty-five feet. The height of the wall to the top of the sloping stones (as abovementioned) is nine feet four inches. The principal entrance seems to have been at the east end of the wall; a lesser one is on the west side; both marked (c) in the plan. The area of this work is full of rocks and large stones; several of these are rocking stones, three of which are engraved in Plate XIII. fig 2. (a) thirteen feet in length, (b) eight feet, (c) nine feet fix inches; and others have rock basons.