Reduce the compasses to the equivalent to eight miles, and a series of coincidences follows. They exactly span Arbor Low and Stadon; Arbor Low and an unmarked circle near Park Gate on East Moor; the latter and the double circle on Abney Moor, and, again, the same circle and two others on Brassington Moor; the Nine Ladies on Stanton Moor and the circle on Froggatt Edge; that on the Bar Brook and the most northern of the two on Bamford Moor; the southern circle on Bamford Moor and the double circle on the Ford estate near Chapel-en-le-Frith; the latter and the circle on Abney Moor, and so on, until it would seem to be worth one’s while to follow the eight miles radius from any given circle in search of its colleague. If there is any variation in the distances quoted above, it is so slight as to be scarcely perceptible on the one-inch scale Ordnance map. This is, at the least, tentative evidence of that careful system of mensuration which seems to pervade the mystery of these interesting memorials. [Illustration: Arbor Low: General View of the Southern and Western Part.] The triangular arrangement of the three chief circles calls attention to that of Stadon, situate a mile and a quarter south-east from Buxton. Its stones, like those of its neighbour, the Bull Ring, have been confiscated, and for centuries, perhaps, it yielded to the plough; nevertheless, its mounds, though almost levelled, are quite distinct, and disclose a plan probably unique in its design. It comprises an annular vallum, forming three-quarters of a circle, the fourth quarter being straight-sided for one hundred feet, and from the corners of this side expand two straight causeways or mounds for a distance of about one hundred and, presumably, one hundred and twenty feet respectively, when they then turn at an acute angle and unite in a straight line, of probably one hundred and twenty feet, almost parallel to the side of the circle. Thus they form the base of an isosceles triangle, bisected horizontally by the straight side of the circle. Unfortunately, the south-west corner of the base line is now cut off by the London and North Western Railway line from Buxton to Ashbourne, and therefore its measurements can only be estimated. If continued, the apex of this triangle would correspond with the nearest quarter of the horizon, namely, on the ridge of Stadon Hill at a point nearly due east. On the inside of the mounds, both of the circle and of the triangular adjunct, are indications of a ditch, and the usual entrances are north by west and south-east respectively. The average width of the circle from the outside of the mounds is now two hundred feet, but owing to the straight side it is subjected to more than the usual elliptical variation; the width of the mounds and ditch are twelve and ten feet respectively. These latter dimensions probably indicate that originally it must have had a fosse and vallum of no mean importance. One hundred