We continued our journey through this rough country, and passed half round the bottom of the famous Skidhaw, a high mountain named from its fancied likewise to a shoe (_yscyd_.) Penruddoc, a town near it, with a Welsh name. These desolate and hilly regions were the retiring places of the Britons from the power of the Romans; which perhaps is the reason of the great number of temples scattered throughout the country; for a mile before we came to Keswick, on an eminence in the middle of a great concavity of those rude hills, and not far from the banks of the river Greata, I observed another Celtic work, very intire: it is 100 foot in diameter, and consists of forty stones, some very large. At the east end of it is a grave, made of such other stones, in number about ten: this is placed in the very east point of the circle, and within it: there is not a stone wanting, though some are removed a little out of their first station: they call it the Carsles, and, corruptly I suppose, Castle-rig. There seemed to be another larger circle in the next pasture toward the town. The ascent to this hill (Skidhaw) is from the east; for the west side of it is exceeding steep, and drawn down into frightful ribs, like the roots of a tree. There is a place on the top called Skidhaw maen; a kind of sea-mark, by what information I could get: it seems to be a _kist-vaen_. Cnut-berries grow a-top of it, a delicious fruit. There is no doubt, that when the globe of the earth received its motion round its _axis_, all the solid parts of metals, minerals and stone, flew to the outward parts at farthest distance from the centre, contrary to the assumption of our theorists, and the laws of Nature; for which reason we find the most hard materials on the highest mountains: these by time, and the heat of the external air, consolidated, and left great cavities lower down, when the matter underneath came closer together, and could not bring down these arch-like bodies: at length, when the parts of the globe became accustomed to this motion, the remainder of its internal matter I will allow to sink according to its specific gravity; and questionless the central constituents are heavier than that between it and the present surface; and probably this is fluid. Supposing then the matter of iron-stone fell to the centre, it formed a great magnet, according to Dr. Halley’s _hypothesis_, and may have a liberty of turning round itself with a slow motion, the intermediate fluid giving it that liberty; though, as to a subterraneous world, as that famous mathematician would suggest, I cannot believe the least of it: but this internal magnet, being not fastened to the whole earth, will naturally, as he supposes, have a motion of its own, somewhat different from that of the earth, and retain a regular revolution of that motion; which solves the famous variation of the magnetic needle.