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202 Sir Thomas Molyneux, in 1725, says it was found apparently not long before he wrote, in accidently removing some stones. The first really detailed account, however, is that of Governor Pownall, in the second volume of the 'Archæologia' (1770). He employed a local surveyor of the name of Bouie to measure it for him, but either he must have been a bungler, or the engraver has mis- understood his drawings, for it is almost impossible to make out the form and dimensions of the mound from the plates published. In the 100 years that have elapsed since his survey was made, the process of destruction has been going on rapidly, and it would now require both skill and patience to restore the monument to its previous dimensions. Meanwhile the accompanying cuts, partly from Mr. Bouie's plates, partly from personal observations, may be sufficient for purposes of illustration, but they are far from pretending to be perfectly accurate, or such as one would like to see of so important a monument.

Its dimensions, so far as I can make out, are as follows: it has a diameter of 310 to 315 feet for the whole mound, at its junction with the natural hill, on which it stands. The height is about 70 feet, made up of 14 feet for the slope of the hill to the floor of the central chamber, and 56 feet above it. The angle of external slope appears to be 35 degrees, or 5 degrees steeper than Silbury Hill, and consequently if there is anything in that argument, it may, at least, be a century or two older. The platform on the top is about 120 feet across, the whole being formed of loose stones, with the smallest possible admixture of earth and rubbish.

Around its base was a circle of large stone monoliths (woodcut No. 63). They stand, according to Sir W. Wilde, 10 yards apart, on a circumference of 400 paces, or 1000 feet. If this were so, they were as nearly as may be 33 feet from centre to centre, and their number consequently must originally have been thirty, or the same number as at Stonehenge. From Bouie's plan I make the number thirty-two, but this is hardly to be depended upon. From this disposition it will be observed that if the tumulus were removed, or had never been erected, we should have here exactly such a circle—333 feet in diameter—as we find at Salkeld or at Stanton Drew,