Note 154 — Chapter II
Reading edition
Sir John Herschel (Disc. on Natural Philosophy, p. 60) calculates that the great pyramid weighs twelve thousand seven hundred and sixty million pounds. Compare Lyell's Principles of Geology, p. 459, where the still larger estimate of six million tons is given. But according to Perring, the present quantity of masonry is 6,316,000 tons, or 82,110,000 cubic feet. See Bunsen's Egypt, vol. ii. p. 155, London, 1854, and Vyse on the Pyramids, 1840, vol. ii. p. 113.