[40] These calculations can be studied at the British Museum side by side with an excellent model of Stonehenge. On the supposition that Stonehenge was a sun-temple, its date has been astronomically determined as about 1680 B.C., with a possible error of two centuries either way.
[41] Emiland Gauthey, “Traité de la Construction des Ponts,” A.D. 1809-1816.
[42] “The Travels of Marco Polo.” Everyman’s Library, p. 315. It is to be remembered that Marco Polo’s “paces” are geometric.
[43] Professor Fleeming Jenkin’s “Essay on Bridges.”
[44] For criss-cross piers, see [Index].
[45] Forked boughs were used in the building of roofed walls, and bent trees in the building of gabled cabins.
[46] Sir Ray Lankester, “Daily Telegraph,” August 27, 1913, p. 6.
[47] Robert Munro’s “Archæology and False Antiquities,” p. 12.
[48] Tacitus remarks of these wild tribesmen: “They are accustomed to make artificial caves in the ground, and they cover them with great heaps of dung, so as to form a shelter during the winter, and a storehouse for the produce of the fields. For in such dwellings they moderate excessive cold, and if at any time an enemy should come, he ravages the parts that he can see, but either discovers not such places as are invisible, and subterraneous, or else the delay which search would cause is a protection to the inmates.”
[49] Boyd Dawkins, “The British Lake Village,” 1895; Sidney O. Addy, “The Evolution of the English House”; “The Times,” September 19, 1895; “Manchester Guardian,” September 22, 1896; and A. Bulleid, “Somersetshire Arch. and Nat. Hist. Society’s Proceedings,” 1894, reprinted in 1895.