(186) For the explorations in Belgium, see Dupont, Le Temps Prehistorique en Belgique. For the discoveries by McEnery and Godwin Austin, see Lubbock, Prehistoric Times, London, 1869, chap. x; also Cartailhac, Joly, and others above cited. For Boucher de Perthes, see his Antiquites Celtiques et Antediluviennes, Paris, 1847-'64, vol. iii, pp. 526 et seq. For sundry extravagances of Boucher de Perthes, see Reinach, Description raisonne du Musee de St.-Germain-en-Laye, Paris, 1889, vol. i, pp. 16 et seq. For the mixture of sound and absurd results in Boucher's work, see Cartailhac as above, p. 19. Boucher had published in 1838 a work entitled De la Creation, but it seems to have dropped dead from the press. For the attempts of Scheuchzer to reconcile geology and Genesis by means of the Homo diluvii testis, and similar "diluvian fossils," see the chapter on Geology in this series. The original specimens of these prehistoric engravings upon bone and stone may best be seen at the Archaeological Museum of St.-Germain and the British Museum. For engravings of some of the most recent, see especially Dawkin's Early Man in Britain, chap. vii, and the Description du Musee de St.-Germain. As to the Kessler etchings and their antiquity, see D. G. Brinton, in Science, August 12, 1892. For comparison of this prehistoric work with that produced to-day by the Eskimos and others, see Lubbock, Prehistoric Times, chapters x and xiv. For very striking exhibitions of this same artistic gift in a higher field to-day by descendants of the barbarian tribes of northern America, see the very remarkable illustrations in Rink, Danish Greenland, London, 1877, especially those in chap. xiv. As a result of these discoveries and others like them, showing that man was not only contemporary with long-extinct animals of past geological epochs, but that he had already developed into a stage of culture above pure savagery, the tide of thought began to turn. Especially was this seen in 1863, when Lyell published the first edition of his Geological Evidence of the Antiquity of Man; and the fact that he had so long opposed the new ideas gave force to the clear and conclusive argument which led him to renounce his early scientific beliefs.