[9] James D. Dana, “Reindeers in Southern New England,” in American Journal of Science, 1875, p. 353.

[10] See “On an Ancient Human Footprint from Nicaragua,” by D. G. Brinton, in Proceedings of the American Philosophical Society 1887, p. 437.

[11] J. S. Wilson, in Memoirs of the Anthropological Society of London, Vol. III., p. 163.

[12] The finders have been Messrs. H. P. Cresson and W. H. Holmes. From my own examination of them, I think there is room for doubt as to the artificial origin of some of them. Others are clearly due to design.

[13] Her account is in the American Naturalist, 1884, p. 594, and a later synopsis in Proceedings of the American Association for the Advancement of Science, 1889, p. 333.

[14] G. K. Gilbert, in The American Anthropologist, 1889, p. 173.

[15] W. J. McGee, “Palæolithic Man in America,” in Popular Science Monthly, November 1888.

[16] See G. Frederick Wright, The Ice Age in North America.

[17] Dr. Abbott has reported his discoveries in numerous articles, and especially in his work entitled Primitive Industry, chapters 32, 33.

[18] De Mortillet, Le Préhistorique Antiquité de l’Homme, p. 132, sq.