[1503] The Age of the Philadelphia Red Gravel, Proc. Boston Soc. of Nat. Hist., vol. xxiv.
[1504] Antiquities of the Southern Indians, p. 293. The preface of this volume is dated “New York, April 10, 1873.” In an article in the North American Review for January, 1874 (vol. cxviii. p. 70), on “The Antiquity of the North American Indians,” he traces that race back to palæolithic times.
[1505] Flint implements from the stratified drift of the vicinity of Richmond, Va., in the American Journal of Science (3d series), vol. xi. p. 195; quoted in Dana’s Manual of Geology, p. 578.
[1506] Sixth annual report of the Geological and Natural History Survey of Minnesota, 1877, p. 54.
[1507] Her paper on “Ancient quartz-workers and their quarries in Minnesota,” read before the Minnesota Historical Society, February, 1880, was reprinted in The American Antiquarian, vol. iii. p. 18.
[1508] Vestiges of Glacial Man in Central Minnesota, in the Proc. Amer. Assoc. for Adv. of Science, vol. xxxii. p. 385. A more extended account of her researches will be found under the same title in the American Naturalist for June and July, 1884 (vol. xviii. pp. 594 and 697). On p. 705 the writer has given at some length his opinion in regard to the artificial character of these quartz objects.
[1509] Proc. of Boston Soc. of Nat. Hist., vol. xxiii. p. 436.
[1510] In 1877, by Professor S. S. Haldeman on an island in the Susquehanna River, in Lancaster Co., Penn. (Eleventh Rep. Peabody Mus., vol. ii. p. 255). In 1878, by A. F. Berlin in the Schuylkill Valley, at Reading, Penn. (American Antiquarian, vol. i. p. 10). In 1879, by Dr. W. J. Hoffman in the valley of the Potomac, near Washington (American Naturalist, vol. xiii. p. 108). Subsequently by others in the same vicinity, reported by S. V. Proudfit in The American Anthropologist, vol. i. p. 337. By David Dodge at Wakefield, Mass., and by Mr. Frazer at Marshfield, Mass. (Proc. of Boston Soc. of Nat. Hist., vol. xxi. pp. 123 and 450). By the writer, in several localities in New England (Ibid. p. 382).
[1511] Sixth annual report of the U. S. Geological Survey of the Territories, by F. V. Hayden (1873), p. 652.
[1512] Ibid. (1874), p. 247.