[1493] Proceedings of Boston Soc. of Nat. Hist., Ibid. p. 132.

[1494] Popular Science Monthly, January, 1889, p. 411.

[1495] On the discovery of stone implements in the glacial drift of North America, in the Quart. Journ. of Science (London, January, 1878), vol. xv. p. 68.

[1496] The Trenton gravel and its relation to the antiquity of man, in the Proceedings of the Academy of Natural Sciences of Philadelphia, 1880, p. 296.

[1497] Primitive Industry, p. 533 et seq.

[1498] The bibliography of Professor Wright’s publications upon this subject will be found in Proc. Boston Soc. of Nat. Hist., vol. xxiii. p. 427.

[1499] Science, vol. i. p. 271.

[1500] Proc. Boston Soc. of Nat. Hist., vol. xxiii. p. 435.

[1501] Proc. Amer. Assoc. for Adv. of Science, vol. xxxvii.

[1502] Early Man in the Delaware Valley, in the Proc. Boston Soc. of Nat. Hist., vol. xxiv.