[J] American Geologist, vol. viii, p. 241.

[K] Transactions of the Leeds Geological Association for February 10, 1893.

[L] Quarterly Journal of the Geological Society, August, 1891.

[M] Fortnightly Review, November, 1893, p. 633; reprinted in The Popular Science Monthly, vol. xliv, p. 790.

[N] La Période glaciaire (Félix Alcan. Paris, 1889).

[O] American Geologist, vol. viii, p. 242.

[P] Ibid., p. 241.

[Q] Ibid., p. 242.

[R] Congrès International d’Archéologie, Moscow, 1892.

[S] Nineteenth Century, January, 1894, p. 151, note.