[11] W. L. H. Duckworth, Prehistoric Man, 1912, p. 8.
[12] For the relation between chin formation and power of speech, see E. Walkhoff, "Der Unterkiefer der Anthropomorphen und des Menschen in seiner funktionellen Entwicklung und Gestalt," E. Selenka, Menschenaffen, 1902; H. Obermaier, Der Mensch der Vorzeit, 1912, p. 362; and W. Wright, "The Mandible of Man from the Morphological and Anthropological points of view," Essays and Studies presented to W. Ridgeway, 1913.
[13] Cf. W. L. H. Duckworth, Prehistoric Man, 1912, p. 10, and A. Keith, The Antiquity of Man, 1915, p. 237.
[14] A. Smith Woodward, 1070 c.c.; A. Keith, 1400 c.c.
[15] G. G. MacCurdy, following G. S. Miller, Smithsonian Misc. Colls. Vol. 65, No. 12 (1915), is convinced that "in place of Eoanthropus dawsoni we have two individuals belonging to different genera," a human cranium and the jaw of a chimpanzee. Science, N.S. Vol. XLIII. 1916, p. 231. See also Appendix A.
[16] For a full description see Quart. Journ. Geol. Soc. March, 1913. Also A. Keith, The Antiquity of Man, 1915, p. 320, and pp. 430-452.
[17] C. Dawson and A. Smith Woodward, "Supplementary Note on the Discovery of a Palaeolithic Human Skull and Mandible at Piltdown (Sussex)," Quart. Journ. Geol. Soc. April, 1914.
[18] The Antiquity of Man, 1915, p. 209.
[19] Thus Lucretius:
"Arma antiqua manus, ungues, dentesque fuerunt,
Et lapides, et item silvarum fragmina rami."