[44] Hoernes, 1903. Urgeschichte des Menschen. (2nd Edn., 1908.)
[45] Obermaier, 1909. L'Anthropologie. Tome XX. p. 521.
[46] Sollas, 1908. Science Progress in the XXth Century, “Palaeolithic Man.” (Reprinted in book-form, 1911.)
[47] Boyd Dawkins, 1910. Huxley Lecture. Royal Anthropological Institute, 1911.
CHAPTER VI
[48] Gaudry, 1878. Mammifères tertiaires.
[49] Klaatsch, 1909. Prähistorische Zeitschrift. Band I.
[50] Keith, 1911. Nature, Feb. 16, 1911 ... also Dec. 15, 1910.
[51] Schliz, 1909. Archiv für Anthropologie. Band 35, Ss. 239 et seq. “Die vorgeschichtlichen Schädeltypen der deutschen Länder.”