101 : 12. Osborn, 1, note VII, p. 511, of the appendix; and Merriam, pp. 205–208.
101 : 15. J. Pilgrim, The Correlation of the Siwaliks with Mammal Horizons of Europe.
101 : 21. Java and the Pithecanthropus erectus. Dubois, E. Fischer, and particularly G. Schwalbe. For the land connection of Java with the mainland see Alfred Russel Wallace’s Island Life, and The Geography of Mammals, by W. L. and P. L. Sclater.
101 : 27. Gunz glaciation. See Osborn’s table of Geologic Time, in 1, p. 41. The date given here is that made by Penck.
102 : 1. W. D. Matthew, Revision of the Lower Eocene Primates, and W. K. Gregory, The Evolution of the Primates.
102 : 13. Schoetensack, Der Unterkiefer des Homo Heidelbergensis aus den Sanden von Mauer bei Heidelberg im Beitrag zur Paläontologie des Menschen.
102 : 21. At the beginning of this Eolithic period wood was used for clubs and probably as levers along with the chance flints. Perhaps it was employed even earlier, but of course no remains would come down to us.
CHAPTER II. PALEOLITHIC MAN
For the material in this chapter the authorities, such as Cartailhac, Boule, Breuil, Obermaier and Rutot are all given in Osborn, 1, together with useful discussions of the evidence. In special instances additional sources are inserted here.
105 : 17. Piltdown Man. See Charles Dawson, the discoverer, 1, 2 and 3. There is a tremendous bibliography on the Piltdown Man.