22 : 10. Thomson, Heredity, p. 387; Darwin, Descent of Man; Boas, Modern Populations of America, p. 571.
22: 25. Haddon, 1, pp. 15 seq.
22 : 29. The same, pp. 12–14.
23 : 8. Clark Wissler, in The American Indian, makes clear the general uniformity of American Indian types in chap. XVIII. See also Haddon, 1, p. 8, and Hrdlička, The Genesis of the American Indian, pp. 559 seq.
23 : 13. Haddon, 1, pp. 10 and 11. There are numerous other references to this fact, especially in articles in various anthropological journals, and general works on anthropology, such as those of Deniker, Collignon, Martin and Ratzel.
23 : 16. For the differentiation of skull types in Europe during the Paleolithic period, see Keith, 2, the chapters on Pre-Neolithic, Mousterian and Neanderthal man; and 1, pp. 74 seq.; as well as Osborn, 1, who also gives the dates of the Paleolithic in the table on p. 18.
24 : 3–5. This claim was put forth by Sergi, in his Mediterranean Race, pp. 252, 258–259, and was followed by Ripley in his Races of Europe.
24 : 14. Deniker, Races of Man, pp. 48–49; Ripley, p. 465.
25 : 5. Topinard, 1, 4; Collignon, 1; and Virchow, 1, p. 325; Ripley, p. 64. Ripley says: “If the hair be light, one can generally be sure that the eyes will be of a corresponding shade. Bassanovitch, ... p. 29, strikingly confirms this rule even for so dark a population as the Bulgarian.”
25 : 6. See p. 163 of this book on the Albanians.