33 : 13. Haddon, 1, p. 16 seq.; Deniker; Ratzel; etc.
33 : 23–34: 21. Haddon, 1, pp. 2 and 3, and Deniker, 2, pp. 42 seq. While this classification is substantially sound, and sufficient for our purpose, recent investigations have shown that other factors also contribute to straightness or kinkiness, such as coarseness of texture, as opposed to fineness. Probably these will be determined by Mr. Louis R. Sullivan, of the American Museum of Natural History, who is working on the subject. It has been found that the Japanese and Eskimo are exceptions to the rule of “straight hair, round cross section,” for they show an ellipse. There is also a wide range of variation in the cross-sections of hair for individuals of any race, who are classified according to the preponderance of cross-sections of a single type. For a fine series of plates which are photographs of the magnified hair of individuals of various races, see Das Haupthaar und seiner Bildungsstatte bei den Rassen des Menschen, Gustave Fritsch. Another recent paper is the study by Leon Augustus Hausmann of Cornell, “The Microscopic Structure of the Hair as an Aid in Race Determination.”
35 : 27. Livi, Antropometria Militare, and Ripley, pp. 115, 255 and 258.
36. Deniker, 1; Zampa, 1,2; Weisbach, 1, 2, 3; and others given by Ripley, pp. 411–415.
CHAPTER III. RACE AND HABITAT
37 : 6. Sir G. Archdall Reid, The Principles of Heredity, chaps. VII, VIII, IX.
37 : 17. Ripley discusses them in full in chap. VI.
37 : 20–38 : 2. W. Boyd Dawkins, Early Man in Britain, p. 233; Keane, Ethnology, pp. 110 seq.; Osborn, Men of the Old Stone Age, pp. 220, 479–486 seq.; Keith, Antiquity of Man, p. 16.
38 : 10. Ellsworth Huntington, 1, p. 83; Charles E. Woodruff, 1, pp. 85–86; also the Report of the Smithsonian Institution for 1891, which contains an article on “Isothermal Zones.”
38 : 17 seq. Ellsworth Huntington, 1, pp. 86 seq.