[198] Census of India, 1901, General Report by H.H. Risley and E.A. Gait, Vol. I, Part I, pp. 500-504; and Ethnographic Appendices by H.H. Risley, Vol. I, map, p. 60. Calcutta, 1903. P. Vidal de la Blache, _Le Peuple de l'Inde, d'apres la serie des recensements_, pp. 431-434, _Annales de Geographie_, Vol. XV. Paris, 1906. [199] Hans Helmolt, History of the World, Vol. III, pp. 422, 424, 434-436. New York, 1902-1906. [200] D. Livingstone, Missionary Travels, pp. 97-102. New York, 1858. [201] James Bryce, Migrations of the Races of Men Considered Historically, _Scottish Geographical Magazine_, Vol. VIII, pp. 400-421, May, 1892. [202] Justus Perthes, _Taschen Atlas_, p. 78. Gotha, 1905. [203] _Ibid._, p. 80. [204] Hugh R. Mill, International Geography, p. 878. New York, 1902. [205] Hans Helmolt, History of the World, Vol. I, pp. 189-191. New York, 1902-1906. [206] Hodgkin, Italy and Her Invaders, Vol. VI, pp. 23-27, 38-42, 63-68, 83-87. Oxford, 1896. [207] McGee and Thomas, Prehistoric North America, Chap. XXI, Vol. XIX of _History of North America_, Philadelphia, 1905. [208] _Ibid._, pp. 83, 87, Map of Migrations, p. 3. [209] Archibald Little, The Far East, pp. 34-38. Oxford, 1905. [210] Strabo, Book VIII, chap. I, 2. [211] Heinrich Barth, Travels in North and Central Africa, Vol. II, p. 548. New York, 1857. [212] Joseph Partsch, Central Europe, pp. 104-105. London, 1903. [213] E.F. im Thurn, Among the Indians of Guiana, pp. 167-171, 202-207. London, 1883. [214] W.Z. Ripley, Races of Europe, p. 237. New York, 1899. [215] _Ibid._, p. 469. [216] H. Barth, Human Society in Northern Central Africa, _Journal of the Royal Geog. Society_, Vol. XXX, p. 116. London, 1860. [217] Moritz Wagner, _Die Entstehung der Arten durch raeumliche Sonderung_. Basel, 1889. [218] H.W. Conn, The Method of Evolution, pp. 282-295. New York, 1900. [219] McGee and Thomas, Prehistoric North America, pp. 418, 424, Vol. XIX of _History of North America_. Philadelphia, 1905. [220] Ratzel, History of Mankind, Vol. II, pp. 280-283. London, 1896-1898. [221] Caesar, _Bella Gallico_, Book II, chap. IV. [222] H. Helmolt, History of the World, Vol. VI, pp. 32-33. New York, 1902-1906. [223] Hodgkin, Italy and Her Invaders, Vol. I, Part I, pp. 75, 81, 82. Oxford, 1895. [224] W.Z. Ripley, Races of Europe, pp. 34, 341-342. New York, 1899. [225] H. Helmolt, History of the World, Vol. III, pp. 400, 417, New York, 1902-1906. [226] A.C. Haddon, The Study of Man, p. xix. New York and London, 1898. [227] James Bryce, Migrations of the Races of Men Considered Historically, _Scottish Geographical Magazine_, Vol. VIII, pp. 400-421. May, 1892. [228] Eleventh Census, _Report on the Indians_, pp. 34-35. Washington, 1894. [229] H. Helmolt, History of the World, Vol. III, p. 42. New York, 1902-1906. [230] Ratzel, History of Mankind, Vol. II, pp. 279-283, London, 1896-98. [231] Jerome Dowd, The Negro Races, Vol. I, pp. 47-48, 61-62. New York, 1907.