[41] T. Waitz, Anthropology, pp. 57-58. Edited by J.F. Collingwood. London, 1863. [42] Schoolcraft, Indian Tribes of the United States, Vol. I, pp. 198-200, 219. Philadelphia, 1853. [43] Darwin, Descent of Man, p. 33. New York, 1899. [44] D. Livingstone, Missionary Travels, p. 266. New York, 1858. [45] Alaska, _Eleventh Census Report_, pp. 54, 56. Washington, 1893, and Albert P. Niblack, The Coast Indians of Southern Alaska and Northern British Columbia, p. 237. Washington, 1888. [46] Fitz-Roy, Voyage of the Beagle, Vol. II, pp. 130-132, 137, 138. London, 1839. [47] H. Bancroft, Native Races, Vol. I, pp. 88-89. San Francisco, 1886. [48] S. Stanhope Smith, Essay on the Causes of the Variety of Complexion and Figure in the Human Species, pp. 103-110. New Brunswick and New York, 1810. [49] For full discussion see A.R. Wallace's article on acclimatization in Encyclopedia Britanica, and W.Z. Ripley, Races of Europe. Chap. XXI. New York, 1899. [50] D.G. Brinton, Races and Peoples, pp. 39-41. Philadelphia, 1901. [51] Darwin, Descent of Man, pp. 34-35. New York, 1899. [52] E.F. Knight, Where Three Empires Meet, pp. 137-138. London, 1897. [53] W.Z. Ripley, Races of Europe, pp. 58-71, Map. New York, 1898. [54] _Ibid._, p. 566. D.G. Brinton, Races and Peoples, pp. 29-30. Philadelphia, 1901. [55] D. Livingstone, Missionary Travels, p. 607. New York, 1858. [56] Williams and Calvert, Fiji and the Fijians, p. 83, New York, 1859. [57] P. Ehrenreich, _Die Urbewohner Brasiliens_, p. 32. Braunschweig, 1897. [58] T. Waitz, Anthropology, pp. 46-49. Edited by Collingwood, London, 1863. [59] _Philippine Census_, Vol. I, p. 552. Washington, 1903. [60] F. Ratzel, History of Mankind, Vol. III, p. 106. London, 1908. [61] Major Charles E. Woodruff, The Effect of Tropical Light on the White Man, New York, 1905, is a suggestive but not convincing discussion of the theory. [62] W.Z. Ripley, Races of Europe, pp. 74-77. New York, 1899. [63] Quoted in G. Sergi, The Mediterranean Race, p. 73. London and New York, 1901. [64] _Ibid._, pp. 63-69, 74-75. [65] T. Waitz, Anthropology, pp. 44-45. Edited by J.F. Collingwood, London, 1863. [66] W.Z. Ripley, Races of Europe, p. 76. New York, 1899. [67] For able discussion, see Topinard, Anthropology, pp. 385-392. Tr. from French, London, 1894. [68] J. Johnson, Jurisprudence of the Isle of Man, pp. 44, 71. Edinburgh, 1811. [69] Charles F. Hall, Arctic Researches and Life among the Eskimo, p. 571. New York, 1866. Franz Boas, The Central Eskimo, _Sixth Annual Report of the Bureau of Ethnology_, pp. 588-590. Washington, 1888. [70] Ratzel, History of Mankind, Vol. I, p. 35. London, 1896-1898. [71] Roscher, _National-Oekonomik des Ackerbaues_, p. 34, note 8. Stuttgart, 1888. [72] Elisee Reclus, The Earth and Its Inhabitants, _Asia_, Vol. I, p. 171. New York, 1895. [73] Alfred Hettner, _Die Geographie des Menschen_, pp. 409-410 in _Geographische Zeitschrift_, Vol. XIII, No. 8. Leipzig, 1907.