[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.