[95] Ibid., p. 27.

[96] Albert Niblack, The Coast Indians of Southern Alaska and Northern British Columbia, pp. 298-299, 304, 337-339.  Washington, 1888.

[97] Ratzel, History of Mankind, Vol.  III, p. 173.  London, 1896-1898.

[98] Ibid., Vol.  III. pp. 173-174.

[99] Sven Hedin, Central Asia and Tibet, Vol.  I, p. 184.  New York and London, 1903.

[100] John de Plano Carpini, Journey in 1246, p. 130. Hakluyt Society, London, 1904.

[101] Journey of William de Rubruquis in 1253, p. 188. Hakluyt Society, London, 1903.

[102] Volney, quoted in Malthus, Principles of Population, Chap.  VII, p. 60.  London, 1878.

[103] Genesis, Chap.  XIII, 1-12.

[104] Herbert Spencer, Principles of Sociology, Vol.  I. p. 457.  New York.

[105] Heinrich von Treitschke, Politik, Vol.  I, pp. 202-204.  Leipzig, 1897.

[106] E.C.  Semple, American History and Its Geographic Conditions, pp. 206-207.  Boston, 1903.

[107] Roscher, Grundlagen des National-Oekonomik, Book VI. Bevoelkerung, p. 694, Note 5.  Stuttgart, 1886.

[108] Edward John Payne, History of the New World Called America, Vol.  I, p. 303-313.  Oxford and New York, 1892.

[109] Roscher, National-Oekonomik des Ackerbaues, pp. 31, 52.  Stuttgart, 1888.

[110] Ibid., p. 56, Note 5.

[111] For these and other averages, Sir John Lubbock, Prehistoric Times, pp. 593-595.  New York, 1872.

[112] Roscher, National-Oekonomik des Ackerbaues, pp. 79-80, p. 81, Note 7.  Stuttgart, 1888.  William I. Thomas, Source Book for Social Origins, pp. 96-112.  Chicago, 1909.

[113] Capt.  J. Forsyth, The Highlands of Central India, pp. 101-107, 168.  London, 1889.

[114] Tacitus, Germania, III.

[115] Roscher, National-Oekonomik des Ackerbaues, p. 32, Note 15 on p. 36.  Stuttgart, 1888.

[116] E. Huntington, The Pulse of Asia, pp. 202, 203, 212, 213, 236-237.  Boston, 1907.

[117] Sheldon Jackson, Introduction of Domesticated Reindeer into Alaska, pp. 20, 25-29, 127-129.  Washington, 1894.

[118] Quoted in Alexander von Humboldt, Aspects of Nature in Different Lands, pp. 62, 139.  Philadelphia, 1849.

[119] Edward John Payne, History of the New World Called America, Vol.  I, pp. 311-321. 333-354, 364-366.  New York, 1892.

[120] Prescott, Conquest of Peru, Vol.  I, p. 47.  New York, 1848.

[121] McGee and Thomas, Prehistoric North America, Vol.  XIX, pp. 151-161, of The History of North America, edited by Francis W. Thorpe, Philadelphia, 1905.

[122] Ratzel, Anthropo-geographie, Vol.  II, pp. 264-265.

[123] Malthus, Principles of Population, Chapters V and VII.  London, 1878.

[124] Nathaniel Shaler, Nature and Man in America, pp. 147-151.  W.Z.  Ripley, Races of Europe, Chap.  I, New York, 1899.