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

[107] Roscher, _Grundlagen des National-Oekonomik_, Book VI.
_Bevölkerung_, 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.