[131] Strabo, Book II, chap. III, 7.

[132] McGee and Thomas, Prehistoric North America, pp. 408-414, Vol. XIX
of _History of North America_, edited by T.N. Thorpe. Philadelphia,
1905.

[133] Hodgkin, Italy and Her Invaders, Vol. II, p. 214. Oxford, 1892.

[134] Sir John Lubbock, Prehistoric Times, p. 587. New York, 1872.

[135] D.G. Brinton, The American Race, pp. 116-119. Philadelphia, 1901.

[136] O.T. Mason, Primitive Travel and Transportation, pp. 249-250.
_Smithsonian Report_, Washington, 1896.

[137] Thucydides, Book I, chap. II.

[138] Edward A. Boss, Foundations of Sociology, pp. 359-363, 386-389.
New York, 1905.

[139] D.G. Brinton, Races and Peoples, pp. 73-75. Philadelphia, 1901.

[140] John Richard Green, The Making of England, Vol. I, pp. 9-11,
45-46, 52-54, 57, 62. London, 1904.

[141] James Bryce, The Migration of the Races of Men Considered
Historically, _Scottish Geographical Magazine_, Vol. VIII, pp. 400-421,
and _Smithsonian Report_ for 1893, pp. 567-588.

[142] Cæsar, _De Bello Gallico_, Book II, chap. 29.