Influences of Geographic Environment / On the Basis of Ratzel's System of Anthropo-Geography

by Ellen Churchill Semple

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

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

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

Roscher, Grundlagen des National-Oekonomik, Book VI. Bevölkerung, p. 694, Note 5. Stuttgart, 1886.

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

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

Ibid., p. 56, Note 5.

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

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.

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