Stuttgart, 1888.

[30] Captain A.T. Mahan, Influence of Sea Power upon History, pp. 41-42,
50-53. Boston, 1902.

[31] H. Bancroft, History of California, Vol. I, pp. 298, 628-635. San
Francisco.

[32] Agnes Laut, Vikings of the Pacific, pp. 64-82. New York, 1905.

[33] Bunbury, History of Ancient Geography, Vol. II, pp. 351, 470-471.
London, 1883.




CHAPTER II

CLASSES OF GEOGRAPHIC INFLUENCES


Into almost every anthropo-geographical problem the element of
environment enters in different phases, with different modes of
operation and varying degrees of importance. Since the causal conception
of geography demands a detailed analysis of all the relations between
environment and human development, it is advisable to distinguish the
various classes of geographic influences.

[Sidenote: Physical effects.]