Abstract
THE Human period of the Quaternary era has set in. Disregarding epochs of the Pleistocene or of earlier periods in which man has left traces of his existence, his activity may be said to have begun when a clear field was given for migration. His rule on the earth's surface was assured by the disappearance of continental glaciation from the temperate zones. Henceforward, he began seriously to modify the earth. The improvement of the entrance to a cave was probably his first essay in denudation; the building of a barricade against wild beasts foreshadowed the vast works of transport and accumulation that are traceable in the Pyramids or in Cuzco. Man as a Geological Agent: An Account of His Actions on Inanimate Nature. By Dr. R. L. Sherlock. Pp. 372. (London: H. F. and G. Witherby, 1922.) 20s. net.
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