Book Review | Published:


Nature volume 142, page 662 (08 October 1938) | Download Citation



IN this excellent and well-illustrated book the author covers the whole field of his subject by treating the phenomena, not as isolated processes, but as stages in two continuous series, “in each of which there is every transition from moving masses of dry rock and soil at one extreme to masses of rock and soil abundantly impregnated with Water or ice at the opposite end of the sequence”. The movements themselves are distinguished as flow (continuous deformation) and slip (mass movement along a plane separating the moving mass from the stable ground), and each type is further subdivided in terms of rate of movement. The classification thus arrived at is by far the best yet proposed, and has the great advantage of clearly relating the co-operating processes and resulting forms to those of the recognized geomorphic cycles.

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