Although this book opens with a map of the world showing the continents divided into 10 morphoclimatic regions, this is not simply a text book on geomorphology organized climatically. Rather it is a dissertation which attempts to provide an explanation for the morphology of the earth. L. C. King had the same ambition, as had W. Penck and, more diffidently, W. M. Davis. One may continue to be impressed by the clarity and visual attractiveness of Davis's exposition, though dissatisfied with the integration of its elements; W. Penck's ideas, notably his mechanism for piedmont stairway development, are more difficult to appreciate; King's explanation of upland plains in terms of scarp retreat over immense distances as the result of uplift generated by the disruption of the continents fails to convince most geomorphologists.
A basic problem to be solved is the means by which the land surface is lowered to produce extensive plains developed on solid rock, which may then be dissected, with the preservation of extensive fragments apparently little modified.