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The article highlights a report discussing the pleistocene climatic changes and the distribution of life in East Africa. It reports that the present evergreen forest boundaries are generally not natural, noting that they have been reduced by human agency as much as they would have been appreciable drop in rainfall. It discusses the changes that have occurred in the West African forest for a period prior to 400,000 thousand years ago. It also examines the impact of the subsequent dry period in the areas including Elgon, Kilimanjaro, and the highland forms in Southern Tanganyika Territory.

Examines runoff and soil moisture in the desert conditions of Arizona. Influence of rainfall on physiographic processes; Facts about the rainfall of the Tucson region in Arizona; Data on the average annual rainfall; Distribution of precipitation; Implications of the irregularity of rainfall in southern Arizona; Occurrence of drought; Determinants to the amount of runoff.