This addition to the growing literature on geopolitics is more objective than most interpretations that have already appeared, and is particularly useful for its numerous quotations from, and references to, the works of the principal geopolitical writers. A number of maps are reproduced to illustrate cartographic devices by which the adepts of German geopolitics seek to facilitate acceptance of their arguments. The author was assisted by Professors C. C. Colby and Richard S. Hartshorne.