In Britain and America almost all the interest Of anthropologists is concentrated on cultural problems. Roland Dixon's book published in 1923, is one Of the few volumes in English which deals with the same problems as my own thesis. But in Germany there has been much more activity of late years. The new Zeitschrift fur Rassen kunde (with which the writer is associated as Joint Editor) is largely concerned with problems Of race classification. The authoritative work of Baron von Eickstedt, Rassenkunde und Rassengeschichte (stuttgart, studies racial differentiation in much the same fashion as Environment and Race, and comes to many Of the same conclusions. In America, while the anthropologists have not shown much concern with race evolution, journals like Human Biology and Ecology have been more hospitable to the new attack on human problems, based on ecological principles, with which I am concerned.