Abstract
This brief work valuably shows how a distinguished historian ascertains the causes of his historical facts. Koht, a Norwegian European historian, eschews any philosophy of history, claiming only that the nature of man is permanent through historical change. Drawing from his own historical research he discusses the significance of the different forces of history. These are religion, economics, class consciousness, the power of the state, war, revolt, science, and internationalism. No one force or cause is primary.—A. B. D.