Dr. Arendt derives modern totalitarianism from three currents--anti-Semitism, overseas imperialism with its undermining of the nation-state, and tribal nationalism. The result of her studies is a provocative and difficult book. Some of her historical generalizations are questionable and too much of her interpretation is taken from the particular experience of Germany. But the book abounds in challenging insights which some readers will find stimulating, and others highly irritating.