After reviewing the anthropological background of this worldview-the Greeks and the Enlightenment-Morris explores two essential themes. First, he critically assesses the main forms of dialectical naturalism, including Darwin's evolutionary theory, Marx's historical materialism, and the hylorealism of the philosopher-scientist Mario Bunge. Second, he offers a strong plea to retain the dual heritage of anthropology as a historical science that combines both humanism and naturalism. A powerful philosophical manifesto, the book cogently upholds dialectical naturalism as the most grounding philosophy for anthropology and the social sciences.