The classical origins of nineteenth-century social theory are illuminated in this sequel to the award-winning Classical Horizons: The Origins of Sociology in Ancient Greece. George E. McCarthy stresses the importance of Aristotle and Kant in the creation of a new type of social science in the nineteenth century that represented a critical reaction to Enlightenment rationality and modern liberalism. The seminal social theorists Marx, Durkheim, and Weber integrated Aristotle's theory of moral economy and practical wisdom (phronesis) with Kant's theory of knowledge and moral autonomy. The resulting social theories, uniquely supported by a view of practical science that wove together science and ethics, proved instrumental to the development of modern sociology and anthropology.