Values and social science; the value dispute in perspective.--Homo sociologicus; on the history, significance, and limits of the category of social role. --Sociology and human nature; a postscript to Homo sociologicus.--Out of Utopia; toward a reorientation of sociological analysis.--In praise of Thrasymachus.--On the origin of inequality among men.--Liberty and equality; reflections of a sociologist on a classical theme of politics.--Market and plan; two types of rationality. --Uncertainty, science, and democracy.--Sociology and the sociologist; on the problem of theory and practice.