This is the first detailed account of the emergence of sociology and related social sciences in France. It emphasizes three social and intellectual groupings in the period from 1880 to 1914: the social statisticians who grew out of governmental ministries, the Durkheimians who were consistently housed in the university, and the "international sociologists" around René Worms, in neither ministries nor the university. Unlike most histories of ideas, it portrays the institutional developments that encouraged, discouraged, and rechanneled different styles of research.