Claudine Cohen is professor of the history of science at the Ecole des hautes etudes en sciences sociales, Paris, and the author of The Fate of the Mammoth: Fossils, Myth, and History, also published by the University of Chicago Press. Andre Wakefield is associate professor of history at Pitzer College in Claremont, California, and the author of The Disordered Police State: German Cameralism as Science and Practice, also recently published by the University of Chicago Press.