AbstractThe question of social medicine provides the opportunity to engage in a critical reading of Foucault's theory of biopower. The analyses dedicated by Foucault to ‘the birth of social medicine’ represent one of the few examples of a thorough application of that theory. They allow Foucault to show the heuristic value of the biopolitical hypothesis at the level of the most concrete historical materiality, and not just at that of the general history of the forms of governmentality. These analyses, however, also allow the historiographical and political limits of the biopolitical hypothesis to come to light. From the perspective of the history of sciences as well as from that of the analysis of the modalities of social critique in the first half of the nineteenth century, Foucault appears to provide an interpretation that is too continuist and tends to homogenise the historical phenomena. The disqualification of social medicine relies in part on simplifications that continue to bear great significance t...