Lamarck's perspective on change within the organic world, in particular his conception of “la marche de la nature,” (‘transformism’, ‘evolution’), crystallized during the last decade of the 18th century and the early years of the 19th. I argue that it should be viewed as resulting in part from interactions with, and transfers from, the social thought—modes of thinking, ways of conceptualizing, models, metaphors and analogies—of the decades before the French revolution and of the revolutionary decade itself. Moreover, Lamarck's involvement with the new institutional frameworks initiated during the revolutionary period had brought him into direct contacts with the then prevalent modes of discourse on things social.

The transfer of modes of thought, concepts, models, and metaphors from Darwinian and Lamarckian evolutionary biology played a significant role in the mergence, constitution, and legitimization of sociology as an autonomous discipline in France at the end of the nineteenth century. More specifically, the Durkheimian group then came to be recognized as “French sociology.” In the present paper, I analyze a facet of the struggle among various groups for this coveted status and demonstrate that the initial adherence to and subsequent abandonment of “the biological” played an important, but complex, role in the outcome of that struggle. Furthermore, the choice of biological model, whether Darwinian or Lamarckian, had repercussions on one's position in that cultural field. The outcome of the “battle” between René Worms' group that supported and contributed to the Revue Internationale de Sociologie (RIS) on the one hand, and Emile Durkheim's group and those committed to the L'Année Sociologique (AS) on the other—from which the Durkheimians emerged victorious—was due not only to internal scientific factors, but also to a particular juxtaposition of developments within sociology and anthropology and their relation to and interaction with French culture and politics at large.