This essay traces the connected histories of Portuguese and French anthropology in the late nineteenth century. By looking at a Portuguese scientific institution, the Carlos Ribeiro Society, it considers how French race science, known as anthropologie, was adopted and adapted across the European Latin world as a type of “stranger-science.” That is: as an authoritative outsider scientific formation, installed into national terrain in accordance with insider strategies for turning foreign elements into native forms of scientific sovereignty and modernity. French anthropology’s (...) international diffusion becomes meaningful in the light of the Portuguese incorporating what was foreign and modern as a means to generate vitality, and authority endogenously in their own national context. Hence, addressing the circulation of stranger-sciences can pave the way for an original conceptualizing of the transnational life of race science across and even beyond the Latin world. (shrink)