Since the second half of the 18th century, two major scientific communities developed around a specific language: on the one hand, experimentalism, which used the vocabulary of method and the discourse of experience and expressed itself in vernacular languages; and on the other hand, Latin systematics, which developed a controlled vocabulary and began to formalize the rules for producing its statements. The two languages, originally focused on experimentation and nomenclature respectively, gradually merged towards the end of the century to form the new naturalistic language that would become the basis for the new biology of the 19th century. The paper deals with microhistorical version of that story. At that time, in the context of Genevan science, it was the work of the surgeon and naturalist Louis Jurine that re-enacted this great mutation of the scientific language of learned Europe.