The goal of the article is to explore the unity of the so-called “Geneva School” employing three elements provided by Bachelard: theories, objects and methods. The extent of the Saussurean linguistic thought is glimpsed in his “successors” in the University of Geneva. I will recall the linguistic theories of Bally, Frei and Sechehaye, and I will propose two perspectives: first, the theoretical relation of each of them with Saussure; second, the place of their linguistics among the other sciences whose object is language