In short, throughout the Classical age, life was the province of an ontology which dealt in the same way with all material beings, all of which were subject to extension, weight, and movement; and it was in this sense that all the sciences of nature, and especially that of living beings, had a profound mechanistic vocation; from Cuvier onward, living beings escape, in the first instance at least, the general laws of extensive being; biological being becomes regional and autonomous; life, on the confines of being, is what is exterior to it and also, at the same time, what manifests itself within it.