Abstract

I argue that Locke’s various descriptions of real essence pick out one and the same thing, namely a nature that can be ascribed to many things, and in terms of which we can get matters of classification right or wrong. On my reading, Locke does not attack real essences of the sort that are the essences of real species, but rather the presumption that a sorting according to our species concepts and their names is a sorting of things according to their real essences. And the lesson of Locke’s empirical argument against that presumption, I argue, is that our species concepts often function more like higher taxa, grouping together things that knowledge of their real essences would distinguish into distinct lowest species.