 Locke’s third argument rests on the Scholastic’s assumption that nature produces many things alike. The natural production of physically similar entities, however, is a double-edged sword. Nature not only produces similarities among objects, but it produces far too many similarities. That is, among the vast array of similar qualities that objects share we must select those few which we take to be important enough to constitute the meaning of the general term and thereby constitute the species or genus. This selection process is not something that nature can do, only we can decide which qualities are important enough to count as part of the definition of a species or genus.