 I would not here be thought to forget, much less to deny, that Nature in the Production of Things, makes several of them alike: there is nothing more obvious, especially in the Races of Animals, and all Things propagated by Seed. But yet, I think, we may say, the sorting of them under Names, is the Workmanship of the Understanding, taking occasion from the similitude it observes amongst them, to make abstract general Ideas, and set them up in the mind, with Names annexed to them, as Patterns, or Forms, (for in that sense the word Form has a very proper signification,) to which, as particular Things existing are found to agree, so they come to be of that Species, have that Denomination, or are put into that Classis. (III.iii.13)