Full Idea
Artificial things are of distinct species, as well as natural. ..For why should we not think a watch and a pistol as distinct species one from another, as a horse and a dog?
Gist of Idea
Artificial things like watches and pistols have distinct kinds
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 3.06.41)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.465
A Reaction
This is the beginning of a topic which has caused a lot of modern debate in trying to assess essentialist claims.