Full Idea
Any water is said to be specifically the same as any other water because it has a certain similarity to it.
Gist of Idea
All water is the same, because of a certain similarity
Source
Aristotle (Topics [c.331 BCE], 103a20)
Book Reference
Aristotle: 'Posterior Analytics and Topica', ed/tr. Tredennick,H/Forster,ES [Harvard 1960], p.289
A Reaction
(Cf. Idea 8153) It take this to be the hallmark of a natural kind, and we should not lose sight of it in the midst of discussions about rigid designation and essential identity. Tigers are only a natural kind insofar as they are indistinguishable.
Related Idea
Idea 8153 By knowing one piece of clay or gold, you know all of clay or gold [Anon (Upan)]