Single Idea 12265

[catalogued under 26. Natural Theory / B. Natural Kinds / 2. Defining Kinds]

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


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)]