Hippo; His Duality of Principles; His Psychology.

Hippo, a native of Rhegium, asserted as originating principles, coldness, for instance water, and heat, for instance fire. And that fire, when produced by water, subdued the power of its generator, and formed the world. And the soul, he said, is sometimes brain, but sometimes water; for that also the seed is that which appears to us to arise out of moisture, from which, he says, the soul is produced.

Ref 1.16.1

So far, then, we think we have sufficiently adduced (the opinions of) these; wherefore, inasmuch as we have adequately gone in review through the tenets of physical speculators, it seems to remain that we now turn to Socrates and Plato, who gave especial preference to moral philosophy.

Ref 1.16.2