Diogenes of Apollonia (fl. 425 BC) was an ancient Greek philosopher, and was a native of the Milesian colony Apollonia in Thrace. He lived for some time in Athens. His doctrines are known chiefly from Diogenes Laërtius and Simplicius. He believed air to be the one source of all being, and, as a primal force, it was intelligent. All other substances are derived from it by condensation and rarefaction. Aristotle has preserved a lengthy passage concerning the organization of the blood vessels.
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“Why not whip the teacher when the pupil misbehaves?”
—Diogenes of Sinope (c. 410–320 B.C.)