Note (return) — Chapter VIII
Reading edition
Leucippus of Miletus (B.C. 500-400) appears, in the order of speculation, as the successor of Anaximander. Atoms and space are, in his philosophy, the ἀρχαί, or first principles of all things. "Leucippus (and his companion, Democritus) assert that the plenum and the vacuum [i.e., body and space] are the first principles, whereof one is the Ens, the other Non-ens; the differences of the body, which are only figure, order, and position, are the causes of all others." 422