writings of Parmenides; and his successors were called the philosophers of the Megaric school; after that they were called the Contentious school, and still later, the Dialecticians, which name was first given to them by Dionysius the Carthaginian; because they carried on their investigations by question and answer. Hermodorus says that after the death of Socrates, Plato and the other philosophers came to Euclides, because they feared the cruelty of the tyrants.
II. He used to teach that the chief good is unity; but that it is known by several names; for at one time people call it prudence; at another time God; at another time intellect, and so on. But everything which was contrary to good, he discarded, denying its existence. And the proofs which he used to bring forward to support his arguments, were not those which proceed on assumptions, but on conclusions. He also rejected all that sort of reasoning which proceeds on comparison, saying that it