Know'st one Pythagoras, long-haired Pythagoras, The far-fam'd boxer of the Samians ? I am Pythagoras ; ask the I'.lians What were my feats, thou'lt not believe the tale. Favorinus says that our philosopher used definitions throughout the subject matter of mathematics ; their use was extended by Socrates and his disciples, and afterwards by Aristotle and the Stoics. Further, Ave are told that he was the first to call the heaven the universe and the earth spherical, though Theophrastus says it was Parmenides, and Zeno that it was Hesiod. It is said that Cylon was a rival of Pythagoras, as Antilochus b was of Socrates. Pythagoras the athlete was also the subject of another epigram as follows c : Gone to box with other lads Is the lad Pythagoras, Gone to the games Olympian Crates' son the Samian. The philosopher also wrote the following letter : Pythagoras to Anaximenes. " Even you, O most excellent of men, were you no better born and famed than Pythagoras, would have risen and departed from Miletus. But now your ancestral glory has detained you as it had detained me were I Anaximenes's peer. But if you, the best men, abandon your cities, then will their good order perish, and the peril from the Medes will increase. For always to scan the heavens is not well, but more seemly is it to be provident for one's 12, 47, ix. 23, 34), it seems likely that he is our author's authority here ; so probably a different book of Favorinus is cited. b Apelt suggests Antiphon, comparing Xen. Mem. i. 6.