changes in the universe take to complete and that the All is limited and ever in motion. According to Demetrius in his work on Men of the Same Name, he left nothing in writing. There were two men named Hippasus, one being our subject, and the other a man who wrote The Laconian Constitution in five books ; and he himself was a Lacedaemonian. Chapter 7. PHILOLAUS (Perhaps late fifth century) Philolaus of Croton was a Pythagorean, and it was from him that Plato requests Dion to buy the Pythagorean treatises. He (Dion) was put to death because he was thought to be aiming at a tyranny. 6 This is what we have written upon him c : Fancies of all things are most flattering ; If you intend, but do not, you are lost. So Croton taught Philolaus to his cost, Who fancied he would like to be their king.'* His doctrine is that all things are brought about by necessity and in harmonious inter-relation. He was the first to declare that the earth moves in a circle, e though some say that it was Hicetas of Syracuse. He wrote one book, and it was this work which, according to Hermippus, some writer said that Plato the philosopher, when he went to Sicily to Dionysius's court, bought from Philolaus's relatives