XXI. Upon the Athenians the effect of these various philosophers was already marked and influential. From the time of Solon there had existed in Athens a kind of school of political philosophy [246]. But it was not a school of refining dogmas or systematic ethics; it was too much connected with daily and practical life to foster to any great extent the abstract contemplations and recondite theories of metaphysical discoveries. Mnesiphilus, the most eminent of these immediate successors of Solon, was the instructor of Themistocles, the very antipodes of rhetoricians and refiners. But now a new age of philosophy was at hand. Already the Eleatic sages, Zeno and Parmenides, had travelled to Athens, and there proclaimed their doctrines, and Zeno numbered among his listeners and disciples the youthful Pericles. But a far more sensible influence was exercised by Anaxagoras of the Ionian school. For thirty years, viz., from B. C. 480 to B. C. 450, during that eventful and stirring period intervening between the battle of Thermopylae and the commencement of the five years' truce with Sparta, followed by the death of Cimon (B. C. 449), this eminent and most accomplished reasoner resided in Athens [247]. His doctrines were those most cherished by Pericles, who ranked the philosopher among his intimate friends. After an absence of some years, he again returned to Athens; and we shall then find him subjected to a prosecution in which religious prejudice was stimulated by party feud. More addicted to physics than to metaphysical research, he alarmed the national superstition by explaining on physical principles the formation even of the celestial bodies. According to him, the sun itself--that centre of divine perfection with the Pythagoreans--was ejected from the earth and heated into fire by rapid motion. He maintained that the proper study of man was the contemplation of nature and the heavens [248]: and he refined the Author of the universe into an intellectual principle (Nous), which went to the root of the material causes mostly favoured by his predecessors and contemporaries. He admitted the existence of matter, but INTELLIGENCE was the animating and prevailing principle, creating symmetry from chaos, imposing limit and law on all things, and inspiring life, and sensation, and perception. His predecessors in the Ionian school, who left the universe full of gods, had not openly attacked the popular mythology. But the assertion of One Intelligence, and the reduction of all else to material and physical causes, could not but have breathed a spirit wholly inimical to the numerous and active deities of Hellenic worship. Party feeling against his friend and patron Pericles ultimately drew the general suspicion into a focus; and Anaxagoras was compelled to quit Athens, and passed the remainder of his days at Lampsacus. But his influence survived his exile. His pupil Archelaus was the first _native