IV. He asserted that the sun was a mass of burning iron, greater than Peloponnesus; (that some attribute this doctrine to Tantalus), and that the moon contained houses, and also, hills and ravines: and that the primary elements of everything were similarities of parts; for as we say that gold consists of a quantity of grains combined together, so too is the universe formed of a number of small bodies of similar parts. He further taught that Mind was the principle of motion: and that of bodies the heavy ones, such as the earth, occupied the lower situations; and the light ones, such as fire, occupied the higher places, and that the middle spaces were assigned to water and air. And thus that the sea rested upon the earth, which was broad, the moisture being all evaporated by the sun. And he said that the stars originally moved about in irregular confusion, so that at first the pole star, which is continually visible, always appeared in the zenith, but that afterwards it acquired a certain declination. And that the milky way was a reflection of the light of the sun when the stars did not appear. The comets he considered to be a concourse of planets emitting rays: and the shooting stars he thought were sparks as it were leaping from the firmament. The winds he thought were caused by the rarification of the atmosphere, which was produced by the sun. Thunder, he said, was produced by the collision of the clouds; and lightning by the rubbing together of the clouds. Earthquakes, he said, were produced by the return of the air into the earth. All animals he considered were originally generated out of moisture, and heat, and earthy particles: and subsequently from one another. And males he considered were derived from those on the right hand, and females from those on the left. V. They say, also, that he predicted a fall of the stones which fell near Ægospotami, and which he said would fall from the sun: on which account Euripides, who was a disciple of his, said in his Phaethon that the sun was a golden clod of earth. He went once to Olympia wrapped in a leathern cloak as if it were going to rain; and it did rain. And they say that he once replied to a man who asked him whether the mountains at Lampsacus would ever become sea, “Yes, if time lasts long enough.” VI. Being once asked for what end he had been born, he said, “For the contemplation of the sun, and moon, and heaven.” A man once said to him, “You have lost the Athenians;” “No,” said he, “they have lost me.” When he beheld the tomb of Mausolus, he said, “A costly tomb is an image of a petrified estate.” And he comforted a man who was grieving because he was dying in a foreign land, by telling him, “The descent to hell is the same from every place.”