not so by nature, but only by law. And his reasoning proceeds in this way. He says, that water being melted by heat, when it is submitted to the action of fire, by which it is solidified, becomes earth; and when it is liquefied, becomes air. And, therefore, the earth is surrounded by air and influenced by it, and so is the air by the revolutions of fire. And he says that animals are generated out of hot earth, which sends up a thick mud something like milk for their food. So too he says that it produced men.
And he was the first person who said that sound is produced by the percussion of the air; and that the sea is filtered in the hollows of the earth in its passage, and so is condensed; and that the sun is the greatest of the stars, and that the universe is boundless.
IV. But there were three other people of the