pythagoras was the first philosopher that called the world [greek omitted], from the order and beauty of it; for so that word signifies. thales and his followers say the world is one. democritus, epicurus, and their scholar metrodorus affirm that there are infinite worlds in an infinite space, for that infinite vacuum in its whole extent contains them. empedocles, that the circle which the sun makes in its motion circumscribes the world, and that circle is the utmost bound of the world. seleucus, that the world knows no limits. diogenes, that the universe is infinite, but this world is finite. the stoics make a difference between that which is called the universe, and that which is called the whole world; — the universe is the infinite space considered with the vacuum, the vacuity being removed gives the right conception of the world; so that the universe and the world are not the same thing.