of that thing which is beyond the world, and whether it be a vacuum or not.

pythagoras and his followers say that beyond the world there is a vacuum, into which and out of which the world hath its respiration. the stoics, that there is a vacuum into which infinite space by a conflagration shall be dissolved. posidonius, not an infinite vacuum, but as much as suffices for the dissolution of the world; and this he asserts in his first book concerning the vacuum. aristotle affirms, that a vacuum does not exist. plato concludes that neither within nor without the world there is any vacuum.