IN WHAT SENSE DOES PLATO SAY, THAT THE ANTIPERISTASIS (OR REACTION) OF MOTION—BY REASON THERE IS NO VACUUM—IS THE CAUSE OF THE EFFECTS IN PHYSICIANS’ CUPPING-GLASSES, IN SWALLOWING, IN THROWING OF WEIGHTS, IN THE RUNNING OF WATER, IN THUNDER, IN THE ATTRACTION OF THE LOADSTONE, AND IN THE HARMONY OF SOUNDS? See Timaeus , pp. 79-81. For it seems unreasonable to ascribe the reason of such different effects to the selfsame cause.