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. How respiration is made by the reaction of the air, he has sufficiently shown. But the rest, he says, seem to be done miraculously, but really the bodies thrust each other aside and change places with one another; while he has left for us to determine how each is particularly done.