287. So all beings breathe in and out; all have bloodless tubes of flesh spread over the outside of the body, and at the openings of these the outer layers of skin are pierced all over with close-set ducts, so that the blood remains within, while a facile opening is cut for the air to pass through. Then whenever the soft blood speeds away from these, the air speeds bubbling in with impetuous wave, and whenever the blood leaps back the air is breathed out; as when a girl, playing with a klepsydra of shining brass, takes in her fair hand the narrow opening of the tube and dips it in the soft mass of silvery water, the water does not at once flow into the vessel, but the body of air within pressing on the close-set holes checks it till she uncovers the compressed stream; but then when the air gives way the determined amount of water enters. (302.) And so in the same way when the water occupies the depths of the bronze vessel, as long as the narrow opening and passage is blocked up by human flesh, the air outside striving eagerly to enter holds back the water inside behind the gates of the resounding tube, keeping control of its end, until she lets go with her hand. (306.) Then, on the other hand, the very opposite takes place to what happened before; the determined amount of water runs off as the air enters. Thus in the same way when the soft blood, surging violently through the members, rushes back into the interior, a swift stream of air comes in with hurrying wave, and whenever it (the blood) leaps back, the air is breathed out again in equal quantity. 313. With its nostrils seeking out the fragments of animals’ limbs, <as many as the delicate exhalation from their feet was leaving behind in the wood.> 314. So, then, all things have obtained their share of breathing and of smelling. 315. (The ear) an offshoot of flesh. 316. And as when one with a journey through a stormy night in prospect provides himself with a lamp and lights it at the bright-shining fire—with lanterns that drive back every sort of wind, for they scatter the breath of the winds as they blow—and the light darting out, inasmuch as it is finer (than the winds), shines across the threshold with untiring rays; so then elemental fire, shut up in membranes, it entraps in fine coverings to be the round pupil, and the coverings protect it against the deep water which flows about it, but the fire darting forth, inasmuch as it is finer.... 326. There is one vision coming from both (eyes). 327. (The heart) lies in seas of blood which darts in opposite directions, and there most of all intelligence centres for men; for blood about the heart is intelligence in the case of men. 330. For men’s wisdom increases with reference to what lies before them. 331. In so far as they change and become different, to this extent other sorts of things are ever present for them to think about.