Thus[565] do all things draw breath and breathe it out again. All have bloodless tubes of flesh extended over the surface of their bodies; and at the mouths of these the outermost surface of the skin is perforated all over with pores closely packed together, so as to keep in the blood while a free <<5>> passage is cut for the air to pass through. Then, when the thin blood recedes from these, the bubbling air rushes in with an impetuous surge; and when the blood runs back it is breathed out again. Just as when a girl, playing with a water-clock of shining brass, puts the orifice of the pipe upon <<10>> her comely hand, and dips the water-clock into the yielding mass of silvery water,—the stream does not then flow into the vessel, but the bulk of the air inside, pressing upon the close-packed perforations, keeps it out till she uncovers the compressed stream; but then air escapes and an equal volume <<15>> of water runs in,—just in the same way, when water occupies the depths of the brazen vessel and the opening and passage is stopped up by the human hand, the air outside, striving to get in, holds the water back at the gates of the ill-sounding neck, pressing upon its surface, till she lets go with her hand. <<20>> Then, on the contrary, just in the opposite way to what happened before, the wind rushes in and an equal volume of water runs out to make room.[566] Even so, when the thin blood that surges through the limbs rushes backwards to the interior, straightway the stream of air comes in with a rushing swell; <<25>> but when the blood returns the air breathes out again in equal quantity. (101) (The dog) with its nostrils tracking out the fragments of the beast’s limbs, and the breath from their feet that they leave in the soft grass.[567] (102) Thus all things have their share of breath and smell. (103, 104) Thus have all things thought by fortune’s will.... And inasmuch as the rarest things came together in their fall. (105) (The heart), dwelling in the sea of blood that runs in opposite directions, where chiefly is what men call thought; for the blood round the heart is the thought of men. R. P. 178 a. (106) For the wisdom of men grows according to what is before them. R. P. 177. (107) For out of these are all things formed and fitted together, and by these do men think and feel pleasure and pain. R. P. 178. (108) And just so far as they grow to be different, so far do different thoughts ever present themselves to their minds (in dreams).[568] R. P. 177 a. (109)