22. Then the etherial air which is inhaled through the nostrils, supplies these lotiform organs with moisture, as if it poured water at their roots, and makes them shoot out in soft leaflets, shaking gently at the breath of air, passing incessantly through the lungs and nostrils.
23. The shaking leaves agitate the vital air, as the moving leaves of the trees in the forest, increase the force of the current air in the firmament.
24. The inflated vital air then passes in many ways, through the holes of the entrails inside the body, and extends to and fills all the pores and canals of the frame from top to bottom.
25. These then receive different appellations, according to their course through the several, and are denominated as the five fold vital airs of _prána_, _apána_, _samána_, _udána_, and _vyána_; by them that are skilled in science of pneumatic. (The _prána-váyu_ is the breathing of the nostrils, the _apána_ is the wind in _ano_, _samána_ is the air circulating through the whole body, _udána_ is the air of speech, and the _vyána_ is the air let out through the pores of the whole body).
26. All the vital powers reside in the triple lotiform organ of the heart, and thence extend up and down and on all sides like beams from the lunar disk.
27. These vital powers are employed in passing in and out, in taking in and letting out, in rising and falling, and also in moving throughout the body.
28. The prána or air of life is said by the learned to be situated in the lotus formed organ of the heart, which has also the power of moving the eyelids in their twinklings. (Hence one's life time is measured both by the numbers of his breathings, as also by that of the twinklings of his eye).
29. This power some times assumes the form of touch or the feeling of perception, and at others it takes the shape of breath by blowing through the nostrils. Some times it is seated in the stomach for culinary action, and oft-times it gives utterance to speech.
30. What more shall I say, than that it is our lord--the air, that moves the whole machine of the body, as a mechanic models everything by means of his machinery.
31. Among these there are two principal airs, by name of _prána_ and _apána_, which take their two different courses upward and downward, the one is the breath of life and the other is the vitiated which is let out.