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. 32. It is by watching the course of these airs that I remain quiet at this place, and undergo the vicissitudes of heat and cold, as it is destined to the lot of the feathered tribe. 33. The body is a great machine, and the two airs are its indefatigable mover. It has the sun and moon or the fire and moonlight, shining in the midst of its heart. 34. The body is a city and the mind is its ruler, the two airs are as the car and wheel of the body; while Egoism is the monarch of this city, and the eight members are as so many horses attached to the car of the body. 35. Thus by watching the motion of those airs (_i.e._ of the _prána_ and _apána_--inspiration and expiration for the whole of my lifetime); I find the course of my life to be as interminable, as that of the continuity of my breathings. (The thought of continuity prolongs the course of life). 36. The airs serve the body alike in all its states of waking, dreaming, and sound sleep, and his days glide on imperceptibly who remains in his state of profound sleep. (so the yogi remaining in his trance is utterly insensible of the course of time). 37. These breaths being divided into a thousand threads, according as they pass through the many canals of the body, are as imperceptible as the white fibres passing inside the stalks of lotus plants.