he
action of another subtle air called Samana. And this latter transforming
itself into Apana air, and supported by the head of the stomach carries
the refuse matter of the body, urine &c, to the kidneys and intestines.
That same air is present in the three elements of effort, exertion and
power, and in that condition it is called Udana air by persons learned in
physical science, and when manifesting itself by its presence at all the
junctional points of the human system, it is known by the name Vyana. And
the internal heat is diffused over all the tissues of our system, and
supported by these kinds of air, it transforms our food and the tissues
and the humours of our system. And by the coalition of Prana and other
airs, a reaction (combination) ensues, and the heat generated thereby is
known as the internal heat of the human system which causes the digestion
of our food. The Prana and the Apana air are interposed within the Samana
and the Udana air. And the heat generated by their coalition causes the
growth of the body (consisting of the seven substances, bones, muscles,
&c). And that portion of its seat extending to as far as the rectum is
called Apana; and from that arteries arise in the five airs Prana, &c.
The Prana air, acted on by the heat strikes against the extremity of the
Apana region and then recoiling, it reacts on the heat. Above the navel
is the region of undigested food and below it the region of digestion.
And the Prana and all other airs of the system are seated in the navel.
The arteries issuing from the heart run upwards and downwards, as also in
oblique directions; they carry the best essence of our food, and are
acted upon by the ten Prana airs. This is the way by which patient Yogins
who have overcome all difficulties, and who view things with an impartial
and equal eye, with their souls seated in the brain, find the Supreme
Spirit, the Prana and the Apana airs are thus present in the body of all
creatures. Know that the spirit is embodied in corporeal disguise, in the
eleven allotropous conditions (of the animal system), and that though
eternal, its normal state is apparently modified by its
accompaniments,--even like the fire purified in its pan,--eternal, yet
with its course altered by its surroundings; and that the divine thing
which is kindred with the body is related to the latter in the same way
as a drop of water to the sleek surface of a lotus-leaf on which it
rolls. Know that sattwa, raja