The
breath called Apana, having recourse to the heat that is in the urethra
and the abdominal intestines, moves, engaged in carrying out urine and
faeces. That single breath which operates in these three, is called Udana
by those that are conversant with science. That breath which operates,
residing in all the joints of men's bodies, is called Vyana. There is
heat in the bodies of living creatures which is circulated all over the
system by the breath Samana. Residing thus in the body, that breath
operates upon the different kinds of watery and other elementary
substances and all bad humours. That heat, residing between Apana and
Prana, in the region of the navel, operates, with the aid of those two
breaths, in digesting all food that is taken by a living creature. There
is a duct beginning from the mouth down to the anal canal. Its extremity
is called the anus. From this main duct numerous subsidiary ones branch
out in the bodies of all living creatures.[558] In consequence of the
rush of the several breaths named above (through these ducts), those
breaths mingle together. The heat (that dwells in Prana) is called
Ushman. It is this heat that causes digestion in all creatures possessed
of bodies. The breath called Prana, the bearer of a current of heat,
descends (from the head) downwards to the extremity of the anal canal and
thence is sent upwards once more. Coming back to its seat in the head, it
once more sends down the heat it bears. Below the navel is the region of
digested matter.
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