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independent actions of their own and so they are not the
direct causes of any disease. It is by association with
any one of the other three substances that these two can
function. Vayu and the other two however, can individually
bring about an effect independently of any other substances.
Vayu, Pitta and Kapha may be deranged by their
respective Nidanas (i.e. causes of derangement), the derange-
ment of one may be effected independently of any other
derangements. The Earthy parts of the body, however, are
affected only by the action of one or the other of the
three substances, Vayu, Pitta and Kapha. So although the
earth is a constituent, even the main support, of the body,
it is not recognised as a Dosa, because it has no independent
control over the preservation and destruction of the body.
Similarly, although we have to acknowledge the
existence of Akasa or ethereal space within the hardest
stone, because otherwise no action can take place between
two substances ( say for example between two paramanus or
molecules of the stone), yet the other has no independent
action. Also as the ether is not made up of parts like Vayu
and others, there can be no vikriti or abnormality of Ether
and consequently there is no question of its bringing about
any derangement or destruction of other substances.
We therefore conclude that both Prithivi and Akasa
have nothing to do with the destruction of the body.