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. For the heart,
like the other viscera, is one of the homogeneous parts; for, if cut
up, its pieces are homogeneous in substance with each other. But it is
at the same time heterogeneous in virtue of its definite
configuration. And the same is true of the other so-called viscera,
which are indeed formed from the same material as the heart. For all
these viscera have a sanguineous character owing to their being
situated upon vascular ducts and branches. For just as a stream of
water deposits mud, so the various viscera, the heart excepted, are,
as it were, deposits from the stream of blood in the vessels. And as
to the heart, the very starting-point of the vessels, and the actual
seat of the force by which the blood is first fabricated, it is but
what one would naturally expect, that out of the selfsame nutriment of
which it is the recipient its own proper substance shall be formed.
Such, then, are the reasons why the viscera are of sanguineous aspect;
and why in one point of view they are homogeneous, in another
heterogeneous.
2
Of the homogeneous parts of animals, some are soft and fluid, others
hard and solid; and of the former some are fluid permanently, others
only so long as they are in the living body. Such are blood, serum,
lard, suet, marrow, semen, bile, milk when present, flesh, and their
various analogues. For the parts enumerated are not to be found in all
animals, some animals only having parts analogous to them
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