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. Thus attached, it covers the rest
of the stomach and the greater part of the bowels, and this alike in
all sanguineous animals, whether they live on land or in water. Now
the development of this part into such a form as has been described is
the result of necessity. For, whenever solid and fluid are mixed
together and heated, the surface invariably becomes membranous and
skin-like. But the region in which the omentum lies is full of
nutriment of such a mixed character. Moreover, in consequence of the
close texture of the membrane, that portion of the sanguineous
nutriment will alone filter into it which is of a greasy character;
for this portion is composed of the finest particles; and when it
has so filtered in, it will be concocted by the heat of the part,
and will be converted into suet or lard, and will not acquire a
flesh-like or sanguineous constitution. The development, then, of
the omentum is simply the result of necessity. But when once formed,
it is used by nature for an end, namely, to facilitate and to hasten
the concoction of food. For all that is hot aids concoction; and fat
is hot, and the omentum is fat. This too explains why it hangs from
the middle of the stomach; for the upper part of the stomach has no
need of it, being assisted in concoction by the adjacent liver. Thus
much as concerns the omentum.
4
The so-called mesentery is also a membrane; and extends continuously
from the long stretch of intestine to the great vessel and the
aorta
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