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. The difference between these two kinds
of fat has already been set forth in other passages. The formation,
then, of fat in the kidneys is the result of necessity; being, as
explained, a consequence of the necessary conditions which accompany
the possession of such organs. But at the same time the fat has a
final cause, namely to ensure the safety of the kidneys, and to
maintain their natural heat. For placed, as these organs are, close to
the surface, they require a greater supply of heat than other parts.
For while the back is thickly covered with flesh, so as to form a
shield for the heart and neighbouring viscera, the loins, in
accordance with a rule that applies to all bendings, are destitute
of flesh; and fat is therefore formed as a substitute for it, so
that the kidneys may not be without protection. The kidneys, moreover,
by being fat are the better enabled to secrete and concoct their
fluid; for fat is hot, and it is heat that effects concoction.
Such, then, are the reasons why the kidneys are fat. But in all
animals the right kidney is less fat than its fellow. The reason for
this is, that the parts on the right side are naturally more solid and
more suited for motion than those on the left. But motion is
antagonistic to fat, for it tends to melt it.
Animals then, as a general rule, derive advantage from their kidneys
being fat; and the fat is often very abundant and extends over the
whole of these organs
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