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In all animals that have kidneys, that on the right is placed higher
than that on the left. For inasmuch as motion commences from the
right, and the organs on this side are in consequence stronger than
those on the left, they must all push upwards in advance of their
opposite fellows; as may be seen in the fact that men even raise the
right eyebrow more than the left, and that the former is more arched
than the latter. The right kidney being thus drawn upwards is in all
animals brought into contact with the liver; for the liver lies on the
right side.
Of all the viscera the kidneys are those that have the most fat.
This is in the first place the result of necessity, because the
kidneys are the parts through which the residual matters percolate.
For the blood which is left behind after this excretion, being of pure
quality, is of easy concoction, and the final result of thorough
blood-concoction is lard and suet. For just as a certain amount of
fire is left in the ashes of solid substances after combustion, so
also does a remnant of the heat that has been developed remain in
fluids after concoction; and this is the reason why oily matter is
light, and floats on the surface of other fluids. The fat is not
formed in the kidneys themselves, the density of their substance
forbidding this, but is deposited about their external surface. It
consists of lard or of suet, according as the animal's fat is of the
former or latter character
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