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. For
this reason, should the kidneys of a man be once attacked by
disease, the malady is not easily expelled. For it is as though many
kidneys were diseased and not merely one; which naturally enhances the
difficulties of a cure.
The duct which runs to the kidney from the great vessel does not
terminate in the central cavity, but is expended on the substance of
the organ, so that there is no blood in the cavity, nor is any
coagulum found there after death. A pair of stout ducts, void of
blood, run, one from the cavity of each kidney, to the bladder; and
other ducts, strong and continuous, lead into the kidneys from the
aorta. The purpose of this arrangement is to allow the superfluous
fluid to pass from the blood-vessel into the kidney, and the resulting
renal excretion to collect by the percolation of the fluid through the
solid substance of the organ, in its centre, where as a general rule
there is a cavity. (This by the way explains why the kidney is the
most ill-savoured of all the viscera.) From the central cavity the
fluid is discharged into the bladder by the ducts that have been
mentioned, having already assumed in great degree the character of
excremental residue. The bladder is as it were moored to the
kidneys; for, as already has been stated, it is attached to them by
strong ducts. These then are the purposes for which the kidneys exist,
and such the functions of these organs
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