A tube, called the ureter, passes out from the concave border of each kidney, turns downwards, and enters the bladder in the basin of the pelvis.

A, pyramids of Malpighi; B, apices, or papillæ, of the pyramids, surrounded by subdivisions of the pelvis known as cups or calices; C, pelvis of the kidney; D, upper end of ureter.

From the capsules, the excretion passes through the tubules into the pelvis, and on through the ureters to the bladder.

The functions of the bladder are to collect and retain the urine, which has reached it drop by drop from the kidneys through the ureters, until a certain quantity accumulates, and then to expel it from the body.

Ureter (Gr. oureo, to pass urine).

That watery matter the two kidneys expurgate by those emulgent veins and ureters.

The emulgent draw this superfluous moisture from the blood; the two ureters convey it to the bladder, which, by reason of his site in the lower belly, is apt to receive it, having two parts, neck and bottom: the bottom holds the water, the neck is constringed with a muscle, which, as a porter, keeps the water from running out against our will.

The fluid dropping from the ureter contained more urea than did the blood.