These corridors, the secretory or excretory ducts, are present, for example, in the liver, conducting the bile to the small intestine.

But every furnace requires a smoke-stack to carry off the waste, and, similarly, we must have in our bodies an excretory system to remove the waste of the burned-up material and of the used-up tissue of the heart, muscles and nerves.

This constitutes the digestive system; the lungs, the excretory system and the circulatory system are absolutely necessary to support the combustion which is going on in nerve and muscle and without which energy is impossible.

This process of absorption is probably accomplished in the interradial or ciliated chambers, more probably in the former, as the latter are generally considered excretory in function.

These chemical substances are unusable by the system, and must all be removed by the liver and excretory organs, thus imposing upon them an extra and unnecessary burden.

When any living creature ceases to exercise, its excretory organs cease to perform their functions thoroughly, and its body becomes saturated with retained excretions.

It has frequently done great service in some kinds of scurvies and other chronic disorders proceeding from a viscidity of the juices, or obstructions of the excretory ducts.

L. E. D.These are powerfully stimulating, attenuating, and detergent: and hence, in cold phlegmatic habits, they quicken the circulation, dissolve tenacious juices, open obstructions of the excretory glands, and promote the fluid secretions.