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Updated: September 24, 2025


This is an air-tight chamber, artificially supplied with a constant stream of pure air, and from which the expired air, laden with the products of respiration, is withdrawn for purposes of analysis. The subject may remain in the chamber for days, the composition of all food and all excrete being determined, and all heat that is given off being measured.

An eminent physiologist accounts for the presence of rudimentary organs, by supposing that they serve to excrete matter in excess, or matter injurious to the system; but can we suppose that the minute papilla, which often represents the pistil in male flowers, and which is formed of mere cellular tissue, can thus act?

The sight which greeted his eyes caused him to excrete a single mouthful of vivid profanity, made him grip his gun like a hero, set every nerve in his noble and faithful body tingling. Apparently however he had forgotten completely his gun, which lay faithfully and expectingly in his two noble hands. "Attention!" screamed the sergeant.

I removed all the ants from a group of about a dozen aphides on a dock-plant, and prevented their attendance during several hours. After this interval, I felt sure that the aphides would want to excrete.

For the dust will get in your nose, clog your ears, make clay in your mouth and mortar in your eyes, and so stop up all the natural passages to the soul; whereby the wickedness which that subtle organ doth constantly excrete is balked of its issue, tainting the entire system with a grievous taint.

Certain plants excrete a sweet juice, apparently for the sake of eliminating something injurious from their sap: this is effected by glands at the base of the stipules in some Leguminosae, and at the back of the leaf of the common laurel. This juice, though small in quantity, is greedily sought by insects.

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