Rural Chemistry An Elementary Introduction to the Science in Its Relation to a

Cover Rural Chemistry An Elementary Introduction to the Science in Its Relation to a
Rural Chemistry An Elementary Introduction to the Science in Its Relation to a
Edward Solly
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EXCREMENTS. 297 787. The vegetable substances which constitute the food of animals contain more earthy and saline matters than animals require, and they are ac- cordingly passed from the body as excrementitious. The food of animals in great part goes to supply the waste occasioned by respiration. In this process, carbonic acid is formed by the oxidation of carbon in the body, by the oxygen of the air; hence, in the air expired from the lungs, it is found that the oxygen is more or less combined
... with carbon, and converted into carbonic acid (107, 606). The heat evolved by the combination of this carbon with oxygen keeps up the warmth of the body. The waste of organic matter in the body thus occasioned, is supplied by food, the organic part of which sup- plies that consumed by respiration; but as the great- er part of the inorganic substances contained in food are not required for this purpose, the excess is void- ed in the solid and fluid excrements.
788. There are few things of greater value as manures than these offensive and apparently useless substances, which consist of a mixture of organic and inorganic matters ; the former, in consequence of the nitrogen they always contain, ready to de- compose, and furnish carbonic acid and ammonia ; the latter, those very substances which we require to add to the soil, being the very substances which are removed with crops.


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