Articles liés à Library of Universal Knowledge. A Reprint of the Last...
Library of Universal Knowledge. A Reprint of the Last (1880) Edinburgh and London Edition of Chambers' Encyclopaedia, With Copious Additions by American Editors; Volume 13 - Couverture rigide
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Présentation de l'éditeur
On submitting to incineration a plant which has been dried at a moderate heat till it ceases to lose weight, we find that the residue, which consists of mineral salts and a little carbon, is much lighter tkan the original plant, the portion which is burned off, or apparently lost, corresponding to the organic constituents of the plant. Hence every plant, like every animal, is composed of organic and mineral or inorganic constituents. While the mineral constituents of the plant are also found in the crust of the earth, the organic constituents are primarily formed in the plant itself from inorganic matters, viz., from water, atmospheric air, and the soil, which collectively may be termed the food of plants. The following general principles may be laid down regarding the organic constituents which mainly contribute to form the bulk of the body of the plant: (1.) All organic constituents of plants contain carbon. (2.) All such organic constituents contain hydrogen. Some of them, as, for example, many ethereal or volatile oils, consist solely of these two elements-. (3.) The greater proportion of these compounds contain oxygen in addition to the two preceding elements. To this class belong those constituents of plants which are at the same time of the most general diffusion and of the greatest physiological and economic importance; namely, the so-called carbo-hydrates, which consist of carbon combined with hydrogen and oxygen in the exact proportion in which the last two elements form water. Under this title are included cellulose, starch, gum, etc. Other organic constituents contain not only carbon with hydrogen and oxygen in the above ratio, but an excess of oxygen. In this category may be placed almost all the organic acids, many ethereal oils, wax, the resins, many of the so-called glycosides, and the fats. (4.) With the above elements, nitrogen is associate
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- ÉditeurWentworth Press
- Date d'édition2016
- ISBN 10 1374275166
- ISBN 13 9781374275164
- ReliureRelié
- Langueanglais
- Nombre de pages888
- Coordonnées du fabricantnon disponible
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