. La plante, une illustration de la vie organique de l'animal . exhalation de l'oxygène par les feuilles et autres parties vertes. Les matières contenues dans les tissus des plantes sont veryvarious, et sont solides, liquides ou gazeux. Toutes les matières solides, comme l'amidon et le chlorophyl, sont ASSIMILÉES. Les cellules, telles que la gomme et le sucre, le chromulle, les huiles fixes et volatiles, les acides organiques, etc., sont les résultats de l'oxydation. Le stachand chlorophyl est donc le produit de la dégestion des légumes, les autres substances de l'respir végétal

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. The plant, an illustration of the organic life of the animal . exhalation of oxygen by theirleaves and other green parts. The matters contained in the tissues of plants are veryvarious, and are either solid, liquid, or gaseous. All solidorganic matters, such as starch and chlorophyl, are formed ASSIMILATION. Ill by de-oxydizing processes, the fluid contents, of the cells, such as gum and sugar, chromule, the fixed and volatileoils, organic acids, &c., are the results of oxydation. Starchand chlorophyl are therefore the products of vegetable di-gestion, the other substances of vegetable respiration. Thiswill be clearly seen if we consider the nature of these sub-stances. They are of great importance in the vegetableeconomy, and must be carefully studied if we would obtaincorrect views of the nutrition of plants. Starch is one of the most abundant and useful productsof vegetation. It exists in the seeds, roots, and stems ofplants, and in the pulp of fruits; for whilst chlorophyl isformed only on the outer surface of plants, starch is re-Pig. 22.. a. Club-shaped granules in milky juice of JEuphorMa splendens. &. Threeof the lactiferous vessels, with starch granules in situ.—Quekett. stricted to their interior, light being absolutely necessaryin the one case and darkness in the other. Starch existsin the cells of plants in the form of transparent and color-less granules, which vary in figure and size in differentspecies. They are for the most part of an ovoid shape;but, in the Euphorbiaceae, their shape is like an elongated 112 THE NUTRITIVE FUNCTIONS. dumb-bell or two-headed club. By wounding tbe plant, and placing a drop of tbe milky juice under tbe micro-scope, these singularly-formed granules may be easily seenby tbe addition of a little tincture of iodine, wbicb givesthem a deep blue tinge. Starcb granules are the mosteasily observed in the cells of the potato where they arevery large. On the application of tincture of iodine, thestarch granules are readily disti

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• bookcentury1800
• bookdecade1850
• bookidcu3192
• booksubjectbiology