. The elements of botany for beginners and for schools. Botany. 12 A PATTERN PLANT. [SECTION 2. ^ 11. On committ ing tlieso seeds to moist and warm soil tbcj soon sprout, i. e. (jermimte. Tlic very short stem-part of the embryo is the first to grow. It lengthens, protrudes ils rool-eud; this turns downward, if not already pointing in that direction, and while it is Icngthoning a root forms at its point and grows downward into the ground. This root continues to grow on from its lower end, and tlius insinuates itself and penetrates into tlie soil. The stem meanwhile is adding to lis length throu
. The elements of botany for beginners and for schools. Botany. 12 A PATTERN PLANT. [SECTION 2. ^ 11. On committ ing tlieso seeds to moist and warm soil tbcj soon sprout, i. e. (jermimte. Tlic very short stem-part of the embryo is the first to grow. It lengthens, protrudes ils rool-eud; this turns downward, if not already pointing in that direction, and while it is Icngthoning a root forms at its point and grows downward into the ground. This root continues to grow on from its lower end, and tlius insinuates itself and penetrates into tlie soil. The stem meanwhile is adding to lis length throughout; it erects itself, and, seeking the light, brings the seed up out of the ground. The mate- rials for this growth have been supplied by the cotyledons or seed-leaves, still in the seed: it was the store of nour- ishing material they held which gave them their thickish shape, so unlike that of ordinary leaves. Now, relieved of a part of this store of food, which has formed tlie growth by which they have been raised into the air and light, they appropriate the remain- der to their own growth. In enlarging they open and throw off the seed-husk ; they expand, diverge into a horizontal position, turn green, and thus become a pair of evident leaves, the first foliage of a tiny plant. This seedling, although diminutive and most simple, possesses and puts into use, all the Organs of Vegetation, namely, root, stem, and leaves, each in its proper element,—the root in the soil, the stem rising out of it, the leaves in the light and open air. It now draws in moisture and some 6 5 7 food-materials from the soil by its root, conveys this through the stem into the leaves, where these materials, along with other crude food which these imbibe from the air, are assimilated into vegetable matter, i. e. into the materia! for further growth. 12. Further Growth soon proceeds to the formation of new parts, — downward in the production of more root, or of branches of the main root, upward in
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
