. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. 12 A PATTERN PLAKT. [section 2, 11. On committing these seeds to moist and warm soil tbej soon sprout, 1. e. germinate. The very short stem-part of the embryo is the first to grow. It lengthens, protrudes its root-end; this turns downward, if not already pointing in that direction, and while it is lengthening a root forms at its point and grows downward into the ground. This' root continues to grow on from its lower end, a


. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. 12 A PATTERN PLAKT. [section 2, 11. On committing these seeds to moist and warm soil tbej soon sprout, 1. e. germinate. The very short stem-part of the embryo is the first to grow. It lengthens, protrudes its root-end; this turns downward, if not already pointing in that direction, and while it is lengthening a root forms at its point and grows downward into the ground. This' root continues to grow on from its lower end, and thus insinuates itself and penetrates into the soil. The stem meanwhile is addmg to its 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 uulike that of ordinary leaves. Now, relieved of a part of this store of food, which has formed the 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 oif the seed-husk; they expand, diverge into a horizontal position, turn green, and thus become a pair of evident leaves, the first foHage of a tiny plant. This seedling, although diminutive and most simple, possesses and puts into use, all the Obgans of , 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 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 uiatter, i. e. into the material for further growth. 12. Further Growth soon proceeds to the formation of new


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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887