. Botany for young people and common schools. How plants grow, a simple introduction to structural botany. With a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany. HOW PLANTS GROW PKOM THE SEED. 15 embryo imbibes and feeds on as it sprouts. That the meal or starch of the grain is actually changed into sugar at this time is clearly shown by malting, which is merely causing heaps of grain to sprout a little, and tiien destroying the life of the embryo by dry heat; when the grain (now malt) is found to be sweet, and to contain much sugar. 36. The
. Botany for young people and common schools. How plants grow, a simple introduction to structural botany. With a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany. HOW PLANTS GROW PKOM THE SEED. 15 embryo imbibes and feeds on as it sprouts. That the meal or starch of the grain is actually changed into sugar at this time is clearly shown by malting, which is merely causing heaps of grain to sprout a little, and tiien destroying the life of the embryo by dry heat; when the grain (now malt) is found to be sweet, and to contain much sugar. 36. The nourishment which the mother-plant provides in the seed is not always stored up outside of the embryo. In many cases it is deposited in the emhryo itself, most commonly in the seed-leaves. Then the seed consists of nothing but the embryo within its coats. IMaple-seeds are of this sort. Fig. 24 represents a seed of Hed Maple in tlie lower part of the winged seed- vessel, which is cut away so as to shmv it in its place. Fig. 25 is the seed a little magnified, and with the coats cut away, bringing to view its embryo coiled up within and tilling the seed completely. Fig. 26 is the embryo taken out, and a little unfolded ; below is the radicle or stemlet; above are the two seed-leaves partly crumpled together. Fig. 27 is the embryo when it has straight- ened itself out, thrown off the seed-coats, and begun to grow. Here the seed-leaves are rather thick when they first unfold ; this is on account of the nourishing matter which, was contained in their fabric, and which is. used mainly for the earliest growth of the- radicle or stemlet, and for the root formed, at its lower end, as we see in the next fig- ure (Fig. 28: a, the radicle or stemlet of the embryo; h, h, the two seed-leaves;: c, the root). By this time the little stock of nourishment is exhausted. But the- plant, having already a root in the soil and a pair of leaves in the air, is able to. shift for itself, to take in air,
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