. 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. now PLANTS GROW FROM THE SEED. 13 ol. The Eoot keeps on growing under ground, and sending off more and more small branches or rootlets, each one adding something to the amount of absorbing surface in contact -with the moist soil. The little stem likewise lengthens upwards, and the pair of leaves on its summit grow larger. But these soon get their full growth; and we do not yet see,
. 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. now PLANTS GROW FROM THE SEED. 13 ol. The Eoot keeps on growing under ground, and sending off more and more small branches or rootlets, each one adding something to the amount of absorbing surface in contact -with the moist soil. The little stem likewise lengthens upwards, and the pair of leaves on its summit grow larger. But these soon get their full growth; and we do not yet see, perhaps, where more are to come from. But now a little bud, called the Plumule, appears on the top of the stem (Fig. 22), just be- tween the stalks of the two seed-leaves ; it enlarges and unfolds into a leaf; this soon is raised upon a new piece of stem, which car- ries up the leaf, just as the pair of seed-leaves were raised by the lengthening of the radicle or first joint of stem in the seed. Tlien another leaf appears on the summit of this joint of stem, and is raised upon its own joint of stem, and so on. Fig. 23 shows the same plant as Fig. 22 (leaving out the root and the lower part of the stem), at a later stage; c, c, are the seed-leaves ; / is the next leaf, which came from the plumule of Fig. 22, now well raised on the second joint of stem ; and /' is the next, still very small and just unfolding. And so the plant grows on, the whole summer long, producing leaf after leaf, one by one, and raising each on its own joint of stem, arising from tlie summit of the next below ; — as we see in -^ Fig. 4, at the beginning of the chapter, where many joints of stem have grown in this way (the first Avith a pair of leaves, the rest with one apiece), and still there are some unfolding ones at the slender young summit. 32. How t!:C Seedling is nourished at Ihc Beginning. Growth requires/oocZ, in plants as well as in animals. To grow into a plant, the embryo in a seed must be fed
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