A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . dence? WTiat further indi-cations might you expect tofind, if they are true branchingstems? (100.) On old haw,plum, crab, and pear trees, stems can be found in all stagesof transition, from stubby, ill-developed branches, to well-defined thorns. 103. Storage of nourishment. — This isone of the most frequent causes of modifi-cation in both roots and stems. Of stemsthat grow above ground, the sugar caneprobably comes first in economic importanceon this account. In hot, arid regions,
A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . dence? WTiat further indi-cations might you expect tofind, if they are true branchingstems? (100.) On old haw,plum, crab, and pear trees, stems can be found in all stagesof transition, from stubby, ill-developed branches, to well-defined thorns. 103. Storage of nourishment. — This isone of the most frequent causes of modifi-cation in both roots and stems. Of stemsthat grow above ground, the sugar caneprobably comes first in economic importanceon this account. In hot, arid regions, wherethe moisture drawn from the earth would,during prolonged drought, be too rapidlydissipated by an expanded surface of leaves,the whole plant, as in the case of the cactus,is sometimes compacted into a greatly thick-ened stem, which fills the triple office of leaf,stalk, and water reservoir. 104. The uses of underground stems. —It is in these that the storage of nourishmentmost frequently takes place, and the modi-fications that stems undergo for this purposeare iji some cases so great that their real. Fig. 103.—Meloncactus, showinggreatly condensedstem for the storageand preservation ofmoisture. THE STEM 91
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