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CHAPTER III. Structure of plants?Mode in which their nourishment is
obtained ?Growth and substance of plants?Production of their
substance from the food they imbibe?mutual transformations of
starch, sugar, and woody fibre. From the compound substances,
described in the preceding chapter, plants derive the greater
portion of the carbon, hydrogen, oxygen, and nitrogen, of which
their organic part consists. The living plant possesses the power
of absorbing these compound bodies, of decomposing them in the
interior of its several vessels, and of recompounding their
elements in a different way, so as to produce new substances,? the
ordinary products of vegetable life. Let us briefly consider the
general structure of plants, and their mode of growth. STRUCTURE OF
THE STEM AND ROOT OF PLANTS. 29 SECTION I. OF THE STRUCTURE OF
PLANTS AND THE MODE IN WHICH THEIR NOURISHMENT IS OBTAINED. A
perfect plant consists of three several parts,? a root which throws
out arms and fibres in every direction into the soil,?a trunk which
branches into the air on every side,?and leaves which, from the
ends of the branches and twigs, spread out a more or less extended
surface into the surrounding air. Each of these parts has a
peculiar structure and a special function assigned to it. The stem
of any of our common trees consists of three parts,?the pith in the
centre, the wood surrounding the pith, and the bark which covers
the whole. The pith consists of bundles of minute hollow tubes,
laid horizontally one over the other; the wood and inner bark, of
long tubes bound together in a vertical position, so as to be
capable of carrying liquids up and down between the roots and the
leaves. When a piece of wood is sawn across, the ends of these
tubes may be distinctly seen. The branch is only ...
|Country of origin:
James Finlay Weir Johnston
||246 x 189 x 3mm (L x W x T)
||Paperback - Trade
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