. An encyclopædia of gardening; . that in whicha strong and often thick bark encloses a circular layer of longitudinal fibres,or st ver:il sucli ciiTular and concentric layers, interwoven with thin transverse anddivergent layers of pulp, so as to form a firm and compact cylinder, in the centre ofwhich is lodged a pulp or pith. This mode is best exemplified in trees and slirubs{fig. 49.), though it is also applicable to many plants whose texture is chiefly oralmost wholly lierbaceous, forming as it were the connecting link between suchplants as are purely herbaceous on the one hand, and sucli a
. An encyclopædia of gardening; . that in whicha strong and often thick bark encloses a circular layer of longitudinal fibres,or st ver:il sucli ciiTular and concentric layers, interwoven with thin transverse anddivergent layers of pulp, so as to form a firm and compact cylinder, in the centre ofwhich is lodged a pulp or pith. This mode is best exemplified in trees and slirubs{fig. 49.), though it is also applicable to many plants whose texture is chiefly oralmost wholly lierbaceous, forming as it were the connecting link between suchplants as are purely herbaceous on the one hand, and sucli as are purely woody onthe other. In the latter case the wood is perfect; in the former case it is wood being imperfect in the root of the beet, the common bramble, and burdock jand perfect in the oak or alder. 616. The appendages of the plant, whether conservative or reproductive, exhibitnothing in their internal structure that is at all essentially dififerent from that of theorgans that have been already describecL. Sect. II. Co7n])osite Organs. 6] 7. From the preceding analysis, it appears the decomposite organs are reducible toone or other of the several following substances, namely, epidermis, pulp, pith, corticallayers, ligneous layers, and vegetable fibre. These now remain to be further analysed, underthe title of composite organs, as being still compound, with a view to reach the ultimateand elementary organs of the vegetable subject. 618. Structure of the vegetable epidermis. The epidermis of the vegetable, which, from its resemblanceto that of the animal, has been designated by the same name, is the external envelope or integument ofthe plant, extending over the whole surface, and covering the root, stem, branches, leaves, flower, andfruit, with their appendages ; the summit of the pistil only excepted. But although it is extended overthe whole surface of the plant, it is not of equal consistence throughout. In the root and trunk it is atough and leathery
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Keywords: ., bookcentury1800, bookdecade18, booksubjectgardening, bookyear1826
