. An encyclopædia of gardening; . plants, he regards the pulp, or cellular tissue, as consisting of two distinctportions, which he designates by the respective appellations of the herbaceous tissue, and the former is the exterior portion of the cellular tissue, of which the cells always contain a resinous andcolored juice, that communicates its peculiar tinge to the epidermis. The latter is the interior portion of thetissue, composed also of cells, but differing from those of the herbaceous tissue in containing only awatery juice without color, because it has not been exposed to
. An encyclopædia of gardening; . plants, he regards the pulp, or cellular tissue, as consisting of two distinctportions, which he designates by the respective appellations of the herbaceous tissue, and the former is the exterior portion of the cellular tissue, of which the cells always contain a resinous andcolored juice, that communicates its peculiar tinge to the epidermis. The latter is the interior portion of thetissue, composed also of cells, but differing from those of the herbaceous tissue in containing only awatery juice without color, because it has not been exposed to the action of the light, though in the calyxand fruit this watery juice is said to be also often colored. But in the description of the vegetable pulp,the only distinction necessary to be made is that by which it is divided into two parts, namely, anapparatus of hexagonal cells or vesicles, and a contained juice, whether colorless or colored, the union ofwhich substances forms a true pulp. 13oOK I. INTERNAL STRUCTURE OF of the wood, are sufH- 020. T/ie pith, as has been already shown, is a soft and spongy, but often succulentsubstance, occupying tlie centre of the root, stem, and branches, and extending inthe direction of their longitudinal axis, in wliicli it is enclosed as in a tube. Thestructure of the pith is precisely similar to that of the pulp, being composed of anassemblage of hexagonal cells containing a watery and colorless juice, or of cellulartissue and a parenchyma. 621. The cortical layers, or interior and concentric layers, constituting the massof the bark, are situated immediately under the cellular integument, where suchintegument exists, and where not, immediately under the epidermis; or they arethemselves external. They are distinguishable chieriy in the bark of woody plants,but particularly in that of the lime-tree. They composed of two elementaryparts — bundles of longitudinal fibres constituting a network {Jig. 50.), and amassof pulp more
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Keywords: ., bookcentury1800, bookdecade18, booksubjectgardening, bookyear1826
