Introduction à la botanique systématique et structurel, et de légumes, la physiologie : être un 5ème et revedof le texte botanique-livre, illustré par plus de 1 300 bois gravés . f le tissu même de ces fruits juteux comme thecranberry et la myrtille (Fig. 28). 42. L'épaississement de la matière, à l'état pur, est de même nature que The membrane d'origine de la cellule, c'est, il est composé de cellulose(27). Mais avec ce sont mêlés certains minéraux, smallquantities - des besoins qui doivent être dissous dans l'eau plantes imbibes whichthe par ses racines, et être déposés dans les cellules de la FIG. 27. Magnifie

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Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . f the tissue even of such juicy fruits as thecranberry and the blueberry (Fig. 28). 42. The thickening matter, when pure, is of the same nature asthe original membrane of the cell, that is, it consists of cellulose(27). But with this are mingled some mineral matters, — smallquantities of which must needs be dissolved in the water whichthe plant imbibes by its roots, and be deposited in the cells of the FIG. 27. Magnified section of the gritty cells of the pear; the cavity almost filled with aninternal deposit. 28. Similar cells found in the pulp of the blueberry (Vacciniuin corym-bosum). FIG. 29. Highly magnified cross-section of a bit of the old liber of the bark of the Birch;the tubes nearly filled with a deposit of solid matter in concentric layers. (From Link ) FIG SO. Highly magnified wood-cells (seen in transverse and longitudinal section), fromthe root of the Date Palm ; showing the thickening deposit in layers, and some connectingcanals or pits. (From Jussieu, after Mirbel.). 36 THE ELEMENTARY STRUCTURE OF PLANTS. wood, and especially in those of the leave;?, where much of the waterescapes by evaporation, — and sometimes certain coloring mattersalso, such as give the different tints to heart-wood, &c. Evenwhen purified as much as possible from all admixture of foreignmaterials, the secondary deposit is said to differ a little from cellu-lose, or original cell-membrane, in containing a somewhat largerproportion of carbon and hydrogen : it is therefore richer in combus-tible matter. Forming as it does the principal part of the weightof wood {lignum), it has received the name of Lignine (also that ofSclerogen) ; but it is only cellulose a little modified. This differ-ence in chemical composition, however, shows why the hard woods, such as hickory and oak, which abound in this lignifie

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• bookauthorgra
• bookcentury1800
• bookdecade1860
• booksubjectbotany