. La storia naturale delle piante, le loro forme, la crescita, la riproduzione e la distribuzione;. La botanica. Figura 10.-i condotti di collegamento tra la cella adiacente-cavità. 1, bordered box. 2, la sezione di un delimitato pit. 3, la modalità di connessione delle celle adiacenti in bundle-guaina di Scolopendrium. *, S(colabrodo-tubi. B, gruppo di cellule da sementi di Nux vomica-, i protoplasti di cella adiacente-cavità collegate da sottili filamenti protoplasmic. Cinque volte spesso come il vetro stesso. In altri casi, tuttavia, la parete cellulare diventa venti o trenta volte spesso come era stato in un primo momento, e l'interno della cel

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. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. Fig 10.—Connecting Passages between adjacent Cell-cavities. 1, Bordered pits. 2, Section of a bordered pit. 3, Mode of connection of adjacent cells in the bundle-sheath of Scolopendrium. *, S(ieve-tubes. B, Group of cells from seed of Nux-vomica, the protoplasts of adjoining cell-cavities connected by fine protoplasmic filaments. five times as thick as the window-pane itself. In other cases, however, the cell-wall becomes twenty or thirty times as thick as it was at first, and the interior of the cell is thereby seriously diminished in size. But even if, little by little, the cell-wall augments in thickness a hundredfold, any spot where thickening has not taken place from the first, and where, accordingly, a little depression occurs, is not subsequently covered with cellulose, but is carefully kept open by the protoplast as it builds. A greatly thickened wall of this kind resembles a fortification provided here and there with deep, narrow loopholes. Where two cells thus provided adjoin one another, the windows in the one occur, normally, exactly opposite those of its neighbour, and the result is the formation of canals, very long relatively, which penetrate through the two adjacent cell-walls and connect the neighbouring cell- cavities together (fig. 103). A canal of this kind is still closed, it is true, in the middle by the original cell-membrane as though by a lock-gate; but this slight obstruction may be removed later by solution, and the contiguous cells have then perfectly open connection through the canal. Very frequently provision is made in the very first rudiments of a cell-mem-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Kerner von Marilaun, Anton, 1831-1898; Oliver, F. W. (Francis Wal

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• booksubjectbotany
• bookyear1895