. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 136 CORK a continuous tissue consisting of numerous radial files of cells, each file (Fig, 65, 1-6) representing the product of one cork- cambium cell. This tissue is the cork and, apart from the absence of intercellular spaces between its cells, it is especially characterised by a chemical modification of the cell-walls spoken of as suherisation. This latter renders them practically imper- vious alike to gases and to liquids, features to which cork owes its utilisation in closing Fig. 65.—Transvers
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 136 CORK a continuous tissue consisting of numerous radial files of cells, each file (Fig, 65, 1-6) representing the product of one cork- cambium cell. This tissue is the cork and, apart from the absence of intercellular spaces between its cells, it is especially characterised by a chemical modification of the cell-walls spoken of as suherisation. This latter renders them practically imper- vious alike to gases and to liquids, features to which cork owes its utilisation in closing Fig. 65.—Transverse section through the cork layer in the stem of the Elder (Sambuciis). ex., cork-cambium ; cii., cuticle ; ep., epidermis ; Ph., phelloderm ; 1-6, successive segments of the cork in order of production. Suherisation is known to be due to the presence of various fatty compounds, and hence the walls of the cork are coloured by the same reagents (Scharlach red, etc.) as are employed for staining fats. A yellow-brown colouration is assumed \"\'ith chlor- zinc-iodide, and a yellow one with strong potash. A marked green colouration is obtained by treating cork-cells with a freshly prepared alcoholic solution of chlorophyll, which is allowed to act for about a quarter of an hour in the dark. On boiling with concentrated potash, large yellow globules often escape from the. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
