. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 76 MORPHOLOGY OF THE CELL. such as caustic potash, and the like. But sometimes the cell- â wall seems to be completelj- changed into covk-substance. 249. Cork-substance behaves towards reagents in nearly- all respects as culin does (see 157). ^m^. onooooii- 57 250. Cells which have been completel3' snherized can be sepa- rated from each other b}- the gradual action of Schulze's macer- ating solution.* The color of cork-cells is not dependent npon the amo
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 76 MORPHOLOGY OF THE CELL. such as caustic potash, and the like. But sometimes the cell- â wall seems to be completelj- changed into covk-substance. 249. Cork-substance behaves towards reagents in nearly- all respects as culin does (see 157). ^m^. onooooii- 57 250. Cells which have been completel3' snherized can be sepa- rated from each other b}- the gradual action of Schulze's macer- ating solution.* The color of cork-cells is not dependent npon the amount of the change of the wall into cork-substance. The walls of the cells in some species of willow are colorless, while those in other species are distinctly yellow; and yet the former have been as thoroughly changed into cork-substance as the latter. II. Cells of the Fibro-vasoular System, â Prosenchyma in the widest seuse. 252. The cells and modified cells of this S3-stem constitute the framework of a plant. In a few of the higher and in many of the lower plants it is barely if at all developed, the entire structure consisting, in such cases, of a mass of parenchyma covered by epidermis. But in most plants it exists as a skeleton 1 This fact has led to the belief that there exists in such cases .in interme- diate plate which differs in its character fi-om the rest of the cell-wall; but prolonged action of the same reagent, especially with warming, causes the cells to break down and ultimately form a disorganized mass. Pig. 57. Formation of cork and seconilary cortex in Betulaverrucosa. A, B, C, D, snccessiTO stages; 1, first layer of seconilary cortex; 2, layer which divides in B, to give outside the first layer of curk (shown in C), and a layer, 3, within, which again divides ill I). (Sauio.). 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 n
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