. An introduction to vegetable physiology. Plant physiology. METABOLISM 273 teristic shape (fig. 132, a, b). In these cases the cluster of crystals is usually invested by a-delicate skin derived from the protoplasm, thus shutting it off completely from any participation in the metabolism of the cell in which it lies. Carbonate of calcium may also be deposited in the substance of the cell-wall, or of protrusions from it, as in the cystoliths of Ficus, Urtica, and other plants (fig. 129). Silica again is accumulated in the epidermis of many grasses, and of the horsetails (Equisetum). Though many
. An introduction to vegetable physiology. Plant physiology. METABOLISM 273 teristic shape (fig. 132, a, b). In these cases the cluster of crystals is usually invested by a-delicate skin derived from the protoplasm, thus shutting it off completely from any participation in the metabolism of the cell in which it lies. Carbonate of calcium may also be deposited in the substance of the cell-wall, or of protrusions from it, as in the cystoliths of Ficus, Urtica, and other plants (fig. 129). Silica again is accumulated in the epidermis of many grasses, and of the horsetails (Equisetum). Though many of these substances, both excretions and bye-products, are of no value for nutrition, some of them. Pig. 128.—Crystals of Oxalvte of Calcium, a, from Beet (Sphcsra- phides); b, feom Arum (Baphides). cys~~~~. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. Philadelphia, P. Blakiston
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