. Botany for high schools and colleges. Botany. Fig. 115.—Transverse sections of young stem of Ivy {Eedera helix). A, young in- tercellular gum canal, surrounded by four cells ; c, cambium; ivb, soft bast ; E, fully developed canal, g ; b, bast; rp, cortical parenchyma, x 800.—After Sachs, odorous substances are collected. The fragrance of many fruits—, oranges and lemons—is due to the oils and other matters contained in such receptacles. In Dictamnus frax- inella these are developed as follows : two mother-cells {p, p, Fig. 116) appear in the hypoderma and divide by several partitions, fo
. Botany for high schools and colleges. Botany. Fig. 115.—Transverse sections of young stem of Ivy {Eedera helix). A, young in- tercellular gum canal, surrounded by four cells ; c, cambium; ivb, soft bast ; E, fully developed canal, g ; b, bast; rp, cortical parenchyma, x 800.—After Sachs, odorous substances are collected. The fragrance of many fruits—, oranges and lemons—is due to the oils and other matters contained in such receptacles. In Dictamnus frax- inella these are developed as follows : two mother-cells {p, p, Fig. 116) appear in the hypoderma and divide by several partitions, forming a mass of thin-walled secreting cells (Fig. 116, B); these, by a degeneration of their walls, fuse into a common cavity filled with oil and watery matter (Fig. 116, C). It appears that the outer layer of secreting cells {('-, c) is developed from the epidermis (Fig. 116, A, d, c); hence this is partly an epidermal structure. Of like nature are the reservoirs in the ^' glandular hairs " of the same plant ; in fact, the two structures are apparently. 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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