. A class-book of botany, designed for colleges, academies, and other seminaries. Illustrated by a flora of northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Botany; Plants; Plants. 78 THE STEM. 199. The rrni (medulla) occupies the central part of the si (in. It consists of a light, spongy mass of cellular tissue, is chiefly abundant in young plants, and appears to be serviceable only in the earlier stages of growth. It is then pervaded by fluids; but as the plant advances in age, it becomes dry, being filled with air only, and much dimi
. A class-book of botany, designed for colleges, academies, and other seminaries. Illustrated by a flora of northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Botany; Plants; Plants. 78 THE STEM. 199. The rrni (medulla) occupies the central part of the si (in. It consists of a light, spongy mass of cellular tissue, is chiefly abundant in young plants, and appears to be serviceable only in the earlier stages of growth. It is then pervaded by fluids; but as the plant advances in age, it becomes dry, being filled with air only, and much diminished in PIG. 35. — ExogcriB, — oak, fir, &c.; Endogcns, palm (American), Agave, tec. 42()0. Immediately around the pith is formed the medullary sheath, which is a thin, delicate membrane of vascular tissue. (33), Sending pff a portion of LtS spiral vessels to the stalk and veins of each Leaf. This, with the leaves, is the only part of nous stems which usually contains Spiral vessels. 201. The wood is composed of concentric zones, or layers, pervaded and intersected by the medullary rays (204). The first, or inner layer, together with the pith and medullary sheath, is the product of the first year. One n. w layer is formed each successive year, during the life of the plant; hence 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 Wood, Alphonso, 1810-1881. Claremont, N. H. , Manufacturing Co. , S. Ide, agent
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