. A class-book of botany, designed for colleges, academies, and other seminaries ... Illustrated by a flora of the northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Botany; Plants -- United States; Plants -- Canada. 199. The PITH (;«e<:/w//a) (Occupies the central part of the stem.,/ It consists of a hght, spongy mass of cellular tissue, is^ chiefly abundant in young })lants, appears to be serviceable only in the carHer stages of gTowth. It is then pei-\'aded by fluids; but as the plant advances in age, it becomes dry, being fill
. A class-book of botany, designed for colleges, academies, and other seminaries ... Illustrated by a flora of the northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Botany; Plants -- United States; Plants -- Canada. 199. The PITH (;«e<:/w//a) (Occupies the central part of the stem.,/ It consists of a hght, spongy mass of cellular tissue, is^ chiefly abundant in young })lants, appears to be serviceable only in the carHer stages of gTowth. It is then pei-\'aded by fluids; but as the plant advances in age, it becomes dry, being filled with air only, and much diminished in volume, i J ,*. FIG. 25. — Exogens, — oak, fir, &c.; Endogsns, paira (American), Agave, &c. 200. Immediately around the pith is formed the medullary SHEATH, which is a thin, delicate membrane of vascular tissue (33), sending off' a portion of its spiral vessels to the stalk and veins of each leaf.; This, with the leaves, is the only part of exogenous stems which usually contains spiral vessels. 201. The WOOD is composed ofrconcentric 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 fii"st year. One new layer is formed each successive year, during the life of the plant; hence the whoW. 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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Keywords: ., bookcentury1800, bookdecade1840, booksubjectbotany, bookyear1847
