. 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 o. Botany; Plants -- United States; Plants -- Canada. FIG. 3. — Hairs and glands ; a, c, simple hairs ; b, branched hair of the mullein ; rf, gland Burmounted by a hair; e, gland at the top of a hair; _/", prickles of the rose. 40. The surface of the epidei*mis is either smooth, or furnished with numerous processes, originating from itself, or from the cellular substance
. 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 o. Botany; Plants -- United States; Plants -- Canada. FIG. 3. — Hairs and glands ; a, c, simple hairs ; b, branched hair of the mullein ; rf, gland Burmounted by a hair; e, gland at the top of a hair; _/", prickles of the rose. 40. The surface of the epidei*mis is either smooth, or furnished with numerous processes, originating from itself, or from the cellular substance beneath it. These are of several classes, namely, glaiids, hairs, prickles, stings, &c. 41. Hairs are minute expansions of the epidermis, consisting each of a single lengthened cell, or of a row of cells, placed end to end, containing air. They are si7n2yle or bra?iched. (Fig. 3.) a. Hairs are occasionally found upon the leaves, stem, and indeed upon any other part. In the cotton plant (Gossypium) they envelope the seed. They give various names to the surfiice, to which they are appended, according to their nature and appearance; thus it is said to be downy, or pubescent, when clothed with soft, short hairs; — hirsute, with longer hairs:—rough, with short, stiff hairs; — tomentose,-when Uiey are entangled and matted; arachnoid, when like cobwebs; — sericeous, when silky;—velvety, when they are short, soft, and dense; — dliate, when long and fringed, like the eyelasli. 42. Stings are tubular and acute hairs, fixed ujion minute glands in the cuticle, which secrete an acrid fluid. By 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. Boston, Crocker & Brewster
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License: Licensed
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Keywords: ., bookcentury1800, bookdecade1840, bookpublisher, booksubjectbotany
