. 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. 22 ELEMENTARY ORGANS. This occurs in the prickles of the rose, the stoues of tlie plum, peach, &e., and in the albumen of seeds. /. In some plants, as in the Turkey rhubarb, &c., little bundles of crystals called raphides (from the Gr. pa<pide^, sewing needles,) are formed in the FIG. 1. — Forms of tissue ;
. 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. 22 ELEMENTARY ORGANS. This occurs in the prickles of the rose, the stoues of tlie plum, peach, &e., and in the albumen of seeds. /. In some plants, as in the Turkey rhubarb, &c., little bundles of crystals called raphides (from the Gr. pa<pide^, sewing needles,) are formed in the FIG. 1. — Forms of tissue ; a, cuUmg of elder pith — cellular; t, cells from the gritty centre of the pear; c, from the slone of the plum — both strengthened by solid matter; rf, woody fibre ; e, spiral vessel with a single fibre panly drawn out; /, vessel with a quadruple fibre. 30. Woody tissue, called also fibre, consists of slender, transparent, membranous tubes, tapering to a point each way, and adhering together by then sides, the end of one tube ex- tending beyond that of another, so as to form continuous threads. It differs from cellular tissue, in the greater strength, and, at the same tune, the greater tenuity, of its membrane. It seems de- signed for the transmission of fluid, as weU as for giving firm- ness to those parts which need support. (Fig. 1, d.) a. Tissue of this foiin constitutes the fibre of flax, hemp, &c., the ligneous sub- stance of the stems and roots, the petioles, and veins of leaves, &c. 31. The most remarkable modification of the woody fibre, is that called glandular. It consists of httle gltmdular points, ar- ranged along the walls of the woody tubes. It occurs only in resinous wood, chiefly of the fir tribe (Coniferce). It has fre- quently been detected by the microscope, in fragments of fossil coal, whence it is inferred that coal-beds originated from buried forests of the Coniferas. Witham on fossil vegetables, 4*c. 32. Vasiform tissue consists of large tu
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectbotany, bookyear1848
