. Gray's school et livre de botanique de terrain. Constitué d'un "Leçons de botanique," et "Champ, forêt, et le jardin botanique," lié en un seul volume. Botanique ; botanique. être tendres, fragiles, et détruites par les processus qui la sépare d'utilisation la dure et mince bast-cellules. En Cuir- Wood (Dirca) le bast-CEU sont remarquablement mince. Une vue de l'un, s'agrandie à l'échelle de la Fig. 444, serait un pied et demi de long. 412. Les cellules du bois de pins, et plus ou moins de toutes les autres conifères, sur deux de leurs côtés très curieux de marques en forme de disque (Fig. 448-450) par qui

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. Gray's school and field book of botany. Consisting of "Lessons in botany, " and "Field, forest, and garden botany, " bound in one volume. Botany; Botany. being tender, brittle, and de- stroyed by the processes which separate for use the tough and slender bast-cells. In Leather- wood (Dirca) the bast-ceUs are remarkably slender. A view of one, if magnified on the scale of Fig. 444, would be a foot and a half long. 412. The wood-cells of Pines, and more or less of all other Coniferous trees, have on two of their sides very peculiar disk-shaped markings (Fig. 448-450) by which that kind of wood is recognizable. 413. Ducts, also called Vessels, are mostly larger than wood-cells: indeed, some of them, as in Bed Oak, have calibre large enough to be discerned on a cross section by the naked eye. They make the visible porosity of such kinds of wood. This is particularly the case with Dotted ducts (Fig. 451, 452), the surface of whicli appears as if riddled vrith round or oval pores. Such ducts are commonly made up of a row of large cells more or less confluent into a tube. Sealariform ducts (Fig. 458, 459), common in Fcras, and generally angled by mutual pressure iu the bundles. Fig. 448. Magnified bit of a pine-shaving, taken pafallel with the silver graia 449. Separate whole wood-cell, more magnified. 460. Same, still more magnified; both sections represented: a, disks in section, 6, in face. Fig. 451, 452. A large and a smaller dotted duct from Grape-Vine.. 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 work.. Gray, Asa, 1810-1888; Gray, Asa, 1810-1888. Elements of botany for beginners and for schools; Gray, Asa, 1810-1888. Field, forest, and garden botany. New York : American Book Co.

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