. The elements of botany for beginners and for schools. Botany. 449 and more or less of all other Coniferous trees, have on two of their sides very peculiar disk-shaped markings (Fig. 44S-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 ])articularly the case with Dotted ducts (Fig. 451, 452), the surface of whicli appears as if riddled with round or o
. The elements of botany for beginners and for schools. Botany. 449 and more or less of all other Coniferous trees, have on two of their sides very peculiar disk-shaped markings (Fig. 44S-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 ])articularly the case with Dotted ducts (Fig. 451, 452), the surface of whicli appears as if riddled with round or oval pores. Such ducts are commonly made up of a row oflarge cells more or less confluent into a tube. Scalari/orm ducts (Fig. 458, 459), common in Ferns, and generally angled by mutual pressure in the bundles, Fig. 448. jNLagnified bit of a pine-shaving, taken parallel with the silver grain. 449. Separate wliole wood-cell, more magnifieil. 450. Same, still more magnified j both sections represented : a, disks in section, b, in face. Fig. 451, 452. A large and a smaller dotted duct from 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 Gray, Asa, 1810-1888. New York : American Book Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
