The elements of botany for beginners and for schools . all other Coniferous trees, have on two of their sidesvery peculiar disk-shaped markings (Fig. 44S-450) by which that kind ofwood is recognizable. 413. Duots, also called Vessels, are mostly largerthan wood-cells: indeed, some of them, as in Red Oak,have calibre large enough to be discerned on a crosssection by the naked eye. They make the visible porosityof such kinds of wood. This is particularly the case withDotted ducts (Fig. 451, 452), the surface of whichappears as if riddled with round or oval pores. Suchducts are commonly made up o
The elements of botany for beginners and for schools . all other Coniferous trees, have on two of their sidesvery peculiar disk-shaped markings (Fig. 44S-450) by which that kind ofwood is recognizable. 413. Duots, also called Vessels, are mostly largerthan wood-cells: indeed, some of them, as in Red Oak,have calibre large enough to be discerned on a crosssection by the naked eye. They make the visible porosityof such kinds of wood. This is particularly the case withDotted ducts (Fig. 451, 452), the surface of whichappears as if riddled with round or oval pores. Suchducts are commonly made up of a row oflarge cells moreor less confluent into a tube. Scalariform ducts (Fig. 458, 459), common in Ferns,and generally angled by mutual pressure in I he bundles, Pro. 448. Ma<^iified bit of a pine-shaving, taken pacallei with the silver Separate whole wood-cell, more magnified. 450. Same, still more magnified;both sections represented: a, disks in section, b, in face, Fia. 451, 452. A large and a smaller dotted duct from
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
