. Bulletin. Forests and forestry -- United States. —"Ring-porous" woods—white oak and hickory, , annual ring; su. w., summer wood; 8}). «>., spring wood; v, vessels or pores; c. I., "concentric" lines; rt, darker tracts of hard fibers form- ing the firm part of oak wood; pr, pith rays. (4) Pores, which are vessels cut through, appearing as holes in cross section, in longitudinal section as channels, scratches, or indentations. (See p. 19 and figs. 38 and 39.) They appear only in the broad-leaved, so called, hard woods; their relative size (large, medium, small
. Bulletin. Forests and forestry -- United States. —"Ring-porous" woods—white oak and hickory, , annual ring; su. w., summer wood; 8}). «>., spring wood; v, vessels or pores; c. I., "concentric" lines; rt, darker tracts of hard fibers form- ing the firm part of oak wood; pr, pith rays. (4) Pores, which are vessels cut through, appearing as holes in cross section, in longitudinal section as channels, scratches, or indentations. (See p. 19 and figs. 38 and 39.) They appear only in the broad-leaved, so called, hard woods; their relative size (large, medium, small, minute, and indistinct, when they cease to be visible individually by the naked eye) and manner of distribution in the ring being of much importance, and especially in the summer wood, where they appear singly, in groups, or short broken lines, in continuous concentric, often wavy, lines, or in radial branching lines. (5) Eesin ducts (see p. 16 and fig. 37), which appear very much like pores in cross section, namely, as holes or lighter or darker colored dots, but much more scattered. They occur only in coniferous woods, and their presence or absence, size, number, and distribution are an important distinction in these ar Beech ! Sycamore I Birch. Fig. 39.—"Diffuse-poroua'' •woods, ar, annual ring; pr, pith rays which are '' broad " at a, " fine " at b, "indistinct" at d. (6) Pith rays( and figs. 38 and 39), which in cross section appear as radial lines, and in radial section as interrupted bands of varying breadth, impart a peculiar luster to that section in some woods. They are most readily visible with the naked eye or with a magnifier in 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 United States. Division of Forestry. Washington : G. P. O.
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