. Identification of the economic woods of the United States : including a discussion of the structural and physical properties of wood . Wood; Trees. ECONOMIC WOODS OF THE UNITED STATES 19 other. In structure and arrangement they exhibit variations of considerable taxonomic value. For example, in Ilex the fibres are rather thin-walled and marked with spirals and bordered pits, and closely resembling tracheids except for their greater size. In Liquidambar (Plate VI, Fig. 1) the fibres are mostly square in cross section and in rather definite radial arrangement. In. « B Fig. 2.—Typical Wood Cell
. Identification of the economic woods of the United States : including a discussion of the structural and physical properties of wood . Wood; Trees. ECONOMIC WOODS OF THE UNITED STATES 19 other. In structure and arrangement they exhibit variations of considerable taxonomic value. For example, in Ilex the fibres are rather thin-walled and marked with spirals and bordered pits, and closely resembling tracheids except for their greater size. In Liquidambar (Plate VI, Fig. 1) the fibres are mostly square in cross section and in rather definite radial arrangement. In. « B Fig. 2.—Typical Wood Cells. A, Wood fibre with very narrow lumen; B, wood fibre with larger lumen and showing oblique, slit-like simple pits (s. p.); C, end of wood fibre showing saw edge; C, end of wood fibre showing forked structure; D, ends of two tracheids from Pinus showing numerous bordered pits (b. p.); E, Tracheid from Quercus; F, wood-parenchyma fibre, showing individual cells and simple pits (s. p.); G, chambered wood-parenchyma fibres from Juglans, showing crystals of calcium oxalate; H, conjugate parenchyma cells; K, portion of a vessel segment showing simple perforation (p); L, portion of a vessel segment showing scalariform perforation (Sc. p.). Greatly enlarged. Robinia (Plate III, Fig. 3) and Toxyton they are in rather large, compact masses in the late wood, separated by groups or bands of pores and parenchyma. In any wood in which they occur they are most aibimdant in the median portion of the growth ring, and material decrease in the width of a ring is usually at their expense. The ends of most wood fibres are smooth and uniformly. 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 Record, Samuel J. (Samuel James), 1881-1945. New York : J. Wiley & Son
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectwood, bookyear1912
