. Bulletin. Forests and forestry -- United States. THE FORMATION OF WOOD. 19 THE STRUCTURE OF WOOD. Wood is cliietiy made up of very small tubes or cells of various kinds, wliicli have special uses in the life of the tree. Some conduct water from the roots to the crown, some store away digested food, and others merely strengthen the structure of the wood and hold it to- gether. The wood of cone-bearing or coniferous trees. Fig. 19.—Slab sawed lengthwise from a Black Oak. Milford, Pa. The saw passed about midway bet^Yeen the center of the tree and the hark. The line between the heartwood and th
. Bulletin. Forests and forestry -- United States. THE FORMATION OF WOOD. 19 THE STRUCTURE OF WOOD. Wood is cliietiy made up of very small tubes or cells of various kinds, wliicli have special uses in the life of the tree. Some conduct water from the roots to the crown, some store away digested food, and others merely strengthen the structure of the wood and hold it to- gether. The wood of cone-bearing or coniferous trees. Fig. 19.—Slab sawed lengthwise from a Black Oak. Milford, Pa. The saw passed about midway bet^Yeen the center of the tree and the hark. The line between the heartwood and the sap is plainly shown. (like the Pines and Spruces) has but few kinds of cells, while that of the broadleaf trees (such as Oaks and Maples) is much less simple. (Seefigs. 14,16, 20, and Pis. VII-IX.) But in each case some of the cells have thick walls and small openings, and others wide openings and very thin walls. In climates which have regularly one. 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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