. Bulletin. Forests and forestry -- United States. THE FORMATION OF WOOD. 21 these ducts are scat- tered througli the whole season's growth, and in all conifers, as for example the Pines and Cedars, they are entirely wanting. But the differences in hardness and color between the growth of spring and summer are still present. It is sometimes possible to see the line which separates the growth of two seasons in the bark, as in the case of common cork, which is the outer bark of the Cork Oak, a na- tive of southern Eu- rope. (See ^g. 15.) If the trunk or branch of an Oak tree is cut smoothly acro
. Bulletin. Forests and forestry -- United States. THE FORMATION OF WOOD. 21 these ducts are scat- tered througli the whole season's growth, and in all conifers, as for example the Pines and Cedars, they are entirely wanting. But the differences in hardness and color between the growth of spring and summer are still present. It is sometimes possible to see the line which separates the growth of two seasons in the bark, as in the case of common cork, which is the outer bark of the Cork Oak, a na- tive of southern Eu- rope. (See ^g. 15.) If the trunk or branch of an Oak tree is cut smoothly across, thin whitish lines may be seen run- ning from within out- ward. Some of these lines begin in the cen- ter of the tree, and others in each one of the annual Fig. 21.—A section of the comiuon Staghom Sumach, showing the darkened lieartwood, the white sapwood, and the inner and outer bark. Dark coloring matter is often de- posited in the heartvrood, as in the case here shown. Milford, 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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