. Bulletin. Forests and forestry -- United States. A CO-AIMINITY OF TREES. 45 its leaves and twigs, and aids in keeping the air about tbeir crowns, and the soil abont their roots, cooler in summer and warmer in winter than it would be if each tree stood alone. (See PI. XXIY.) With the others it forms a common canopy under which the seedlings of all the members of this protective union are sheltered in early youth, and through which the beneficent influ-. FiG. 41.—A forest in Switzerland where the mutual help of the trees is at its best. The Sihlwahl, where this picture was taken, has been well
. Bulletin. Forests and forestry -- United States. A CO-AIMINITY OF TREES. 45 its leaves and twigs, and aids in keeping the air about tbeir crowns, and the soil abont their roots, cooler in summer and warmer in winter than it would be if each tree stood alone. (See PI. XXIY.) With the others it forms a common canopy under which the seedlings of all the members of this protective union are sheltered in early youth, and through which the beneficent influ-. FiG. 41.—A forest in Switzerland where the mutual help of the trees is at its best. The Sihlwahl, where this picture was taken, has been well managed since beiore the discovery of America, ence of the forest is preserved and extended iar beyond the spread of the trees themselves. But while this fruitful cooperation exists, there is also present, just as in a village or a city, a vigorous strife for the good things of life. For a tree the best of these, and often the hardest to get, are water for the roots and space and light for the crown. In all but very dry places there is. 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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