. A civic biology : presented in problems. Biology; Sanitation. OUR FORESTS 109 becomes like a sponge, holding water through long periods of drought. The roots of the trees, too, help hold the soil in place. The gradual evaporation of water through the stomata of the leaves cools the atmosphere, and this tends to precipitate the moisture in the air. Eventually the dead bodies of the trees themselves are added to the organic covering, and new trees take their place. Other Uses of the Forest. - - In some localities forests are used as windbreaks and to protect mountain towns against avalanches.
. A civic biology : presented in problems. Biology; Sanitation. OUR FORESTS 109 becomes like a sponge, holding water through long periods of drought. The roots of the trees, too, help hold the soil in place. The gradual evaporation of water through the stomata of the leaves cools the atmosphere, and this tends to precipitate the moisture in the air. Eventually the dead bodies of the trees themselves are added to the organic covering, and new trees take their place. Other Uses of the Forest. - - In some localities forests are used as windbreaks and to protect mountain towns against avalanches. FOREST REGIONS Forest regions Heaviest forests. The forest regions of the United States. In winter they moderate the cold, and in summer reduce the heat and lessen the danger from storms. Birds nesting in the woods protect many valuable plants which otherwise might be destroyed by insects. Forests have great commercial importance. Pyrogallic and other acids are obtained from trees, as are tar, creosote, resin, tur- pentine, and many useful oils. The making of maple sirup and sugar forms a profitable industry in several states. The Forest Regions of the United States. - The combined area of all the forests in the United States, exclusive of Alaska, is about 500,000,000 acres. This seemingly immense area is rapidly de-. 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 Hunter, George W. (George William), 1873-1948. New York : American Book Company
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