. Bulletin. Forests and forestry -- United States. mmmm â ' ,;;. -.*i*^ digested in theleaves. THE COMPOSITIOX OF AVOOD. Wood is made up chiefly of carbon, oxy- gen, and hydrogen. ^^^^1 m. Fig. 10.âBark of the Western Hemlock. "Washington Forest Eeserve. When i)erfectly dry, about half its weight is carbon, and half oxygen and liydrogen, in almost the same proportion as in water. It contains also about 1 part in 100, by weight, of earthy constituents, and nitrogen to the same amount. When wood is burned, all these materials disappear into the air except the earthy con- stituents. N
. Bulletin. Forests and forestry -- United States. mmmm â ' ,;;. -.*i*^ digested in theleaves. THE COMPOSITIOX OF AVOOD. Wood is made up chiefly of carbon, oxy- gen, and hydrogen. ^^^^1 m. Fig. 10.âBark of the Western Hemlock. "Washington Forest Eeserve. When i)erfectly dry, about half its weight is carbon, and half oxygen and liydrogen, in almost the same proportion as in water. It contains also about 1 part in 100, by weight, of earthy constituents, and nitrogen to the same amount. When wood is burned, all these materials disappear into the air except the earthy con- stituents. Now the nitrogen and water taken up by the roots were originally in the air before they reached the ground. It is true, there- fore, that when wood is burned those I)arts of it which came from the air go back into it in the form of gas, came from the soil remain behind in. 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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