. Bulletin. Forests and forestry -- United States. 86 A PRIMER OF FORESTRY. beneath the surface of the gToiind. Surface fires are usually far less troublesome, but in either case fires which kill the trees are generally rej)eated again and again until the dead timber is consumed. (See fig. 81 and Pis. XLIV, XLY, XLYI, XLA II.) BACK-FIRING. The most dangerous and destructive forest fires are those which run both along the ground and in the tops r^Z V, ikju^.i^- . â "* 5I.'..-'&'-^Ll_»». Fig. 81.âThe result of recurring fires. The forest fioor has disappeared and the pure white sand.
. Bulletin. Forests and forestry -- United States. 86 A PRIMER OF FORESTRY. beneath the surface of the gToiind. Surface fires are usually far less troublesome, but in either case fires which kill the trees are generally rej)eated again and again until the dead timber is consumed. (See fig. 81 and Pis. XLIV, XLY, XLYI, XLA II.) BACK-FIRING. The most dangerous and destructive forest fires are those which run both along the ground and in the tops r^Z V, ikju^.i^- . â "* 5I.'..-'&'-^Ll_»». Fig. 81.âThe result of recurring fires. The forest fioor has disappeared and the pure white sand. Avhieh looks like snow in the picture, is left without protection. Southern Xew Jersey. of the trees. When a fire becomes intensely hot on the ground it may run up the bark, especially if the trees are conifers, and burn in the crowns. Such fires are the fiercest and most destructive of all. Traveling some- times faster than a man can run, they consume enor- mous quantities of valuable timber, burn fences, build- ings, and domestic animals, and endanger or even destroy human lives. They can be checked only by. 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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