. Nature-study; a manual for teachers and students. Nature study. TREES 3^9 top each other. The one that succeeds will get most light, and therefore grow the best. In the forest the lower branches of the trees are killed by the shade of other trees, and in time they fall off. The wound left by the branch, the knot hole, generally heals over with a new layer of wood and bark. In the forest the lower branches may not be within thirty. Fig. 158. An Open Grove of Hard Maples. (The trees have rounded crowns, low brandies.) or forty feet of the ground, while in the open the same tree would have had
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. Nature-study; a manual for teachers and students. Nature study. TREES 3^9 top each other. The one that succeeds will get most light, and therefore grow the best. In the forest the lower branches of the trees are killed by the shade of other trees, and in time they fall off. The wound left by the branch, the knot hole, generally heals over with a new layer of wood and bark. In the forest the lower branches may not be within thirty. Fig. 158. An Open Grove of Hard Maples. (The trees have rounded crowns, low brandies.) or forty feet of the ground, while in the open the same tree would have had a short thick trunk with branches growing low, and rounded crown. For the first ten years, the rate of growth of trees is slow. It is most rapid for several decades after this, and slower again later. How long do trees live? That depends upon the species. Some, like the poplars, are short lived, a hun- dred to a hundred and fifty years. Maples and oaks live. 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 work.. Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons