. Bulletin. Forests and forestry -- United States. 58 A PRIMER OF FORESTRY. topped and retarded trees, whicli often remain in size classes which the dominant trees have lon^* since outgrown, tliere are still many low saplings. Even between the domi- nant trees, in a healthy forest, there are always great differences. In- crease in height is now going on rai^idly among these high saplings, and either in this stage or the next a point is reached when the top- most branches nmke their longest yearly growth, which is one way of saying that the trees make their most rapid height growth as large sap
. Bulletin. Forests and forestry -- United States. 58 A PRIMER OF FORESTRY. topped and retarded trees, whicli often remain in size classes which the dominant trees have lon^* since outgrown, tliere are still many low saplings. Even between the domi- nant trees, in a healthy forest, there are always great differences. In- crease in height is now going on rai^idly among these high saplings, and either in this stage or the next a point is reached when the top- most branches nmke their longest yearly growth, which is one way of saying that the trees make their most rapid height growth as large saplings or small poles. (See PI. XXIX.) Later on, as we shall see, these upper branches lengthen much more slowly, until, in standards and veterans, the growth in height gradu- ally diminishes, and in very old trees finally ceases altogether. NATURAL PRUNING. While the trees are i)ushing ui> most rapidly the side branches are most quickly overshaded, and the process of natural pruning goes on with the greatest vigor. Natural pruning is the reason why old trees in a dense forest have only a small crown high in the air, and why their tall, straight trunks are clear of branches to such. Fig. 56.—Standards and poles of Spruce. White Mountains, New 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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