. Bulletin. Forests and forestry -- United States. 54 A PRIMER OF FORESTRY. l^rocess is called natural i)ruuiDg, and from the time uheu it begins the existence of the young forest, unless it should be overtaken by fire or some other great calamity, is i)ractically se- cure. GROWTH IN HEIGHT. At this time, as we have seen, the crowns of all the young trees are growing faster at the tops than at the sides, for there is unlimited room above. (See fig. 51.) But some are growing faster than others, either because their roots are more devel- oped or in better soil thau those of the trees about them,
. Bulletin. Forests and forestry -- United States. 54 A PRIMER OF FORESTRY. l^rocess is called natural i)ruuiDg, and from the time uheu it begins the existence of the young forest, unless it should be overtaken by fire or some other great calamity, is i)ractically se- cure. GROWTH IN HEIGHT. At this time, as we have seen, the crowns of all the young trees are growing faster at the tops than at the sides, for there is unlimited room above. (See fig. 51.) But some are growing faster than others, either because their roots are more devel- oped or in better soil thau those of the trees about them, because they have been freer from the attacks of insects and other ene- mies, or for some similar reasons. Some trees have an inborn tendency to grow faster thau others of the same species in the same surroundings, just as one son in a family is often taller tlian the brothers with whom he was brought Fig. 51.—Large saplings and small poles. Western Larch and Western White Pine. Priest Pdver Forest Heserve, Idaho. Rapid growth in height, from whatever cause it pro- ceeds, brings not only additional light and air to the. 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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