. Bulletin. Forests and forestry -- United States. TOLERANCE AND INTOLEEANCE. 33 nndertake in the woods depends so largely upon it. Thus tolerant trees will often grow vigorously under the shade of light-crowned trees above them, while if the positions were reversed the latter would speedily die. (See PI. XYI.) The proportion of differ- ent kinds of trees in a forest often depends on their tolerance. Thus Hemlock some- times replaces ^Yhite Pinein Pennsylvania, because it can grow beneath tliePine, and so be ready to fill the opening whenever a Pine dies. But the Pine can not grow under the He
. Bulletin. Forests and forestry -- United States. TOLERANCE AND INTOLEEANCE. 33 nndertake in the woods depends so largely upon it. Thus tolerant trees will often grow vigorously under the shade of light-crowned trees above them, while if the positions were reversed the latter would speedily die. (See PI. XYI.) The proportion of differ- ent kinds of trees in a forest often depends on their tolerance. Thus Hemlock some- times replaces ^Yhite Pinein Pennsylvania, because it can grow beneath tliePine, and so be ready to fill the opening whenever a Pine dies. But the Pine can not grow under the Hemlock, and can only take possession of the ground when a fire or a windfall makes an oi)ening where it can have plenty of light. Some trees, after being over- shaded, can never recover their vigor when at last they are set free. Others do recover and grow vigorously even after many years of starving under heavy shade. The Eed Spruce, in the Adirondacks, has a wonderful. Fig. 30.—a Pitch Pine, producing seed abun- dantly, as sliown by the numerous cones, but Avith no seedlings beneath it. Fire has run over tlie ground, and tbe surface is very dry. A strong breeze was blowing when the pic- ture was taken. Xew 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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