. Bulletin. Forests and forestry -- United States. REQUIREMENTS FOR LIGHT. 31 and moisture than on tlie possession of certain qualities, among which is the ability to bear sliade. With regard to this x)ower trees are roughly divided into two classes, often called shade-bearing and light-demanding, follow- ing the German, but better named tolerant and intoler- ant of shade. (Seefigs. 27, 28.) Tolerant trees are those which nourish under more or less heavy shade in early. Fig. 28.—Heavy cruuiia ..1 a tulciaut 8i»eciL'.s. The Alpine Fir in northern Washington. youth; intolerant trees are those wh
. Bulletin. Forests and forestry -- United States. REQUIREMENTS FOR LIGHT. 31 and moisture than on tlie possession of certain qualities, among which is the ability to bear sliade. With regard to this x)ower trees are roughly divided into two classes, often called shade-bearing and light-demanding, follow- ing the German, but better named tolerant and intoler- ant of shade. (Seefigs. 27, 28.) Tolerant trees are those which nourish under more or less heavy shade in early. Fig. 28.—Heavy cruuiia ..1 a tulciaut 8i»eciL'.s. The Alpine Fir in northern Washington. youth; intolerant trees are those which demand a com- paratively slight cover, or even unrestricted light. Later in life all trees require much more light than at first, and usually those of both classes can live to old age only when they are altogether unshaded from above. But there is always this difference between them: the leaves of tolerant trees will bear more shade. Oonse-. 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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