. Bulletin. Forests and forestry -- United States. THE FOOD OF A TKEE. 11 and preparing tlie way for tlie succeeding genera- tion. As tliey stand Together in the forest, the crowns of the trees form a broken shelter, which is usually spoivcn of as the leaf canopy, but which may better be called the cover. (See fig. 8.) THE FOOD OF A TREE. Tlie materials upon which a tree feeds are derived from the soil and the air. The minute root hairs which spring from the rootlets take up water from the ground, and with it various substances which it holds in solution. These are the earthy con- stituents of
. Bulletin. Forests and forestry -- United States. THE FOOD OF A TKEE. 11 and preparing tlie way for tlie succeeding genera- tion. As tliey stand Together in the forest, the crowns of the trees form a broken shelter, which is usually spoivcn of as the leaf canopy, but which may better be called the cover. (See fig. 8.) THE FOOD OF A TREE. Tlie materials upon which a tree feeds are derived from the soil and the air. The minute root hairs which spring from the rootlets take up water from the ground, and with it various substances which it holds in solution. These are the earthy con- stituents of the tree, which reappear in the form of ashes when anj^ i^art of it is burned. The water which tains these materials goes straight from the roots to the leaves, in which a most important process in the feed- ing of the tree takes place. This proc- ess is the assimilation or taking up and breaking up, by the leaves, of carbonic acid gas from the air. It goes on only in the presence ot light and heat, and through the action of chlorophyll, a substance from which the leaves and the young bark get their green color. Plants containing chlorophyll are the chief means by which mineral materials are changed into food, so that nearly all plant and animal life depends upon them. Plant cells. Fig. 5.—CrowB and atem of a young AVestem Larch. Priest Eiver Forest E e .s e r v e, 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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