. Canadian forestry journal. Forests and forestry -- Canada Periodicals. [PHOTU BY A. IvNliCUTEL Planting on Dominion Forest Reserve. its way through the soil partly by chemical action at the root tips and partly by the force of the growth and development behind, the root system must develop in proportion to the tree crown. If the root is too small it will fail to support the tree and to supply adequate moisture to make up for the transp'ration from the crown. So the cutting back of the roots when trans- planting trees necessitates the cutting back of the crown. And it may be mentioned that th
. Canadian forestry journal. Forests and forestry -- Canada Periodicals. [PHOTU BY A. IvNliCUTEL Planting on Dominion Forest Reserve. its way through the soil partly by chemical action at the root tips and partly by the force of the growth and development behind, the root system must develop in proportion to the tree crown. If the root is too small it will fail to support the tree and to supply adequate moisture to make up for the transp'ration from the crown. So the cutting back of the roots when trans- planting trees necessitates the cutting back of the crown. And it may be mentioned that the small root hairs are the organs of absorption, and, as these are quickly dried out and killed in the sun and air, the roots of trees which are being transplanted should be carefully protected from exposure and be kept moist. While the chief function of the root is to supply moisture, they require air. Even the bald cypress of the southern swamps must push up its great root knees above water to get an opportunity to breathe. The effect of lack of aeration of the roots is noticeable in the fringe of dead trees which surrounds many of the lakes in the lumbering region where the waters have been raised for any length of time above their normal height by lumbermen's dams. Trees accustomed to grow in wet and swampy places develop a spreading and shallow root so as to keep in reach of an air supply. The knowledge of the root structure is important to the forester. Some of the most beautiful theoretical plans for the management of sprvice forests in the Eastern United States by cutting by the selection method were spoiled by failing to remember that the spruce is a shallow rooted tree, and the pleasing stand of seed trees left to pro- vide for reproduction were levelled to the earth by the first windstorm. By what force the water is drawn up through the root and elevated one hundred, two hundred, three hundred feet or more in the air is one of the mysteries of vegetable physics. Atmo
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