. Bulletin. Forests and forestry -- United States. 30 A PRIMER OF FORESTRY. The silvicultural S3^stem called Pure Selection is ap- plied to forests of this kind. It is used chiefly for protection forests in places where it is desirable to keep the cover ahvays unbroken; elsewhere it is out of place. Under this system the annual in- crease of the forest must be found before the yield can be deter- mined. (See p. 15.) Then the fully mature trees are cut in every part of the forest ever}^ 3"ear. The cost of logging is high, for where single trees are taken here and there, roads or other mean
. Bulletin. Forests and forestry -- United States. 30 A PRIMER OF FORESTRY. The silvicultural S3^stem called Pure Selection is ap- plied to forests of this kind. It is used chiefly for protection forests in places where it is desirable to keep the cover ahvays unbroken; elsewhere it is out of place. Under this system the annual in- crease of the forest must be found before the yield can be deter- mined. (See p. 15.) Then the fully mature trees are cut in every part of the forest ever}^ 3"ear. The cost of logging is high, for where single trees are taken here and there, roads or other means of transport must be very numerous and costly in proportion to the amount of the Fig. 17.—Mimic pure selection forest, showing the mixture of ages. LOCALIZED SELECTION. Logging under the system just mentioned is so ex- pensive as to prevent its application in the United States, except for woods like cherry and black walnut, which have a special and unusual value. But if, instead of taking the yield from every part of a selection for- est, a comparatively small area is cut over each year, the cost of logging may be very greatly reduced. Such a method is admirably adapted to certain forest regions in the United States, as, for example, to the Adiron- dack Mountains of New York, where the forest is com- posed about equally of coniferous and In-oadleaf 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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