. Bulletin. Forests and forestry -- United States. SILVICaLTURAL SYSTEMS. 31 The conifers are the more viilual)le, and among them the principal hmiber tree is the spruce. The Bureau of Forestr}^ has found by many careful measurements that if all spruce trees 1:^ inches and over in diameter are cut from certain portions of the Adirondack forest, the younger spruce will grow up and replace the original stand of timber in about twenty 3^ears. But this will not happen unless the. Fig. 18.—Natural forest resembling Localized Selection. Southern Oregon. rules for cutting are faithfully observed, nor
. Bulletin. Forests and forestry -- United States. SILVICaLTURAL SYSTEMS. 31 The conifers are the more viilual)le, and among them the principal hmiber tree is the spruce. The Bureau of Forestr}^ has found by many careful measurements that if all spruce trees 1:^ inches and over in diameter are cut from certain portions of the Adirondack forest, the younger spruce will grow up and replace the original stand of timber in about twenty 3^ears. But this will not happen unless the. Fig. 18.—Natural forest resembling Localized Selection. Southern Oregon. rules for cutting are faithfully observed, nor will it happen more than once unless enough old trees are left standing for seed. Such a forest mav then be divided into twenty parts, and the merchantable timber about 12 inches in diameter mav safelv be cut from one division every a ear. By the time the last of the twent}^ divisions has been cut over, the first will have upon it a stand rtf mature spruce equal in quantit}^ to that of. 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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