. The book of forestry. Forests and forestry. 280 THE BOOK OF FORESTRY On cutting across a log in addition to the annual growth rings laid on each year by the cambium layer, grayish lines may be seen extending from the heart to bark. These lines, called ''medullary rays/' are made up. Courtesy H. P. Brown Fig. 64.—Section of a non-porous coniferous wood (sequoia), seen through a microscope. The dark band marks the late summer growth. of thin-walled cells like the pith in the center. In some hardwoods, like oak, sycamore and maple, these medul- lary rays are very broad and conspicuous, especial
. The book of forestry. Forests and forestry. 280 THE BOOK OF FORESTRY On cutting across a log in addition to the annual growth rings laid on each year by the cambium layer, grayish lines may be seen extending from the heart to bark. These lines, called ''medullary rays/' are made up. Courtesy H. P. Brown Fig. 64.—Section of a non-porous coniferous wood (sequoia), seen through a microscope. The dark band marks the late summer growth. of thin-walled cells like the pith in the center. In some hardwoods, like oak, sycamore and maple, these medul- lary rays are very broad and conspicuous, especially when cut along the radius—''quarter-sawed"—which shows them off to best advantage. In the 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 Moon, Frederick Franklin, 1880-1929. New York [etc. ] D. Appleton and Company
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