. Nature and development of plants. Botany. Fig. 56. Fig. 57. Fig. 56. Diagram of a cross-section of a stem of black oak four years old; p, pith; I, 2, 3, 4, annual rings of xylem; c, cambium cylinder; ph, phloem; cr, cortex; ch, cork; m, medullary rays. Fig. 57. Magnified view of a portion of one of the bands of black oak in Fig. 56, showing the thick-walled summer wood succeeded by the thinner- walled cells and vessels. This association of cells causes the banded appear- ance of the annual rings of growth, m, medullary rays; v, vessels in the spring wood. produces firmer and denser tissues.
. Nature and development of plants. Botany. Fig. 56. Fig. 57. Fig. 56. Diagram of a cross-section of a stem of black oak four years old; p, pith; I, 2, 3, 4, annual rings of xylem; c, cambium cylinder; ph, phloem; cr, cortex; ch, cork; m, medullary rays. Fig. 57. Magnified view of a portion of one of the bands of black oak in Fig. 56, showing the thick-walled summer wood succeeded by the thinner- walled cells and vessels. This association of cells causes the banded appear- ance of the annual rings of growth, m, medullary rays; v, vessels in the spring wood. produces firmer and denser tissues. The age of a tree can gener- ally be ascertained by counting the annual rings. Ho^Yever, two rings may be formed in one season owing to the checking of the growth by fire, severe drouth, depredations of insects and the subsequent recovery and renewal of growth. These annual rings also reveal the life history of the tree, broad bands indi- cating favorable seasons and narrow bands telling of fires,. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
