. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Inner Structure of the Plantlet. 53 The age of a given part of the stem of a woody plant is ap- proximalelj- inilicateJ bj' the number of its wood rings.* 72. The Vital Part of Woody Stems in plants hav- ing more than one cotj'ledon (46) is limited to a compara- tively thin la3-er of bark and wood, of which the cambium forms the center. The cells of the so-called heart-wood, and those of the dry and furrowed outer bark, have lost their pro- top
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Inner Structure of the Plantlet. 53 The age of a given part of the stem of a woody plant is ap- proximalelj- inilicateJ bj' the number of its wood rings.* 72. The Vital Part of Woody Stems in plants hav- ing more than one cotj'ledon (46) is limited to a compara- tively thin la3-er of bark and wood, of which the cambium forms the center. The cells of the so-called heart-wood, and those of the dry and furrowed outer bark, have lost their pro- toplasm, and so are no longer alive, though they serve a use- ful purpose in adding strength and protection to the vital la5'er. The heart-wood of a tree may largely decay without material- ly interfering with the vital pro- cesses. (Fig. 21). 73. The Healing of Wounds. Cambium cells ex- posed to the air, by partial or complete removal of the bark, soon perish, hence growth . „ ,, , Fig. 21. Live poplar tree with hoi- ceases in a part of the stem ^^^ ^^^^^^ ^^^^,^^ ,^ ^^^, ^^^^^^ thus injured. The uninjured tt»e heart-wood of a tree may decay without destroying its life. MadisoD, cambium cells on the borders of * More than one wood riog is sometimes formed in a season. If growth cease» during the summer from severe drought, or other cause, and is renewed later the same season, an extra ring is 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. : E. S. Goff
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Keywords: ., book, bookcentury1800, booksubjectbotany, booksubjecthorticulture
