. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). 276 HOW CEOPS GEOW. and deep longitudinal rifts, and it gradually decays or drops away exteriorly as the newer bark forms within. Corh is one form which the epidermal cells assume on the stem of the cork oak, on the potato tuber, and many other plants. Pith Mays. — Those portions of the first-formed cell- tissue which were intei-posed between the young and orig- inally ununited wood-fibers remain, and connect the pith with the
. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). 276 HOW CEOPS GEOW. and deep longitudinal rifts, and it gradually decays or drops away exteriorly as the newer bark forms within. Corh is one form which the epidermal cells assume on the stem of the cork oak, on the potato tuber, and many other plants. Pith Mays. — Those portions of the first-formed cell- tissue which were intei-posed between the young and orig- inally ununited wood-fibers remain, and connect the pith with the rind. In hard stems they become flattened by the 13ressure of the fibers, and are readily seen in most kinds of wood when split lengthwise. They are especially conspicuous in the oak and maple, and form what is com- monly known as the silver-grain. The botanist terms them pith-rays or medullary rays. Fig. 51 exhibits a section of a bit of wood of the Red Pine, {Finns picea,) magnified 200 di- ameters. The section is made tangential to the stem and length- wise of the wood-cells, four of which are in part represented, h ; it cuts across the pith-rays, M'hose cell-structure and position in the wood are seen at wi, n. Cambium of Exogens.—The growing part of the exog- enous stem is thus found between the wood and the bark, or rather between the fully formed wood and the mature bark. There is, in fact, no definite limit where wood ceases and bark begins, for they are connected by the cambial or formative tissue, from which, on the one hand, wood-fibers, and on the other, bast-fibers, or the tissues 6f the bark, rapidly develope. In the cambium, likewise, the pith-rays Digitized by Microsoft®. 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 Johnson, Samuel William, 1830-1909. New York, O. Judd & company
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
