This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...begins, of the secondary cortex..-This fact is beautifully shown in the tap-root of a seedling from the field, probably less than one year old, collected on July 14, 1908, and measuring 2 mm. in diameter. In this specimen the cells of the primary cortex were completely filled, as also the outer cells ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...begins, of the secondary cortex..-This fact is beautifully shown in the tap-root of a seedling from the field, probably less than one year old, collected on July 14, 1908, and measuring 2 mm. in diameter. In this specimen the cells of the primary cortex were completely filled, as also the outer cells of the secondary cortex, there being progressively less and less secretion toward the center of the root. The opposite relation was shown by the parenchyma rays, in the cells of which the amounts of rubber were found to be progressively less and less, as one proceeded from the center outward (plate 23, figs. 3,7; plate 40, figs. 2 to 4). In a still younger seedling, perhaps three months old, about 1.2 mm. in diameter, rubber is to be seen only in the cortical cells adjacent to the primary canals and in the few innermost cells of the cortical rays. The amount is so small here that, while it may readily be seen with the eye, the photograph does not differentiate it. HYPOCOTYL. PRIMARY STRUCTURE. The primary cortex consists of six layers of cells, including the endodermis. The epidermis becomes rather strongly cuticularized and many of the cells are papillate, or, more correctly speaking, form short, round-ended trichomes, which are usually one-celled, though two-celled trichomes are found in a few instances (plate 23, fig. 9). The angles of the cortical cells adjacent to the inner faces of the epidermal cells are collenchymatized, but in deeper layers this character is not present. Chloro plasts, few in number, however, are present in the cortical cells. The endodermis is well marked and contains a good many large starch grains. The Casparian spots are readily recognized. The stele (o. 18 mm. in diameter in a hypocotyl 0.53 mm. in diameter) is, ..
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