. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Root and the Soil. 69 root advances through the soil by growth, new root-hairs are formed in front of the older ones, while those farthest back as rapidly die off, so that only a short portion of a rootlet bears root-hairs at any one time. In Fig. 25, root-hairs are visible in the left glass, and in Pig. 5, they may be seen on the hypocotyl of some of the germinating corn grains. In Fig. 27 A, and in Fig. 26, the parts of the root bearing root-
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. The Root and the Soil. 69 root advances through the soil by growth, new root-hairs are formed in front of the older ones, while those farthest back as rapidly die off, so that only a short portion of a rootlet bears root-hairs at any one time. In Fig. 25, root-hairs are visible in the left glass, and in Pig. 5, they may be seen on the hypocotyl of some of the germinating corn grains. In Fig. 27 A, and in Fig. 26, the parts of the root bearing root-hairs are indi- cated by the sand which adheres to these parts. It is usually difficult to see root-hairs of plants growing in the natural soil, but they maj' sometimes be discovered, with the help of a pocket magnifying glass, by carefully removing the soil particles about the j'ounger roots, when their silky network may be seen filling the smaller pores of the soil, or envelop- ing the soil particles. Fig. 28 shows a mag- nified root-hair of the wheat plant, closely Fig. 27, Seed- lings of turDip, showing root- b ai rs. (A f t e r Frank and TEchircli).. Fig. ;i8. Magnified root-ljair of wlieat, in contact witli soil partieVs. (After Sacbs). attached to some particles of soil. The root-hairs are able to take up water f reel}', even from soil that does not appear ver}- wet, because each soil particle is enveloped in a thin la3'er of water (91). Still more interesting is the fact, that rooi-hairs are able to dissolve mineral matters in the soil, by means of excretions, most important of which is carbonic acid, thus permitting the plant to use these matters as 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
