. Foundations of botany. Botany; Botany. KOOTS 49 mainly through the root-hairs. These are delicate, hair- like outgrowths from the epidermis of the root. They are, as seen in Fig. 11, thin-walled tubes, of nearly uniform diameter, closed at the outer end and opening at the inner end into the epidermis-ceU. from which they spring. The relation of each hair to the epidermis-cell is still better shown in Fig. 23, which represents a very young root- hair and a considerably older one. 61. Absorption of Water by Roots. — Many experiments on the cultivation of corn, wheat, oats, beans, peas, and oth
. Foundations of botany. Botany; Botany. KOOTS 49 mainly through the root-hairs. These are delicate, hair- like outgrowths from the epidermis of the root. They are, as seen in Fig. 11, thin-walled tubes, of nearly uniform diameter, closed at the outer end and opening at the inner end into the epidermis-ceU. from which they spring. The relation of each hair to the epidermis-cell is still better shown in Fig. 23, which represents a very young root- hair and a considerably older one. 61. Absorption of Water by Roots. — Many experiments on the cultivation of corn, wheat, oats, beans, peas, and other familiar plants in water have proved that some plants, at any rate, can thrive very well on ordinary lake, river, or well water, together with the food which they absorb from the air (Chapter XII). Just how much water some kinds of plants give off (and therefore absorb) per day will be discussed when the uses of the leaf are studied. For the present it is suffi- cient to state that even an annual plant during its lifetime absorbs through the roots very many times its own weight of water. Grasses have been known to take in their weight of water in every twenty- four hours of warm, dry weather. This absorption takes. Fio. 23. A, a Tery young root-hair; B, a much older one '(toth greatly magnified). e, cells of the epidermis of the root; n, nucleus; s, watery cell-sap; p, thicker protoplasm, lining the cell- 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood, Alice, 1859-1953. Boston, Ginn & Co.
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