. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). CAUSES OF THE MOTION OF JUICES. 361 cambial tissue, and when new, are very delicate in their walls. Fig. 69 represents a simple apparatus by Sachs for imi- tating the supposed mechanism and process of Root-ac- tion. In the fig., g g represents a short, wide, open glass tube; at «, the tube is tied over and securely closed by a piece of pig's bladder; it is then filled with solution of sugar, and the other end, 5, is closed in s
. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). CAUSES OF THE MOTION OF JUICES. 361 cambial tissue, and when new, are very delicate in their walls. Fig. 69 represents a simple apparatus by Sachs for imi- tating the supposed mechanism and process of Root-ac- tion. In the fig., g g represents a short, wide, open glass tube; at «, the tube is tied over and securely closed by a piece of pig's bladder; it is then filled with solution of sugar, and the other end, 5, is closed in similar manner by a piece of parch- ment-paper, (p. 59.) Finally a cap of India- rubber, K, into whose neck a narrow, bent glass tube, r, is fixed, is tied on over h. (These join- ings must be made very carefully and firmly.) The space within r ^is left empty of liquid, and the combination is placed in a vessel of water, as in the figure. C represents a root-cell whose exterior wall (cuti- cle,) a, is less pene- trable under pressure than its interior, 5/ T corresponds to a duct of vascular tis- sue, and the sur- rounding water takes the place of that existing in the pores of the soil. The water shortly penetrates the cell, C, distends the previously flabby membranes, under the ac- cumulating tension filters through h into r, and rises in the tube; where in Sachs' experiment it attained a height of 4 or 5 inches in 24 to 48 hours, the tube, r, being about 5 millimeters wide and the area of J, 700 sq. mm. When Ave consider the vast root-surface exposed to the soil, in case of a vine, and that myriads of rootlets and root-hairs finite their action in the compai-atively narrow stem, wo must admit that the apparatus above figured gives us a yery satisfactory glance into the causes of bleeding. J /, Digitized by Microsoft®. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
