. Foundations of botany. Botany; Botany. LIVING PARTS OF THE STEM 109 Examine longitudinal sections of some of the twigs, the potatoes, and the roots. In drawing conclusions about the channels through which the ink has risen (those through which the newly absorbed soil-water most readily trav- els), bear in mind the fact that a slow soakage of the red ink will take place in all directions, and therefore pay attention only to the strongly colored spots or lines. What conclusions can be drawn from this experiment as to the course followed by the sap ? From the familiar facts that ordinary for- e
. Foundations of botany. Botany; Botany. LIVING PARTS OF THE STEM 109 Examine longitudinal sections of some of the twigs, the potatoes, and the roots. In drawing conclusions about the channels through which the ink has risen (those through which the newly absorbed soil-water most readily trav- els), bear in mind the fact that a slow soakage of the red ink will take place in all directions, and therefore pay attention only to the strongly colored spots or lines. What conclusions can be drawn from this experiment as to the course followed by the sap ? From the familiar facts that ordinary for- est trees apparently flourish as well after the almost complete decay and removal of their heartwood, and that many kinds will live and grow for a consider-. able time after a ring of Fig. 77. — Channels for the Movement of Water, upward and downward. bark extending all round rte heavy black Imes in roots, stems, and leaves show the course of the fihro-vascular bundles through which the principal move- ments of water take place. the trunk has been re- moved, it may readily be inferred that the crude sap in trees must rise through some portion of the newer layers of the wood. A tree girdled by the removal of a ring of sapwood promptly dies. 118. Downward Movement of Liquids. — Most dicoty- ledonous stems, when stripped of a ring of bark and then. 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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