. Foundations of Botany. Botany. 110 FOUNDATIONS OF BOTANY stood in water, as shown in Fig. bell-jar, develop roots only at or. 76, and covered with a near the upper edge of the stripped portion,1 and this would seem to prove that such stems send their building ma- terial — the elaborated sap — largely at any rate down through the bark. Its course is undoubt- edly for the most part through the sieve-cells (Figs. 63, 64), which are admirably adapted to Fig. 78. — Diagrammatic Cross-Section of a COnvey liquids. In ad- Bundle from Sugar-Cane, showing Channels dition f q these general for Air and
. Foundations of Botany. Botany. 110 FOUNDATIONS OF BOTANY stood in water, as shown in Fig. bell-jar, develop roots only at or. 76, and covered with a near the upper edge of the stripped portion,1 and this would seem to prove that such stems send their building ma- terial — the elaborated sap — largely at any rate down through the bark. Its course is undoubt- edly for the most part through the sieve-cells (Figs. 63, 64), which are admirably adapted to Fig. 78. — Diagrammatic Cross-Section of a COnvey liquids. In ad- Bundle from Sugar-Cane, showing Channels dition f q these general for Air and Water. (Magnified.) ° .. , , . ^ . .. , upward and downward Air travels downward through the two large -^ ducts d (and the two smaller ones between movements of Sap, there them). Water travels upward through the , , , , » ducts and through the wood-cells in the DlUSt De lOCal tranSierS region marked w. Water with dissolved plant-food travels downward through the sieve-cells in the region marked s. laterally through the stem, and these are at times of much im- portance to the plant. Since the liquid building mate- rial travels straight down the . Fig. 79.—Unequal Growth of Rings Stem, that Side 01 the Stem On of Wood in nearly Horizontal Which the manufacture of Such Stem of a Juniper. (Natural size.) material is going on most rapidly should grow 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. Boston, Ginn & company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
