. Elements of botany. Botany; Botany. LEAF EXPOSUKE TO SUN AXD AIE. 99 124. Experiment 24. —Remove a pot containing an oxalis from a sunny window to a dark closet, and note at intervals of five minutes the condition of its leaves for half an hour or less. • Some plants have the power of directing the leaves edge- wise towards the suu during the hottest parts of the day, allowing them to extend their surfaces more nearly in a horizontal direction during the cooler Fig. 85. — A Leaf of Acacia. A^ as seen by day; Bj the same leaf asleep at night. 125. Vertically Placed Leaves. — Very many
. Elements of botany. Botany; Botany. LEAF EXPOSUKE TO SUN AXD AIE. 99 124. Experiment 24. —Remove a pot containing an oxalis from a sunny window to a dark closet, and note at intervals of five minutes the condition of its leaves for half an hour or less. • Some plants have the power of directing the leaves edge- wise towards the suu during the hottest parts of the day, allowing them to extend their surfaces more nearly in a horizontal direction during the cooler Fig. 85. — A Leaf of Acacia. A^ as seen by day; Bj the same leaf asleep at night. 125. Vertically Placed Leaves. — Very many leaves, like those of the iris, Fig. 34, always keep their principal surfaces nearly vertical, thus receiving the morning and evening sun upon their faces, and the noonday sun (which is so intense as to injure them when received full on the surface) upon their edges. This adjustment is most perfect in the compass-plant of the prairies of the Mississippi basin. Its leaves stand very. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
