. Foundations of botany. Botany; Botany. LEAP EXPOSURE TO STOT AND Affi 145 much yet to be learned about the meaning and importance of leaf-movements. 153. Cause of Sleep-Movements. — The student may very naturally inquire whether the change to the noc- turnal position is brought about by the change from light to darkness or whether it depends rather upon the time of day. It will be interesting to try an experiment in regard to this. EXPERIMENT XXVI Remove a pot containing an oxalis from a sunny window to a dark closet, at about the same temperature, and note at intervals of five minutes the c
. Foundations of botany. Botany; Botany. LEAP EXPOSURE TO STOT AND Affi 145 much yet to be learned about the meaning and importance of leaf-movements. 153. Cause of Sleep-Movements. — The student may very naturally inquire whether the change to the noc- turnal position is brought about by the change from light to darkness or whether it depends rather upon the time of day. It will be interesting to try an experiment in regard to this. EXPERIMENT XXVI Remove a pot containing an oxalis from a sunny window to a dark closet, at about the same temperature, and note at intervals of five minutes the condition of its leaves for half an hour or Fig. 113.—A Leafaof Aoa«ia. A, as seen by day; B, the same leaf asleep at night. 154. Structure of the Parts which cause Leaf-Motions. — In a great number of cases the daily movements of leaves are produced by special organs at the bases of the leaf- stalks. These cushion-like organs, called pulvini (Fig. 114), are composed mainly of parenchymatous tissue. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
