. Elementary plant physiology. Plant physiology. ii8 Elementary Plant Physiology. insolation in the middle of the day, and from rapid cooling and loss of water at night. The plants used have been accus-. Fig. 88.—Positions of leaflets of bean in daylight and in darkness. After Detmer. tomed to regular alternations of periods of darkness and light until they have acquired a rhythm or habit, in accordance with which the movements will be repeated a number of times, even when kept under continuous darkness or illumi- nation. After a time, however, the rhythm will be lost in many species. After be
. Elementary plant physiology. Plant physiology. ii8 Elementary Plant Physiology. insolation in the middle of the day, and from rapid cooling and loss of water at night. The plants used have been accus-. Fig. 88.—Positions of leaflets of bean in daylight and in darkness. After Detmer. tomed to regular alternations of periods of darkness and light until they have acquired a rhythm or habit, in accordance with which the movements will be repeated a number of times, even when kept under continuous darkness or illumi- nation. After a time, however, the rhythm will be lost in many species. After becoming fully acquainted with the be- havior of the plant used in the above test, place it in sunlight, and raise the temperature of the air around it, or of the soil, and note effect on movements of leaves. 129. Geotropism: reaction to gravity.—Bend over. 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 MacDougal, Daniel Trembly, 1865-1958. New York, London [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1902
