. Plant physiology. Plant physiology. 128 PHYSIOLOGY OF NUTRITION occurring mostly wher transpiration is retarded for some reason, as for example, in the case of the Aroideae and other plants living in moist places (Fig. 80).° (b) Exudation Pressure.—The second condition determining the movement of water in stems is the so-called root pressure, sap pressure, or exudation pres- sure, which produces bleeding. This phenomenon was first investigated by- Hales.^ If a branch is cut from a grapevine in the spring, before the buds open, a watery fluid is extruded from the wound. Hales bound a piece of
. Plant physiology. Plant physiology. 128 PHYSIOLOGY OF NUTRITION occurring mostly wher transpiration is retarded for some reason, as for example, in the case of the Aroideae and other plants living in moist places (Fig. 80).° (b) Exudation Pressure.—The second condition determining the movement of water in stems is the so-called root pressure, sap pressure, or exudation pres- sure, which produces bleeding. This phenomenon was first investigated by- Hales.^ If a branch is cut from a grapevine in the spring, before the buds open, a watery fluid is extruded from the wound. Hales bound a piece of animal bladder over the cut end and found that the sap was excreted with such force that the bladder was much swollen at first and was finally broken. To measure the force with which the sap was extruded, Hales connected the cut end of a branch with. 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 Palladin, Vladimir Ivanovich, 1859-1922; Livingston, Burton Edward, 1875-; Hopping, Aleita, 1890-. Philadelphia, P. Blakiston's Son & Co
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