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The importance of studies on the physico-chemical properties of expressed plant saps, as indices of physiological and ecological relationships, has long been recognized. Such studies have been confined for the most part to the measurement of osmotic pressure, electrical conductivity, and more recently, the percentage of bound water in the expressed sap. This investigation deals with certain physico-chemical properties of expressed plant saps as influenced by age of plant, soil moisture, and the concentration of salts in the soil. The relationship between osmotic pressure of the cell sap and leaf temperature was also studied.

EFFECTS OF THE PHYSICAL ENVIRONMENT ON THE PHYSICO-CHEMICAL PROPERTIES OF PLANT SAPS, AND THE RELATION OF THESE PROPERTIES TO LEAF TEMPERATURE