Abstract
Little is known either of the path taken by water as it moves from the outside of the root to the xylem elements of the stele, or of the barriers which might impede the movement of water. Valuable clues concerning the possible pathways of movement and barriers to the movement of water can be obtained by study of the time course of equilibration of roots immersed in tritiated water, under conditions which prevent transpiration. This equilibration may be diffusional or may be accelerated by protoplasmic streaming, but does not involve a net transfer of water. Philip (2), in his figure 3, gave theoretical curves
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