190 
J. H. Priestley. 
soil solution into the root hair A, a gradient will soon be established 
in which the concentration of the solutes in the sap of L is greater 
than in the sap of K, which is greater than in the sap of J, etc. 
Fig. 1. 
As a result of an osmotic gradient of this nature water will be 
entering the cells of the periphery of the root and passing towards 
the centre where it will gradually distend the cells of the tightly 
packed parenchyma within the vascular cylinder. 
