THE TRANSPORT OF WATER IN THE PLANT 73 
ments, as they are in the root (fig. 59). These delicate cells 
are also in contact with the special parenchyma of the leaf, 
which is in part very loosely arranged and provided with a 
great development of the intercellular space system (fig. 
60), which we have seen to be characteristic of the whole 
Fic. 59,—ENDING oF A FIBRO-VASCULAR BUNDLE IN THE 
PAaRENCHYMA OF A LEAF. 
of the tissue of the plant. The cells abutting on the 
bundles are filled, like the root-hairs and the cells of the 
cortex, with a watery sap which contains substances possess- 
ing a relatively high osmotic equivalent. The woody 
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Fic. 60.—TRANSVERSE SECTION oF THE Brave or a Lear, SHOWING 
THE INTERCELLULAR SPACES OF THE INTERIOR. x 100. 
elements of the veins are not completely empty; their 
walls, at any rate, are saturated with the water ascending 
from the roots. We have consequently here a resumption 
of the osmosis which we noticed to play so conspicuous a 
