248 OUR WOODLAND TREES. 
described, and the succeeding veins higher and 
higher on the mid-stem are shorter and shorter, and 
less and less branched as they near the leaf apex. 
Then, filling the spaces between all the principal 
or most conspicuous veins there is a complete 
network of veinlets; and over the heart-shaped 
framework constituting the venation of the Lime- 
leaf is spread the beautiful cellular tissue filled 
with the colouring matter which gives the charm 
of its golden green hue to the tender leaf of this 
delightful Tree. 
