686 



THE PLANE. 



The Poplar, the Apple, and the 

 Pear have the two halves of the leaf- 

 blade rolled up from the outer margins 

 inwards to the central rib, so that 

 each leal resembles a pair ol scrolls 

 of equal size, linked together, the 

 outside of the scrolls being the back 

 of the leaf-blade. The leaf of the 

 Plane is rolled in a similar manner, 

 but in its case the outside of the 

 scrolls is the upper surface of the 

 blade. As the young leaves are only 

 partially unrolled when they emerge 

 from the bud, this characteristic is very 

 obvious. Buckthorn, Plum, and Willow 

 leaves are rolled up like a spill, or a 

 single scroll, from one edge of the 

 blade only, with the under-surface of 

 the leaf outside. 



THE BRANCHES AND TRUNK. 



A twig of the Plane has the same 

 zig-zag line as is found on the Elm, 

 Hornbeam, Lime, and Beech, and, as 

 in their case, the buds are arranged 

 on it singly. The flat layers of 

 twigs, which are so marked a feature 

 in the ramification of the three trees 

 last-named, are, however, less usual 



