10 



DISPLAY OF LEAVES 



[CH. 



These alterations in the position of the completed 

 leaves, so as to expose as large a surface as possible in the 

 best manner to the air and to the rays of solar light, go a 

 long way towards explaining the peculiarities of foliage. 



Here are a few examples. On the horizontal lateral 



Fig. 1. Erect shoot of Acer platanoides, Norway Maple, viewed from 

 the side and from above ; showing the decussate arrangement and hori- 

 zontal display of the leaves (K). 



