50 SUN AND SHADE-LEAVES. [CH. II 



ment of leaf, measured in length and breadth ; length and 

 diameter of stem, and length of internode. 



(73) 8wn and shade-leaves. 



To see the remarkable structural characters described 

 by Stahl', the leaves of the beech will serve. Transverse 

 sections must be cut from leaves which have grown (1) in 

 the fullest sunshine, and (2) in deep shade. The chief 

 point to note is the difference in the palisade tissue. 



1 Bot. Zeitung, 1880. 



