LEAF EXPOSURE TO SUN AND ATR. 97 
Figs. 81 and 82 show the remarkable difference in arrangement 
in different branches of the Deutzia, and equally interesting 
Fig. 83. — Leaf of Castor-Oil Plant, seen from above, showing exposure 
to sunlight. (Much reduced.) 
modifications may be found in alternate-leaved trees, such as 
the elm and the cherry. 
