LEAF-FORMS AND FIGURES. 19 
LESSON IV. 
FORMS AND FIGURES OF LEAVES. 
19. In many kinds of leaves we find the parts at the base 
more or less enlarged backwards, as you see in this picture 
Fig. 22. The Morning-glory. 
of the Morning-glory leaf (Fig. 22). This is the heart- 
shaped, or, more properly, the cordate leaf. It is truly ap 
