144 
THE VEGETATIVE FUNCTIONS OF PLANTS 
of opposite leaves often do not appear to be opposite each 
other, and are often of very unlike size. Such an arrange- 
ment of the blades forms a leaf-mosaic (Figs. 102 and 103). 
If a leaf is removed from a group, or even if a leaflet is 
V. *' < 
FIG. 103. Leaf-mosaic in the Boston ivy. 
removed from the blade of a compound leaf, the remaining 
leaves or leaflets will alter their positions with reference 
to each other so as to occupy the space most advan- 
tageously and economically (Fig. 104). 
137. Advantages of Power of Adjustment. Very little 
thought will enable one to understand at once the pro- 
