— 
equally interesting modifications may be found in 
- 142 FOUNDATIONS OF BOTANY 
like those of the horse-chestnut, but they are found to be 
arranged more nearly flatwise along the inner portions 
of the branches, that is, the portions nearer the tree. 
Figs. 109 and 110 show the remarkable difference) in 
arrangement in different branches of the Deutzia, and | 
alternate-leaved trees, such as the elm and the cherry. | 
J 
Fie. 109. — Opposite Leaves of Deutzia! (from the same shrub as Fig. 110), as 
arranged on a Horizontal Branch. 
' 150. Leaf-Mosaics.— In very many cases the leaves at 
the end of a shoot are so arranged as to form a pretty 
symmetrical pattern, as in the horse-chestnut (Fig. 107). 
When this is sufficiently regular, usually with the space 
between the leaves a good deal smaller than the areas of 
the leaves themselves, it is called a leaf-mosaic (Fig. 111). 
Many of the most interesting leaf-groups of this sort (as 
1 Deutzia crenata. 
