74 



TREES IN WINTER. 



materials, are taken into the interior of the tree. 

 A little yellow or red coloring-matter is left behind, 

 and it is this which gives the leaves their bright 

 hues. When they finally fall, they are mere dead 



FIG. 12. FALL OF THE LEAF. HORSECHESTNUT. (" Pflanzenleben.") 



husks, emptied of nourishment, and of no further 

 use to the plant. 



When the leaf falls, a scar is left behind. In 

 plants with compound leaves, like the Horsechest- 

 nut or the Ash, there is a similar scar at the base 

 of each leaflet (Fig. 12). The process which causes 



