



68 THE GROWTH AND PARTS OF PLANTS 
One of the plainest signs which the green leaves make 
can be understood if you compare a geranium plant 
oem in the window with one grown out of doors, or 
Fic. 100. Geranium plant showing leaves near 
ends of branches. 

in a glass house where 
the lheht comes in from 
above as well as from 
one side. The ae 
wants to face the light, 
to be in such a position 
on the plant that it can 
get light easily and 
directly on the on 
surface. 
In the maize plant, the 
sunflower, or the mul- 
lein, with erect and 
usually unbranched 
stems, the leaves stand 
out horizontally, so that 
they get light from the 
sky where it is strong- 
est (see Fig. 72). You 
see also that in most cases one leaf is not directly over 
another. They are set so that they do not shade one 
another. If two leaves are in the same perpendicular 
line, one is so much above the other on the stem that 
the slanting light can easily reach the lower one. 
