EXPOSURE TO LIGHT 239 
The leaves of Corn and other Grasses are good examples of the 
alternate arrangement. In Corn, for example, the second leaf 
appears at the next node above and on the opposite side of the 
stem from the first leaf, and the third leaf appears at the third 
node and almost directly over the first leaf. Usually on account 
of a slight twisting of the stem, the leaf blades do not occur 
Fic. 221. — Tobacco, a plant with the alternate arrangement of leaves. 
After Hayes. 
directly over each other, but extend in slightly different direc- 
tions, so that the lower leaves are not directly in the shade of the 
upper ones. In fruit trees and many other plants having the alter- 
nate arrangement, the second leaf is not quite on the opposite 
side from the first and neither is the third leaf usually over the 
first. (Fig. 221.) The leaves are so arranged that no large open 
spaces appear in looking in from the end of the twig as shown in 
