I—Lower part of )) u / 
stem with aérial roots, 4b” Tl 
the circles (c) represent i is 
roots which have been © 
cut away, the horizon- 
tal bar represents the 
soil surface. 
Fig. 14.—Indian corn. 
105 
II.—Transverse section 
(diagrammatic) of the aérial 
part of a root, showing the 
peripheral ring of mechani- 
cai tissue in the rind P M. 
Internally there is the wood 
which represents the in- 
ternal mechanical tissue 
1M ; the bast or phloém B. 
i ree Jo. of subterranean 
root with no_ peripheral 
ring. 
