I- Lower part of 

 stem with aerial roots, 

 the circles (c) represent 

 roots which have been 

 cut away, the horizon- 

 tal bar represents the 

 soil surface. 



II. Transverse section 

 (diagrammatic) of the aerial 

 part of a root, showing the 

 peripheral rinp of mechani- 

 cal tissue in the rind P M 

 Internally there is the wood 

 which represents the in- 

 ternal mechanical tissue 

 1 M the bast or phloem B. 



III. Do. of subterranean 

 root with no peripheral 

 ring. 



B 



Fig. 14. Indian corn. 

 105 



