2a 



ILLUSTRATION No. 3 



Extra, stc lar portion 



Stele 



Ex.tr-a stela f portion 



Transverse section of old root of Rice (oryza sativa) X 116 diameters., 

 (a) Centre of root. 

 (6) Outer boundary of central portion (stele). 



(c) Large air passages. 



(d) Outer wall of root. 



The extra stelar tissues include all those between (6) and (d). 



(See para. 2, paye 1 .) 



ILLUSTRATION No. 4. 



Extra stelar portion. 



Stele'. 



Transverse section of root of wheat (Triticum Vulgare) X 116 diameters. 



(a) Centre of root. 



(b) Outer boundary of central portion (stele). 



(c) Outer wall of root. 



(d) Root hairs. 



Note the comparatively poor development of the extra stelar area and the absence" of 

 huge air passages in it. 



(See para. 2, page 1.) 



