tr 



crushed 

 'bast 



134. Cross-section of a bundle of Corn: (d) duct, (a) annular trachei'd (i. e., with ring- 

 shaped thickenings), (sp) spiral trachei'd (i. e. with spiral thickenings), (wp) wood 

 parenchyma, (si) sieve-tube, (cc) companion cell, (sir) strengthening fibers. 



