Fig. 71. —I. Transverse section of a vascular bundle in 

 barley stem. (Enlarged 420 diameters.) 



2. Longitudinal section through portion ground-tissue 

 and a vascular bundle along line x in previous figure. 

 a Epidermis and thick-walled ground-tissue cells ; o thin- 

 waited ground- tissue cells; s sieve-tube; c companion- 

 cell of the bast; « annular vessel; v* and v" spiral 

 vessels of the wood ; r intercellular space. 



