138 ANATOMY OF STEM, ROOT AND LEAF 



Ex. 67.— Cut sections through the stems of maize, asparagus, or any 

 species of lily : observe with a lens the scattered arrangement of the vascular 

 bundles. 



Fig. 70. — I. Transverse section through a barley stem, b Vascular bundles ; o ground- 

 tissue ; rf hollow cavity. (Enlarged 14 diameters.) 



2. Enlarged view of portion A. a Thick-walled ground-tissue cells and epidermis; 

 thin-walled ground-tissue cells ; /; vascular bundle. (Enlarged about go diameters.) 



