A VENA SATIVA. 185 



sheath sometimes an intercellular cavity formed 

 by breaking in growth. 

 d. Toward the peripheral side of the bundle a group 



of thin- walled conducting cells." 

 c. Draw the bundle. 

 /. Compare the structure of the smaller bundles with 



the foregoing, noting differences. 



Cut a number of longitudinal sections of the stem, and 

 examine with a high power. Study 



9. The epidermis. Note 



a. The thickened outer wall ; elongated shape; chan- 

 nel pits. 



b. The alternately long and short cells in some 

 sections. 



c. Draw. 



Some of the sections will be likely to pass through a 

 stoma. Examine 



d. The guard cells ; note the enlarged ends and nar- 

 row body. Draw. 



10. The hypoderma ; note the extreme elongation and 

 tapering ends of the cells. Draw. 



11. The chlorophyll-bearing cells ; note their shape, arrange- 

 ment and contents. Draw. 



12. The futidamental parenchyma; note the size and 

 shape of the cells, and the thin places in the walls. 

 Draw a few cells. 



13. The fibro-vasciilar bundles ; note in the various sec- 

 tions ia 



a. The slightly thickened, sparsely pitted, elongated 



11 Unstained with magenta. 



'-' No one section can be found to show all points. 



