ADIANTUM PEDA TUM. 1 1$ 



12. The sclerenchyma, peripheral and axial. 



13. The double band of whitish tissue, consisting of cortical 

 parenchyma, bundle-sheath and fibro-vascular bundle. 



Examine the section with a high power, studying each 

 tissue seen in the transverse section. 



14. The epidermis ; compare the length of its cells with 

 the same in transverse section. Draw a few cells. 



15. The sclerenchyma ; cells elongated with tapering ends. 

 Note the pits and the middle lamella as in transverse 

 section. The mouths of the pits may be seen when a 

 wall extends across a cell. Draw. 



1 6. The cortical parenchyma; as in transverse section 

 except that the cells are elongated. 



17. The bundle-sheath ; the length and narrowness of the 

 cells. 



18. The fibro-vascular bundle ; the two regions distin- 

 guished in transverse section, xylem and phloem. 

 Commencing at the bundle-sheath notice 



a. The phloem parenchyma ; much as in the former 

 section. 



b. The sieve cells ; their great elongation, tapering 

 ends overlapping succeeding ones, and slightly 

 thickened walls. Note the sieve plates on the 

 side walls, looking like irregular thin spots with 

 fine specks in them; or the sections of them on the 

 cut edges of the vessels, as depressions of the sur- 

 face of the wall, paired, one on each side when 

 two sieve vessels are contiguous. 7 



c. The scalariform vessels. Observe 



7 Under a or ^ objective the pores in the sieve plates may be bet- 

 ter seen. Consult Bessey, Botany, fig. 71, p. 81. 



