n8 MAIDEN-HAIR PERM. 



8. Draw the bundle. 



Take one of the largest roots whose root-cap is present 

 and cut a series of longitudinal sections, mount, treat with 

 potash, and selecting the section which passes through the 

 center of growth, note 



9. The concentric layers of the root-cap, each thickest in 

 the middle, the outer sloughing off. 



10. The tissues at the apex of the root. In the center, im- 

 mediately under the root-cap, a large triangular cell, 

 apex inward, the apical cell. Notice that the cells 

 adjacent to the inner faces of the apical cell have evi- 

 dently been derived from it by partitions parallel to its 

 faces. 



11. Draw the tip of the root, including the root-cap. 



12. The trichomes in the form of root-hairs. Slice off from 

 a root a thin piece carrying a number of hairs, and 

 note 



a. Their attachment to epidermal cells. 



b. The shape of a hair near the proximal and distal 

 ends. 



c. The color of the wall and absence of septa. 



d. The occasional spiral thickenings in the large hairs, 

 usually forming a loose spiral of three or four 

 turns only. 



<?. The contents. 



f. Draw a hair showing these points. 



C. THE LEAVES. 



i. The epidermis. Lift the epidermis of the lower surface 

 of a leaflet with the point of a needle, seize it with fine 

 forceps and strip off as much as possible, mount, 

 examine with high power, and notice 



