224 SHEPHERD* S P URSE. 



3. Color as contrasted with that of the growing stem. 



4. The root-hairs near the tips of rootlets. 



Make transverse and longitudinal sections of a medium 

 sized root and note the presence and relative importance of 



5. The three tissue regions : 



a. The thin peripheral or cortical region. 



b. The large axial or central cylinder, in which radi- 

 ating lines formed by large ducts can usually be 

 seen in the transverse sections. 



c. A region of loose colorless cells between the other 

 two regions. 



Peel the outer layers from a branching root, and notice 



6. The axis of each rootlet remains attached to the axis 

 of the main root. 



C. THE STEM. Note 



1. Mode of branching. 



2. Surface markings. 



3. The relative lengths of internodes. 



4. Axillary branches or buds. 



Make a transverse section and note 



5 . Three regions : 



a. The peripheral or cortical region. 



b. The narrow median or fibro-vascular region. 



c. The axial or pith region? 



6. The fibro-vascular bundles. Note 



a. Shape and relative size. 



b. The cut ends of the tracheary vessels, as holes 

 through the bundles. 



* Not present in the root. 



