nn.] THE BEAN-PLANT. 79 



e. The cambium zone : made up of cloudy-lookiiig, 

 small, angular, thin- walled cells. 



/. Liber-cells : fusiform and thick-walled. 



g. More parenchymatous cells: containing chloro- 

 phyll. 



h. Epidermis : composed apparently of cubical 

 colourless cells : here and there the opening of a 

 stomate (d. 4. /8.) may be seen. 



Draw the section. 



5. Compare the transverse and longitudinal sections 

 together, making out the corresponding parts in each. 



G. Put on a high power, and examine each of the above- 

 mentioned tissues carefully. 



7. Stain with iodine: Jiote the cell-walls ; the protoplasm 

 — its presence or absence, and relative quantity in 

 the various tissues; the nuclei of the cells; starch- 

 granules in some, stained deep blue by the iodine. 



d. The leaves. 



1. Their form and composition. 



a. Each leaf consists of a number of different parts, 

 viz. : — 



a. The stalk or petiole. 



13. The four to six oval leaflets attached laterally 

 to the stalk. 



7. The pair of small leaf-like expansions (stipules) 

 at the base of the petiole, 



B. The rudimentary tendril terminating the pe- 

 tiole, 



