8 4 



BOTANY. 



FIG. 228. FIG, 229. 



Vertical, Transverse, 

 or Longi- 

 tudinal. 



FIG. 232, 

 Valvular. 



EXERCISE XXXIII. 

 Introrse and Extrorse Anthers. 



The projecting side of the anther-cell is called its face, 

 and the opposite side its back, whether the valves are un- 

 equal or not. 



When the valves of the anther are of equal size, the 

 dehiscence will occur laterally (Fig. 235) ; but, if one valve 

 be wider than the other, it will throw the line of dehiscence 



FIG. 233. Face. 



FIG. 234. Back. 



FIG. 235. Lateral 

 Dehiscence. 



nearer to the connective on one side than on the other. 

 These narrowed valves are usually on the face or project- 

 ing side of the anther-cell (Fig. 233). 



