VEGETABLE POWDERS 



449 



Fig. 153. POPULUS. 



a. Sclerenchyma. 



b. Bast. 



c. Crystal bearing fiber. 



d. Bast and medullary ray (h) (tangential view). 



e. Parenchyma. 



/. Sclerenchymatous bast. 

 g. Parenchyma. 



29 



