VEGETABLE POWDERS 



Fig. 38. ARNICA. Entire plant. 



a. Epidermal cells of leaf. 



b. Trichomes. 



c. Parenchyma, longitudinal view. 



d. Parenchyma, transverse view. 



e. Pollen grain. 



/. Trichome and epidermal tissue of root. 

 g. Parenchyma of root. 

 /;. Porous ducts. 

 i. Spiral ducts. 

 j. Parenchyma. 



