VEGETABLE POWDERS 



531 



Fig. 196. VANILLA. 



a. Epidermal cells, vertical view, showing crystals of vanillin. 



b. Hypodermal cells. 



c. Epidermis, transverse view. 



d Parenchyma cells with crystals of calcium oxalate, longitudinal view. 

 e. Crystals of calcium oxalate. 

 /. Tracheids. 



