VEGETABLE POWDERS 



369 



Fig. 111. HUMULUS. 



a. Gland (lupulin). 



b. Upper epidermal cells. 



c. Epidermal tissue with stomata. 



d. Trichomes. 



e. Parenchyma with crystals. 



/. Aggregate crystals of calcium oxalate. 

 g. Spongy tissue cells with crystals. 



