VEGETABLE POWDERS 



497 



Fig. 178. SINAPIS ALBA. 



a. Epidermal cells with mucilage, vertical view. 



b. Collenchymatous hypoderm. 



c. Proteid and oil bearing parenchyma. 



d. Me'chanical cells, profile view. 



e. Mechanical cells, vertical view. 



/. Endosperm cells, entirely filled with fat and proteid matter. 



