496 POWDERED VEGETABLE DRUGS 



186. (Fig. 178.) SINAPIS (BRASSICA) ALBA. White 

 Mustard. U. S. 



Moderately fine. 



Yellow mustard, E. Weisser Senf, G. Moutarde blanche, Fr. 



The seeds of Sinapis alba L., Cruciferse. 



Light yellowish brown. 



Nearly odorless; disagreeable, somewhat alliaceous odor when 

 moist. 



Very pungent. 



Epidermal cells large, polygonal, vertical walls very thin, contain- 

 ing mucilage. Hypoderm of large collenchymatous cells. A layer of 

 cells rich in proteid matter. A layer of peculiar mechanical cup shaped 

 palisade cells with lower portions of walls very thick, upper part 

 thin. Endosperm cells polygonal, very thin- walled, completely filled 

 with fat and proteid matter. 



Ash 5 per cent. 



For adulterations see black mustard. 



