POWDERED DRUGS 



PlG. 295. Powdered Senna (India). (X 183.) A, Epidermis, surface view. B, Part of trans- 

 verse _ section of leaf. C, Trichomes. D, Water tubes. E, Crystal fiber. P, Parenchyma cells 

 containing prisms of calcium oxalate. G, Aggregate crystals of calcium oxalate. 



