500 



BOTANY AND PHARMACOGNOSY. 



other, berberine, occurring to the extent of 3 to 4 per cent, in 

 the form of yellow needles, which are bitter and readily form 

 compounds with acetone, alcohol and chloroform. In addition, 



Fig. 



2 1 g. Transverse section of a part of the rhizome of hydrastis near the cambium: 

 P, parenchyma; S, sieve; C, cambium; T, tracheaa; F, wood fibers. 



the drug contains a small amount of an alkaloid, canadine (tetra- 

 hydro-berberine), and considerable starch. Calcium oxalate is 

 wanting. 



