CASCARA SAGRAPA 



419 



principles; and the neutral principle chrysarobin, which yields 

 chrysophanic acid (see Rhubarb). The bark apparently contains 

 emodin; isoemodin, a principle which is isomeric with emodin, insol- 

 uble in ammonia and resembles a similar principle hi Frangula; a 



PIG. 179. Peeling Cascara bark in Washington forests. Illustrating a method 

 employed in commercial collection, and the dense forest in which the col- 

 lector must work. After Johnson and Hindman. 



principle which yields on hydrolysis syringic acid; a fat consisting of 

 rhamnol arachidate; a bitter principle; several resins; tannin; 

 glucose; starch; calcium oxalate; and ash about 7 per cent, 



