DENSMORD] MEDICINAL CONSTITUENTS OF PLANTS 305 
Rumer crispus. Constituents: Tannin, albumen and iron. 
Sanguinaria canadensis. Constituents: The alkaloid chelerythrine, sanguina- 
rine, gamma-homochelidonine and protopine. 
Sanicula canadensis. Constituents: A resin and an essential oil. 
Silphium perfoliatum. Constituents: Undetermined. 
Solidago rigida. Constituents: A volatile oil. 
Solidago rigidiuscula. Constituents: A volatile oil. 
Stachys palustris. Constituents: An aromatic substance and an alkaloid. 
Stellaria media. Constituents: Saponin. 
Symphoricarpos albus. Constituents: Invertin, a glucoside and emulsin. 
Tanacetum vulgare. Constituents: The bitter principle tanacetin and a vola- 
tile oil. 
Tararacum officinale. Constituents: The bitter principles taraxicin taraxa- 
cerin. 
Thuja occidentalis. Constituents: The coloring matter thujin, the glucoside, 
penipicrin, and a volatile oil containing dutro-pinene, laeyo-fenchone and 
dextro-thujone. 
Trillium grandiflorum. Constituents: Undetermined. 
Tsuga canadensis. Constituents: Resin and a volatile oil which contains laevo- 
pinene and laevo-bornylacetate. 
Urtica gracilis. Constituents: A volatile oil. 
Viburnum acerifolium. Constituents: Probably viburnin and valerianic acid. 
Zanthoxrylum americanum. Constituents: Zanthoxylin and an alkaloid resem- 
bling berberine. 
