JALAP 557 



PREPARATION. 



Resina Scammonii. Resin of Scammony. (U. S. & B. P.) 



Derivation. — Made by solution in boiling alcohol, and precipitation 

 with water. 



Pi^operties. — Yellowish-brown or brownish-yellow masses or frag- 

 ments, breaking with a glossy, resinous fracture ; translucent at the 

 edges; or a yellowish-white or grayish-white powder, having a faint, 

 peculiar odor, and a slight, peculiar taste. Soluble in alcohol, ether, and 

 oil of turpentine. 



Constituents. — Mainly scammonin (C88H166O42), identical with 

 jalapin. 



Dose. — One-half that of scammony. 



Jalapa. Jalap. (U. S. & B. P.) 



Synonym. — Tuber jalapse, P.G.; jalap, radix jalapae, Fr.; 

 jalape, jalapenknoUen, G. 



The tuberous root of Ipomoea Jalapa Nuttall (nat. ord. 

 Convolvulacese). 



Habitat. — Mexico. 



Description. — Napiform, pyriform or oblong, varying in 

 size ; the large roots incised, more or less wrinkled ; dark 

 brown, with lighter-colored spots, and short transverse 

 ridges; hard, compact, internally pale grayish-brown, with 

 numerous concentric circles composed of small resin-cells ; 

 fracture resinous, not fibrous; odor slight, but peculiar, 

 smoky and sweetish ; taste sweetish and acrid. Contains 12 

 per cent, of resin of jalap obtained by solution of jalap in 

 alcohol and precipitation with water. 



Constituents. — 1, a hard resin, chiefly the glucoside jala- 

 purgin ; 2, a soft resin. 



Dose.—D., 3 i.-ii. (4.-8.); Cats, 3 ss.-i. (2.-4); Sw., 3 ii.-iv. 

 (8.-15.). 



PREPARATION. 



Resina Jalapce. Resin of Jalap. (U. S. & B. P ) 



Derivation. — Made by maceration and percolation with alcohol, 

 partial distillation ; precipitation with water ; washing and drying. 



Properties. — Yellowish-brown or brown masses or fragments, 

 breaking with a resinous, glossy fracture, translucent at the edges, or 



