516 VEGETABLE DRUGS 



moniac is occasionally employed externally as a mild counter- 

 irritant, in plasters. Since its volatile oil is eliminated by 

 the bronchial mucous membrane, ammoniac is given intern- 

 ally as a stimulating and slightly disinfecting expectorant in 

 chronic bronchitis with or without excessive secretion. 



Class 4. — Used Mainly for their Stimulant and 

 Diuretic Action on the Kidneys and Genito- 

 urinary Tract. 



BucHU. Buchu. (U. a -P.) 



Synonym. — Buchu folia, B.P. ; feuiles de bucco, Fr. ; 

 buckublatter, buccoblatter, G. 



The leaves of Barosma betulina (Thunberg) Bartling et 

 Wendland and Barosma Crenulata (Linne) Hooker (nat. ord^ 

 Rutacese). 



Habitat— ^oxxih Africa. 



Description. — About 15 Mm. long, roundish obovate, 

 with a rather wedge-shaped base, or varying between oval 

 and obovate, obtuse, crenate or serrate, with a gland at the 

 base of each tooth ; dull yellowish-green ; thickish, pellucid- 

 punctate ; odor and taste strongly aromatic, somewhat mint- 

 like, pungent and bitterish. 



Constittients. — 1, a volatile oil having an odor somewhat 

 like peppermint, 1^ per cent.; 2, a stearopten (Buchu cam- 

 phor or diosphenol, CioHigOa), possessing an odor like pep- 

 permint and in solution in a liquid hydrocarbon, but crystal- 

 lizing on exposure to the air; 3, barosmiu, a glncoside, 

 soluble in ether, volatile oils, diluted acids and alkalies ; 4, 

 gum ; 5, rutin, a bitter substance. 



Dose.—U. & C, 5i.-ii. (30.-60.); D., gr.xv.-xxx. (1.-2.). 



PREPARATIONS. 



Extractum Buchu Fluidum. Fliiid Extract of Buchu. (U. S. P.) 



Made by maceration, percolation and evaporation, so that 1 Cc. = 

 1 Gm of Buchu. 



Dose.— H. &C., §i.-ii. (30.-60.); D., ttixv.-xxx. (1.-2.) 



