CAPE ALOES 565 



emits a fragrant saffron-like odor ; taste peculiar, strongly 

 bitter. Almost entirely soluble in alcohol and in 4 parts of 

 boiling water. The aqueous solution becomes turbid on 

 cooling and yields a deposit. 



The color of socotrine aloes is lighter, and it is less 

 opaque than Barbadoes aloes. The powdered socotrine aloes 

 is brighter and redder, and the odor less disagreeable than 

 that of Barbadoes aloes. 



Aloe Capbnsis. Cape Aloes. (Non-official.) 



Synonym. — Aloes der Cap, Fr. 



Habitat. — Africa. 



Properties. — Occurs in dark-brown or olive-green resin- 

 ous masses; fracture conchoidal; odor strong, sour and 

 disagreeable. Yields a gamoge-yellow powder. Solubility 

 same as socotrine aloes. Product of several varieties of aloes 

 obtained from Cape Town and Natal. 



Dose of Aloes.— R., |ss.-i. (15.-30.); C, §i.-ii. (30,-60.); 

 SL, 3ss.-i. (15.-30.); Sw., 3ii.-iv. (8.-15.); D., gr.xx,-3i. 

 <1.3-4.). 



Constituents. — 1, aloin ; 2, a resin ; 3, a volatile oil ; 4i a 

 trace of gallic acid. 



Aloinum. Aloin. (U. S. & B. P.) 



Synonym. — Aloine, Fr. 



A neutral principle obtained from several varieties of 

 aloes, chiefly Barbadoes aloes (yielding Barbaloin), and 

 Socotra or Zanzibar aloes (yielding Socaloin), differing more 

 or less in chemical composition and physical properties 

 according to the source from which it is derived. 



Derivation.— Ohi&medi by pulverizing and macerating 

 Barbadoes aloes in cold water, and evaporating the resulting 

 solution in vacuo. Aloin crystallizes out and is dried 

 ■between folds of bibulous paper. It is purified hy repeated 

 solution 'in hot water, filtration, recrystallizatiou, and finally 



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