215 



Qlucosideg. 



480. AMTDALIN. GSJO H 27 NO U , 3H 2 0. 



a. Crystalline powder. 



Note. Obtained from bitter almonds by treatment with alcohol. It 

 is resolvable into glucose, hydrocyanic acid and hydride of benzoyl. 



481. AEBUTIN. C^ H 3S 14 , H 2 0. 



a Acicular crystals. 



Note. Obtained from the leaves of Arbutui, Uva-wti. It is resolvable 

 by acids into hydrokinone and glucose. 



482. COLOCYNTHIN. C 63 H gl Cos- ? 



a. Powder. 



Note. This glucoside is resolvable, according to Walz, into colocyn- 

 thein and glucose. See Pharmacographia, p. 264. 



483. CONVOLVCLIN. C^ H 56 16 . (Scammonin.) 



a. Powder. 



Note. This specimen was prepared from the Museum specimen of 

 Tampico jalap, by a student in the laboratory of the Society, who found 

 that 100 grains of dense heavy root yielded 7-56 grains ; and 100 grains 

 of light root yielded 11-35 grains of resin, entirely soluble in ether. 



6. Prepared from Scammony. 



Note. Convolvulin is the jalapin of Gmelin (see Handbook, rvi., 

 p. 405) and of Mayer. It is also the jalapin usually met with in English 

 commerce. See Pharmacographia, p. 401. It is distinguished from 

 the jalapin of Vera Cruz jalap by being soluble in ether. 



c. Pure, in vitreous colourless scales. 



d. Brownish extractive, prepared from jalap resin. 



484. COUMARIN. C 9 H 6 2 . 



a. In opaque white crystals. 



Note. The exact chemical constitution of this body not having been 

 satisfactorily settled, it is placed here for convenience only. 



485. CUBEBIN. C 33 H 34 10 . 



a. Small crystals. 



486. DIGITALIN. C^ H 45 15 . 



a. In porous mamillated masses. 

 Note. This glucoside is resolvable into digitaliretin and glucose. 



487. ELATEBIN. C^E.^0^. 



a. Crystalline powder. 



Note. This body does not always yield glucose by treatment with acids, 

 and is probably not a true glucoside. See Attjidd, Chemistry, p. 468. 



488. GLYCVRRHIZIN. C 34 H 36 O 9 . ? 



a. Yellowish powder. 



Note. This substance when pure is insipid. It possesses the properties 

 of an acid, and occurs, combined with ammonia, in the root. See P. J. 

 (3), vol. vi., p. 63, Pharmacographia, p. 159. 



