various Species of Cinchona. 49 



Cinchonas Irought to Europe ly Messrs. Humluldt and 

 Bonpla7id. 

 Twelfth Species. — Cinchona of Loxa, coming from Branches 

 of two Years of Age, a?id made use of in the Laboratory 

 of the King of Spain. 



It is grav externally, yellowish within, very thin, rolled 

 up, and has a bitter and astringent taste. 



Eight grammes of this bark, infused in 150 grammes of 

 water for 24 hours, at the temperature of 15° (60° Fahr.), 

 yieldi'd a reddish yellow slight-coloured liquid, having a 

 slight musty smell and a bitter taste : it precipitated gall- 

 nuts, emetic, and acetate of lead, in yellowish-white; iroa 

 in blueiih'green ; oxalate of ammonia, while; and glue in 

 large glutinous white flakes. The precipitates formed by 

 glue and by emetic are redissolved in an excess of warm in- 

 fusion. 



According to these properties, this cinchona ought to be 

 accounted an excellent febrifuge. 



Thirteenth Species. — IVhite Cinchona of Santa- Fe. 



This bark has a yellow colour, rusty externally, deeper 

 internally : it is flat and thick ; its fracture resembles that of 

 beech bark ; its taste is neither bitter nor astringent, like that 

 of other cinchonas. 



Eight grammes, infused for 24 hours in 150 grammes of 

 water, gave a deeper yellow colour than the cinchona of 

 Loxa : this infusion does not precipitate gall-nuls, enietic, 

 nor glue : it turns solution of iron green, and precipitates 

 the acetate of lead in brownish yellow. According to these 

 properties, this is not a true cinchona. 



Fourteenth Species. — Orange Cinchona <f Sav.ta-Fi. 



This speck's, which was brought to Europe by Messrs. 

 Humboldt and Bonpland, has a yellow colour like cinna- 

 mon : as this bark has no epidermis, it is thick, and its frac- 

 ture extremely fibrous ; the thinnest pieces are rolled up 

 within each other; the thickest are flat, and it is by no 

 means astringent; its iniusion, made as above directed, 

 is almost colourless ; its taste is decidedly bitter j it gives ia 



Vol. 27. No. 105. Feb. 1807- D tannia 



