}\Q ON VARIOUS SPECIES OF CINCHONA. 



The portion not soluble in alcohol had a gray colour and 

 earthy appearance. It yielded ammonia on distillation. The 

 portion dissolved exhibited the same phenomena as the in- 

 fusion from which it was obtained. 



Cinchona of different kinds brought from America 

 by Messrs. von Humboldt and Bonpland. 



Spec. 12. Bark of Loxa y taken from branches of the second 

 year, and used by the apothecary to the king of Spain. 



Loxabaik. TJ»W is externally gray, internally yellow, thin, convo- 



luted, and bitter and astringent to the taste. 



Eight grammes of this bark, infused for twenty-four hours 

 in 150 grammes of water at 15° [59° Fj, yielded a reddish 

 yellow liquor not very deeply coloured, having a slightly 

 Its action with mouldy smell, and a bitter taste. It precipitated galls, tar- 

 reagents, tarised antimony, and acetate of lead of a yellowish white, 

 iron of a blueish green, oxalate of ammonia white, and 

 isinglass in large, white, glutinous flocks. The precipitates 

 formed by tartarised antimony and isinglass redissolved in an 

 excess of the hot infusion. 

 Highly febri- From these properties this cinchona must have great fe- 

 Juge. brifuge virtue. 



Spec. 13. White lark of Santa Fe, 



White bark of This bark has a rusty yellow colour externally, which is 



Santa Fe. deeper within. It is flat and thick. Its fracture is granu- 



lated nearly like that of beech bark. Its taste is neither bit- 

 ter nor astringent like that of the other barks. 



Eight grammes macerated for twenty-four hours in 150 

 grammes of water imparted to it a deeper yellow colour than 



Its action with the Loxa barks. This infusion precipitated neither galls, 

 tartarised antimony, nor isinglass; it turned solution of iron 

 green ; and precipitated acetate of lead of a brownish yellow. 



Notacincho- From these properties this bark appears not to be a trne 

 cinchona. 



Spkc. 14. Orange-coloured bark of Santa Fe. 



Orange co- This bark is of a cinnamon yellow colour, without any 



loured bark of epidermis, thick, and very fibrous in its fracture. The thin- 

 Santa Fe. r 



nest 



