var'wua Species of Cinchona. 41 



t>;/ several excellent physicians, who have obtained f; cm it 

 the happiest results. 



It is gray externaMvj red within, thick, little rolled, hav- 

 ing an astringent and slightly bilter taste. Its inliision has 

 a much redder colour than that of yellow cinchona. Sub- 

 jected to the sanie experiments with the above infusion, it 

 presented the following effects : 



It prccipitatet! the solution of elue in reddish flakes; the 

 infusion of yellow cinchona, in very abinidant red ones; 

 this last effect, which as far as I know has not been aa- 

 nounced bv any person, is worthy of remark. 



It produced no change in the emetic solution : this esta- 

 blishes a difference between this and the yellow bark, whicls, 

 as we have seen above, precipitates very abundantly thi* 

 metallic salt. 



It precipitates the solution of sulphate of iron in a fine 

 deep green ; setisibly reddens tincture of turnsole; is preci- 

 pitated by oxalate of ammonia in oxalate of lime, but^ much 

 less abundantly than the infusion of yellow cinchona. 



It precipitates acetate of lead and sulphate of conper in 

 reddish brown. 



On comparing the pliEnomena produced bv the cinchona 

 of Santa Fii with those of the -yellow bark, we find amonr' 

 them some analogies and several diflcrences. They both 

 precipitate a solution of glue; but the infusion of the yellow 

 cinchona precipitates emetic, and that of the cinchona of 

 Santa-Fe docs not precipitate it : from this it may be con- 

 c'ludtd, that, both of them precipitalingthe other metallic so- 

 lutions, the principle which precipitates copper, iron, lead, 

 &;c. is not the same as that wliich precipitates the emetic ; 

 ■ and that, consequently, the yellow cinchona contains a sub- 

 ttance which is not to be I'ound in the Santa-FO; bark. 



It is evident besides, that, if these infusions were per- 

 fectly similar, no turbid\icss would follow tlieir reciprocal 

 mixrure : there are thereibre in each of these infusions dif- 

 I'.rent substances, which by combining become insoluble. 



Decoction of Savta-Fc Cinchona. 



This decoriion prx)duced the game effects with the rc- 



^izcnts 



