48 Experiments Upon the 



tlistUIed, yielded ammonia, and a charcoal weighing 41 ccn- 

 tigroiiimes. 



Tenth Species. — Cinchona which was sold to me vAlhont ainj 

 Name*. 



100 gramme? of this bark, macerated for 24 hours, gave 

 a less deep colour to water than \.\\q cindinna mugnifolia; 

 but it was more bitter and less astringent. It reddened per- 

 ceptibly the tincture of turnsole ; it neither precipitated the 

 emetic nor gall-nuts ; but it precipitated glue, aird nitrate of 

 mercury, and greened the sulphate of iron. 



In general, this species presented all the characters of the 

 cinchona magvifoliay and ought to be ranked in the same 

 class. 



The decoction of the husks of this cinchona presented no 

 difference on maceration, nor did it precipitate emetic. 



Eleventh Species. — True Pitton Cinchona. 



This species of bark, which was given me by M. Solome, 

 apothecary at Paris, has a good deal of resemblance, in co- 

 lour and bitterness of taste, to the cinchona of St. Domingo^ 

 which M. Fourcroy analysed about fifteen years ago. 



100 grammes of this cinchona, treated like the other spe- 

 cies, communicatd to water a blood red colour. Its taste was 

 more bitter and disagreeable than that of the others, (jallated 

 alcohol, emetic, nitrate of mercury, and sulphate of iron, 

 produced abundant precipitates with this solution ; glue pro- 

 duced no change in it. The oxvmuriatic acid precipitated 

 it, which no other acid effected. 



The infusion evaporated left a residue which Was partly' 

 dissolved in alcohol, and communicated to it a fine red co- 

 lour. Tlie portion insoluble in alcohol had a gray colour 

 and an earthy appearance : that which was dissolved pre- 

 sented the same pha^nomena as the infusion from which it 

 •was produced. This .substance yielded anm)onia upon di- 

 stillation. 



• It had all the char.icters of the cinckava wignijolia. 



Cinchonas 



