50 Experiments upon the. 



tannin and emetic an abundant white precipitate, but na 

 precipitate in glue, and a slightly green colour with iron ; 

 it docs not make the infusion of Loxa cinchona turbid. Thi* 

 diflcrs from the Loxa cinchona, and, it would seeui, docs not 

 possess the properties of a febrifuge in any remarkable de- 

 gree. 



Fifteenth Species. — Common Cinchona of' Peru. 



This species is gray externally, of an ochre red internally, 

 and its surface is wrinkled; it is rolled, and of various thick- 

 ness ; its taste is bitter and astringent. 



Eight grammes, infused for 24 hours in 150 grammes of 

 water, communicated a slight yellow colour to it, and a 

 bitter and astringent taste. This infusion precipitates emetic, 

 glue, and fannin, in yellowish-white, and sulphate of iron 

 in green. It reddens turnsole paper. 



This species of cinchona s6ems to be the same as the gray 

 cinchona called superior. According to the properties it pre- 

 sented to me, it ought to be excellent for fevers. 



Sixteenth Species. — Red Cinchona of Santa- Fc. 

 It did not seem to differ perceptibly from that which we 

 described above by the name of Santa-Fe cinchona- 

 Eight grammes of this cinchona, infused like the pre- 

 cedins:, save to the water a red colour like Malaga wine, and 

 a taste not very bitter, but astringent. It precipitates glue in 

 brown, but neither emetic nor tannin ; it greens the sul- 

 phate of iron, and reddens slightly turnsole paper. These 

 chemical properties agree with those of the Santa- Fs^ cin- 

 chona above described. 



Seventeenth Species. — Yellow Cinchona of Cuenc^a; Brandies 

 of four or six Years of Age*. 

 This cinchona is gray externally, covered with a white 

 moss, yellowish-brown internally, having a fibrous fracture 

 and hardly any taste; its maceration is neither bitter nor 

 astringent; precipitates neither emetic, glue, nor tannin; 

 it merely greens sulphate of iron, and precipitates acetate of 

 lead. This cinchona docs not seem to have any febrifuge 

 virtue. 



* It "iccnied to have beon aduUcraterl. 



Ttll'lc 



