OX VARIOUS SPECIES OF CINCHONA. 117 



nest pieces are convoluted, the thickest flat. It is not at all 



astringent. 



Its infusion, made as above, is scarcely coloured; has a Its act ' on Wlth 



A . . . reagents. 



decidedly bitter taste; forms a eopious white precipitate with 



tartarised antimony; precipitates tannin, but not isinglass ; 

 turns iron slightly green ; and does not render the infusion 

 of Loxa bark turbid. This species of cinchona differs from Of little virtue, 

 that of Loxa, and cannot have very striking febrifuge pro- 

 perties. 



Spec. 15. Common peruvian bark. 



This bark is gray externally, and of an ochre red within-. Common bark, 

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

 nesses according to the difference of the pieces; its taste is 

 bitter and astringent. 



Eight grammes, macerated for twenty-four hours in 150 

 grammes of water, gave it a light yellow colour, and a fitter 

 and astringent taste. This infusion precipitated tartarised Its action with 

 antimony, isinglass, and tannin of a yellowish white, and rea g en ^. 

 sulphate of iron green. It reddened litmus paper. 



This bark appears to be the same with the gray, called An excellent 

 superfine, spec. 3. From the properties it exhibited it must febniu £ e - 

 be excellent in fevers, &c. 



Spec. lG. Red bark of Santa Fe. 



This does not appear to differ in any sensible degree from Red bark of 

 that mentioned above by the name of Santa Fe bark, spec. 2. ' Sullte * e * 



Eight grammes, macerated as above, gave an infusion of T ts action with 

 the red colour of Malaga wine, with an astringent taste, and reagents. 

 but little bitterness. It precipitated isinglass brown ; gave 

 no precipitate with tannin or tartarised antimony ; turned 

 sulphate of iron green; and slightly reddened litmus paper. 

 These chemical properties are equally apparent in the Santa 

 Fe bark described above. 



Spec. 17. Yellow bark of Cuenqa, from branches of four or 

 six years old. 



This bark is gray exteriorly, covered with a white lichen, Yellow bark #f 

 of a brown yellow interiorly, having a fibrous fracture, and Cuenca. 

 scarcely any taste. Its infusion is neither bitter nor astrin- 

 gent. 



