PREFATORY ADVERTISEMENT. 



THE feveral fpceics of die genus Cinchona, 

 from which the Peruvian and other Barks of a 

 fimilar quality arc taken, have been hitherto but 

 little known to the Rotanilb of Europe ; and 

 even the principal fpecics, ihe Cinchona Officina- 

 lis, fo long cftoblifhcd in the practice of Phyfic as 

 one of the happicft of modern difcoverics, was 

 but obfeurcly known till about the year 1738, 

 when Monf. Condaminc elucidated its Hillory, 

 a 2 and 



