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SELECTED ARTICLES. 
ART. XLVI.—ON CINCHONA. Extracted from the Lectures of 
John Pereira, Esq., F. L. S. 
Published in the London Medical Gazette. 
(Concluded.) 
(a.) Pale Barks {Cinchona pallida.) 
1. Crown or Loxa Bark. 
History and synonymes. — A bark called Loxa bark has 
been long known in Europe, and was perhaps one of the first 
introduced into this quarter of the world. In all probability 
it was the bark which Horbius, in 1693, denominated Cas- 
carilla della Oja, but which Condamine more correctly 
terms Corteza, or Cascara de Loxa. It is admitted, I be- 
lieve, by all botanists, that this bark was procured from the 
Cinchona condaminea ; but some doubt exists in the minds 
of pharmacologists whether this is the bark now known 
in commerce by the name of Loxa bark. Hayne has pointed 
out some differences between the Loxa bark of commerce and 
a bark found in Humboldt's collection, marked Quina de Loxa, 
and which had been collected from the C. condaminea: the 
peculiar characteristics of the latter are the warty prominences, 
the transverse cracks, which do not form rings, the browner 
tint of the outer surface, and a more astringent taste. A re- 
presentation of this kind of bark is given in Goebel and 
Kunze's " Pharmaceutische W aarenkunde:" and the first 
of these authors tells us, that in a chest of 120 pounds of 
commercial Loxa bark, he could only find three ounces 
corresponding to this true Loxa bark. Bergen does not 
admit the opinion of its being a distinct kind. 
Loxa bark received the name of Crown bark {Cinchona 
corona seu coronalis) in consequence of its use by the royal 
family of Spain. The following anecdote will serve to illus- 
trate this point: — In October, 1804, a Spanish galley, return- 
ing from Peru, was taken by our countrymen off Cadiz. 
Among the treasures found therein were many parcels of 
Cinchona bark, two sorts of which were distinguished from 
