ON A VARIETY OF CINCHONA BARK. 
ART. LIIL— ON A VARIETY OF CINCHONA BARK. 
By William Procter, Jr. 
A few weeks since a sample of bark was sent to me for 
examination as to its quinia strength, which presented so 
many of the characters of yellow bark, that at the time it 
was not suspected. The sample, amounting to about half 
a pound, consisted of several pieces from two to five lines 
in thickness, four to eight inches long, and more or less 
curved. The epidermis had in most instances been remov- 
ed with here and there prominent portions of a dark, reddish- 
brown colour. The interior surface was of a uniform, dull, 
brownish yellow, the fibres straight, and the terminal spi- 
culse less abundant than in the calisaya. The exterior was 
darker coloured than the interior layers, the whole being 
quite bitter to the taste, and auguring well for its quality. 
After a careful examination, I was not a little surprised 
to find nearly three per cent, of cinchonia, and no evidence 
of quinia, even to the most delicate tests of that alkaloid. 
On mentioning this result to MM. Rosengarten and 
Denis, they informed me that an invoice of bark from Peru 
had been consigned to them, as a new article, and which in 
their hands had not yielded any quinine. At my request, 
they kindly gave me a sample of the bark, and copies of 
letters, etc., giving a history of its introduction here and its 
origin in Peru, with permission to use them. 
The consignment was from a house at Valparaiso, who 
say: u We received from Lima, from Dr. J. Villamil, twelve 
seroons of bark, requesting us to consign the same to the 
United States, that a correct knowledge may be obtained of 
the quality. This gentleman has a perfect acquaintance 
with the article, has been the chief collector and dealer in 
it for many years in Bolivia; and during his present resi- 
