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The cascarilleros of South America divide the species into a category of colors, according to the tinge of the bark: there are yellow, red, orange, violet, gray and white cinchonas. The yellow, among which figure the Cinchona calisaya, lancifolia, condaminea, micrantha, pubescens, etc., are placed in the first rank: the red, orange and gray are less esteemed.
Of the tulip-tree and the quassia, it is the bark of the roots that is used. Eminent febrifuge virtues have also been found in the cortical part of the roots of the Cinchona condaminea at Loxa; but it is fortunate, for the preservation of the species, that the roots of the real cinchona are not employed in pharmacy.
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