The Countess of Chinchon--Introduction of the use of bark into Europe--M. La Condamine's first description of a _chinchona_-tree--J. de Jussieu--Description of the chinchona region--The different valuable species--The discovery of quinine 1 THE VALUABLE SPECIES OF CHINCHONA-TREES--THEIR HISTORY, THEIR DISCOVERERS, AND THEIR FORESTS.…
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