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SELECTED ARTICLES. 
have placed this bark among the genuine Cinchonas. It is 
also called, by some pharmacologists, Surinam bark. 
Characters. — It occurs in flat or arched pieces, or even 
quills sometimes a foot long: its epidermis is smooth, whitish, 
with few cryptogamic plants, with transverse cracks or 
fissures. The general color of the bark is pale red, but which 
becomes deeper by exposure to the air. It has an astringent 
somewhat bitter taste. In general appearance it has no re- 
semblance to any other Cinchona barks (true or false) that I am 
acquainted with. 
Botanical history. — I have already mentioned the facts 
from which we infer its origin from the C. oblongifolia. 
Chemical history. — It has been analysed by Pelletier and 
Caventou, with the following results: 
A fatty matter. 
Kinovic acid. 
A red resinoid matter. 
Astringent matter. 
Gum. 
Starch. 
Yellow coloring matter. 
Alkalescent matter in very small quantity. 
Lignin. 
5. Other Red Barks with a white epidermis. 
Among the red bark of commerce we frequently find 
samples having "a white epidermis. This is the kind called 
by Guibourt Quinquina rogue a epiderme blanc et micace. 
There is another paler kind which he terms Quinquina rogue 
pale. 
Div. II. — False Cinchona Bark. 
Under this division are placed those barks which have been 
introduced into commerce as Cinchonas, but which are not 
obtained from any species of Cinchona. Their physical cha- 
racters are for the most part very different from those of the 
genuine: moreover, they are not known to contain quinia, 
cinchonia, or aricina. I do not intend to describe them, but 
shall content myself with naming, as examples, the Pitaya 
or Bi-colored bark, the Piton or St. Lucia bark, the Carrib- 
bean bark, fyc. 
