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SELECTED ARTICLES. 
the outer side. When the coating is present, it agrees in 
characters with the coated quilled yellow bark already 
described, in having wrinkles, furrows, and transverse cracks, 
and in the color of the epidermis. 
The inner surface of both quilled and flat pieces is even 
and often almost smooth. On examination, it is seen to con- 
sist of fine closely set longitudinal fibres. Its color is cinna- 
mon brown; the same color is also perceived on the outer side 
of the bark in the places where the coating is removed. 
Botanical history. — It is, I think, still uncertain what tree 
yields the yellow bark of English commerce. It is stated by 
Mutis, that the Cinchona cordifolia yields the Quina 
amarilla, or yellow bark; and hence, in the Pharmacopoeia 
and other works, our yellow bark is stated to be the produce 
of C. cordifolia; but this is an error, arising from the circum- 
stance of the term yellow bark {China flava) being applied 
on the continent to that which we call Carthagena bark; and 
Guibourt tells us that the authentic specimens of the yellow 
bark of Mutis, brought by Humbolt, are, in fact, specimens of 
Carthagena, and not of Calisaya bark. 
Mutis states, that the Quina naranjada (orange Cinchona 
bark,) is obtained from the C. lancifolia; and as many 
persons regard the orange bark of Mutis as synonymous with 
the Calisaya, or yellow bark of English commerce, we find 
that several writers attribute the latter bark to the C. lancifolia. 
Notwithstanding the authority of the persons who have espous- 
ed this opinion, I cannot admit it, since both Bergen and 
Guibourt declare Calisaya bark is not the orange bark of 
Mutis. The former examined the Quina naranjada (C. lan- 
cifolia of Mutis) in Ruiz's collection; the latter the Quinquina 
orangS de Mutis, in the Musium d , Histoire Naturelle at 
Paris. 
Chemical composition. — Pelletier and Caventou have pub- 
lished the following as the constituents of Calisaya, or yellow 
bark: — 
