320 
SELECTED ARTICLES. 
Botanical history v — According to Bergen, the Ash bark 
is identical with the Cascarillo palido of Ruiz, which is ob- 
tained from the Cinchona ovala of the Flora Peruviana, ana 
which is the C. pubescens of Vahl. 
Chemical history. — No distinct analysis of this bark has 
been made. Here are the results of some experiments made 
to determine the proportion of active principle: — 
Quantity of Active Principle in a Pound of the Bark. 
Quinia. Cincbonia. 
Michaelis $^ tsor f t « ' 4 *S rs - J* S rs - 
1 2d sort . . 80 grs. 12 grs. 
Goebel and Kirst , . 12 grs. none. 
Dark Jish Bark, — False Loxa, — Dark Ten Cinchona 
Under the name of China Pseudo Loxa, or " Dunkele Ten- 
China" Bergen has described a bark which has many of the 
properties of Ash bark, and which is found mixed with the 
Loxa bark of commerce. It is principally distinguished from 
the Ash bark by the irregular longitudinal wrinkles and trans- 
verse cracks, and by its darker color. Guibourt regards it as 
an inferior kind of Loxa bark. Batka regarded ita.s a species 
of Buena; but Bergen says it agrees with a bark in the collec- 
tion of Ruiz, said to be obtained from the C. lancifolia of 
Mutis. 
(b.) Yellow Barks (Cinchona fava.) 
4. Yellow Bark of English Commerce. 
History and synonymes. — Dr. Relph tells us, that in a 
letter received from a Spanish merchant at Cadiz, in Septem- 
ber, 1789, it is stated that the yellow bark had been lately 
known there, and that the first parcel which arrived was tried 
at Madrid, and immediately brought by the king's order, for 
his own use. From this circumstance, it was distinguished 
by the name of royal yellow bark, and on the continent it is 
still known by this appellation. The Germans call it Konigs- 
China, or China regia; the French, Quinquina jaune royal. 
There is another name by which it is frequently known — 
