ON CINCHONA. 
323 
Superkinate of quinia. 
Fatty matter. 
Slightly soluble red coloring matter (red cinchonic.) 
Soluble red coloring matter (tannin.) 
Yellow coloring matter. 
Kinate of lime. 
Lignin. 
Amidine. 
Subsequently to this analysis, cinchonia has been discovered 
in this bark. 
The quantity of quinia and cinchonia contained in this bark 
has been examined by several chemists. The following are 
two sets of results, which, unfortunately, are discordant: — 
MICHAELIS. 
Quantity of Quinia in a, pound of Bark. 
Quilled yellow bark . . . .154 grs. 
Flat uncoated yellow bark . . . 286 
GOEBEL AND KIRST. 
Thin quills 60 
Thick quills and coated flat pieces . 84 
Uncoated flat pieces .... 95 
When I speak of sulphate of quinia, I shall enter more fully 
into this subject. 
(c.) Bed Bark (Cinchona ruba.) 
5. Bed Cinchona Bark of Commerce. 
History and synonymes. — Dr. Fothergill, in a letter to 
Dr. Saunders, states, that in the year 1702, a parcel of bark was 
taken on board a Spanish vessel, and a portion of it fell into 
the hands of a celebrated London apothecary, Mr. D. Pearson. 
According to Dr. Fothergill, it was the red bark. In 1779, 
another Spanish ship, bound from Lima to Cadiz, was taken 
by an English frigate, and carried into Lisbon. Her cargo 
consisted principally of red bark, and was for the most part 
sent to Ostend, where it was purchased at a very low price by 
some London druggists, who, after some difficulty, contrived 
to get it introduced into practice. Such are the circumstances 
