34 Observations and Experiments on Peruvian Bark. 
market, is no doubt more frequently obtained by colouring 
low priced yellow bark, than from the product of a distinct 
species. ise 
There is but one species of bark in addition to the Ob- 
longifolia as before stated, producing a red powder which is 
called Rosea, and as that species is seldom or never known In 
our commerce there can be little or no powder produced by 
it, hence, all the inferior kinds of red bark of which there is no 
small quantity to the discredit of those who sell it, evidently 
must be either such of the Oblongifolia as has been ren- 
dered almost inactive, by age, weather, or some other expo- 
sure, or as before surmised, is inferior yellow bark, colour- 
number of the latter. 
The cinchona oblongifolia is the magnifolia of the flora 
Peruviana, and is known in Spain by the name of Colorada, 
and is what constitutes the red bark of commerce ; it occurs 
generally in large thick pieces, being the product of the 
largest tree of the genus cinchona oblongifolia. There are 
two varieties. 
Ist. Colorada Canan, or Quill Red Bark which occurs in 
quills of various diameters, from one fourth of an inch to 
two inches in thickness. The epidermis is white or grey, 
with transversal fissures or warty concretions of a reddish 
color, the interior is of a brick red color, the cross fracture 
short and fibrous, the longitudinal fracture compact and shin- 
ing, the taste not so bitter as that of the calisaya. 
- 2nd. Colorada Plancha, or Flat Red Bark. This bark is 
rections. The fracture very fibrous inside, is of a deep brick 
color, the taste is less bitter than that of the quill, and of 
course much less so than that of the calisaya. 
hese two varieties frequently come in the same seroon, 
and from their appearance are no doubt the product of the 
same species, or perhaps the same tree; the quill being pro- 
duced by the branches and the flat thick pieces from the 
trunk, or the former from young and the latter from older trees. 
