32 Observations and Experiments on Peruvian Bark. 
ey ance therefore of adopting terms more definite 
to Aekaauiih the several species of Peruvian bark must be 
obvious, and that the botanical nomenclature of these spe- 
cies is imperfect and inadequate, is equally so. The qual- 
tity of Peruvian bark appears to be modified and influenced 
by locality, produced by difference in soil, altitude of situa- 
tion, exposure, or some other circumstances peculiar to the 
location, hence the different provinces of Peru afford bark 
differing —_ materially in their physical characters and par- 
ticularly in the activity of their medical qualities, from which 
circumstances it would appear that a nomenclature derived 
from the names of the provinces in which the different spe- 
cies grow, would be a systematic arrangement. 
The following are some of the most important —— 
which now occur in commerce which I have submitted t 
experiments, and have given to each the comparative x 
portion of quinine and cinchonine which they respectively 
contain. The names which are given to distinguish these 
‘species, are derived from the provinces in which 
they grow, which at present, (in consequence of the confu- 
sion in the botanical history and arrangement of cinchona,) 
is the most direct and certain mode of distinguishing those 
species of bark which now are found in our shops. 
Calisaya Bark—Two Varieties. 
Of sas digi important species there are two varieties in 
comm 
"4st. ‘Colsaga arrollenda, (Quill Calisaya.) This variety is 
in oo ee a from three Laeenters of an inch to an inch and a half 
from a a gS inches to a foot and a half in 
lng The thick and may be readily remov- 
the hark, andl henee you find inthe seroons or cases 
a oes proportion oe of this inert part. It is generally 
mported in seroons weighing about one hundred and fifty 
a and very seldom comes in cases ; it has many deep 
A fissures running parallel, the fracture is woody 
interior Ja a som w col- 
of the peusve principle, nh than. any other bark in com- 
merce, an d consequently may be justly esteemed the best. 
