102 
CALISAYA BARE. 
determine with exactness the limits of the region, are of 
sufficient interest to be noticed here.* Thus after having 
studied it in the whole ancient province of Yungas de la 
Paz, to the north of 1 7° of S. L., I followed it in that of Lare- 
caya or Sorata, then in that of Caupolican or Apolobamba, 
the place of its first discovery. But having arrived in Peru, 
I saw it suddenly cease upon the confines of the valley of 
Sandia ; and in spite of all the care I took, I could not find 
it to the north of these points. There was there a fictitious 
barrier which the plant did not pass, although in appear- 
ance, the neighboring valleys were of the same nature; a 
fact which can hardly be explained, except upon the sup- 
position that the more southern valleys of the province of 
Carabaya were different from the northern ones, in conse- 
quence of the peculiar distribution of the rivers. I believe, 
indeed, that I may state that those of the district indicated, 
belong to a particular group, dependent on the Bolivian 
conformation, and that those of the remainder of the province 
diverged on the contrary by the north from Peru, into the 
upper Amazon. This inexplicable attachment which cer- 
tain plants exhibit for regions natural to them, and espe- 
cially for valleys, is not without example ; and now that 
geographical botany has attracted serious attention, science 
will be more enriched by analogous facts. The great re- 
pute of Calisaya bark has caused it to be so sought for, that 
it is becoming scarce, and there is no doubt but that some 
day it will completely disappear from commerce, and we 
shall be forced to be satisfied with some of the species now 
rejected. Already around inhabited places, it is not seen 
but as a shrub, and if by chance some small tree remains 
* There exists between the Bolivians and Peruvians, a sort of 
rivalry upon the subject of this production. The rumor having spread, 
in fact, that Cinchona calisaya was not produced except in the Bolivian 
territory, the barks collected in Peru, no matter how good, are con- 
stantly valued at a lower price, of which the Peruvians, with reason, 
complain. 
