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Selected Articles. 
The collecting of cinchonas was at first limited to a small 
district, but the great consumption of this precious bark, that 
has lately taken place, has compelled those employed in that 
trade to extend their researches to wider regions, principally 
in the direction of Carnata and Apollobamba. 
The trees that afford Calisaya bark form thickets or clus- 
ters on the declivities of hills. The collecting of bark is per- 
formed by the neighbouring Indians, who are distributed in 
small tribes, and who, for a small compensation, penetrate 
among a thousand perils into the depths of the forest, fell the 
trees, separate the barks and transport them on their back to 
the neighbouring streams of Chulumanol, Santa Rosa and 
Tarbeni, whence they are directed towards the harbour of 
Islay, and thence to Europe. 
The bark is dried in the sun ; when of considerable thick- 
ness it is loaded with stones in order to prevent its curling, 
and in this state constitutes the fine pieces of flat bark that 
are occasionally found in the seroons. The trees that have 
been felled are apt to emit shoots from the roots ; but a long 
time is required before they are capable of affording good 
barks. This circumstance, together with the natural ob- 
stacles, and the remoteness of the localities which daily in- 
creases, corroborates the apprehension already entertained, 
that a considerable rise in the price of this precious article 
will ultimately take place. 
The three samples, furnished with leaves, flowers and fruit, 
which I have the honor of submitting to your examination, 
belong to very different trees, although the barks afforded by 
them are all introduced in commerce under the common ap- 
pellation of Calisaya bark. This circumstance accounts in 
some measure for the confusion existing among different 
authors respecting the tree that affords the bark. No. 1, is 
produced by the tree called by the Indians Cascarilla yana 
yana, and by the Spaniards Morena, which means deep or 
brown yellow. 
This tree resembles our common poplar, as to thickness 
and height, but is furnished with leaves only at the top. These 
