Remarks on the Trees Producing Cinchonas. 
327 
leaves are of a velvet green above, and of a purplish colour 
beneath. It affords the fine bark known by the name of Tabla, 
our flat bark, and grows most commonly in fertile soils, on 
the hills of Tipuani, 120 leagues from La Paz. 
Our colleague, Mr. Guibourt, who has devoted a particu- 
lar attention to the study of pharmaceutic drugs, accepted 
the charge of ascertaining the botanical species to which the 
sample belongs. From a careful investigation, and the com- 
parison he has made with the specimens existing in the her- 
barium of Ventenat, he has come to the conclusion that this 
sample belongs to the Cinchona micrantha. 
Specimen No. 2, yields the species called by the natives 
Blanca or Amarilaza — pale yellow. The tree that affords it 
resembles our apple tree. Its greatest height is from twelve 
to fourteen feet ; its branches are circular, extending to a con- 
siderable distance so as to form a large head. Its leaves are 
nearly as long, but considerably narrower than the preceding 
species. The size of the fruit is also very different. This 
species is collected especially in the vicinity of Apollobamba, 
in the ravines of Peluchoaco. 
No. 3, is called Amarilla, or yellow bark. This species 
grows on barren mountains, in rocky soils. Its bark is thin- 
ner, and its leaves smaller, than the preceding species. 
The specimen No. 4, appertains to No. 1, and is furnished 
with a certain quantity of fruit. I have vainly endeavoured 
to cause them to germinate, although they appear to have at- 
tained a degree of perfect maturity; but we know that coffee 
and several other plants of the same family easily lose, and in 
a very short time, their germinating power. I wish, however, 
that some of our colleagues would be pleased to repeat my 
experiments. They may be more fortunate than myself, and 
their success is so much more desirable, that the genus cin- 
chona has no living representative in any of the botanical 
gardens of Europe, although it is probable that it might easily 
be cultivated. With a view to fill this vacancy, I caused 
fifty young plants of cinchona to be sent to me from the 
