248 
SELECTED ARTICLES. 
speaking of the barks individually. These reasons induce 
me to omit any notice of individual species. 
Geography. — It is a most remarkable circumstance, that 
hitherto no Cinchonas have been found except in Peru and 
Colombia, Some writers, indeed, have described plants 
which they have termed Cinchonas, growing in other parts of 
the world, but subsequent examination has shown them to be- 
long to other genera. Thus three species of Remijia, growing 
in the Brazils, have been described and figured by M. Aug. 
de Saint Hilaire, as species of Cinchona. The Cinchona 
excelsa of Roxburgh, a tree growing on the coast of Coro- 
mandel, is now placed in the genus Hymenodyction. The 
Cinchona Caroliniana of Poiret,is in fact a species of Pinkneya. 
The true Cinchonas extend from 20° south, to 11° north 
latitude, on the Andes, at varying elevations. It is difficult to 
assign limits to these elevations, since the statements of Hum- 
boldt on this subject are not uniform. Thus the lowest true 
Cinchonas are variously stated, by himself and Kunth, to 
grow at an elevation of from 200 toises (1200 feet) to 359 
toises (2154 feet;) while the highest are said to grow from 
1487 toises (8922 feet) to 1680 toises (10,080 feet.) The tem- 
perature of the Cinchona districts necessarily varies with their 
latitude; perhaps the average is about 68° F. 
Method of obtaining Cinchona barks. — " The Indians," 
says Mr. Stevenson, " discover from the eminences where a 
cluster of the trees grow in the woods, for they are easily dis- 
cernible by the rose-colored tinge of their leaves, which 
appear at distance like bunches of flowers amid the deep-green 
foliage of other trees. They then hunt for the spot, and, 
having found it out, cut down all the trees, and take the bark 
from the branches:" and he adds, u after the Indians have 
stripped off the bark, they carry it in bundles out of the wood 
for the purpose of drying it." 
This account of the method of procuring these barks is 
somewhat different from that published many years ago by Mr. 
Gray, from the papers of the late Mr. Arrot. The latter tells 
us that the bark is cut from the trees as they stand. Every 
