Remarks on the Trees Producing Cinchonas. 325 
platina, treated with nitric acid, caustic potash, &c. which 
according to its action on formic acid must have contained 
1.26 cubic inches oxygen, gave 1.20 cubic inches of carbonic 
acid and a quantity of water. The carbon arises from the 
zinc, and has no influence on the oxyphoric properties of the 
platina. It may be remarked, that platina precipitated by 
zinc is better fitted for the acetification of alcohol, than that 
obtained by means of organic substances, as it has more 
density. — Journ. de Pharm. 
ART. LXV. — REMARKS ON THE TREES PRODUCING CINCHONAS. 
By Auguste Delondre. 
Notwithstanding the important researches made to ascer- 
tain the botanical species or varieties to which the various 
barks introduced in commerce belong, there still exists a 
great confusion not only in the particulars of this interesting 
part of the history of drugs, but even in the fundamental facts 
relating to them. Thus the latest and most valuable works 
upon materia medica, refer the Calisaya bark, the one to 
Cinchona lancifolia, the other to C. nitida, &c. &c. 
Impressed by these discrepancies, and with a view to throw 
some light upon a subject still so obscure, I present to the 
Pharmaceutical Society several samples of cinchonas, and 
sundry particulars which I have been enabled to obtain 
through the agency of those whom I have employed for 
several years in the various regions whence this drug is af- 
forded, in collecting cinchonas for my own account. 
The Calisaya bark which is now the only species that has 
acquired much importance in commerce, for its advanta- 
geous employment in the manufacture of sulphate of quinine, 
is collected in the vicinity of La Paz, a town situated at the 
south-east extremity of Peru, on the boundaries of Brazil, and 
the immense regions of La Plata. 
