ON A NEW KIND OF COPAIVA BALSAM. 263 
likewise readily soluble in strong alcohol in the cold, in 
ether and in naptha. The alcoholic solution does not pos- 
sess an acid reaction; no precipitate is produced with ace- 
tate of copper ; it is insoluble in potash or ammonia. On 
analysis this resin was found to contain 60,06-59.98 per 
cent, carbon and 8.48-8.27 hydrogen. 
The resin insoluble in alcohol is repeatedly exhausted 
with absolute alcohol, dissolved in ether and separated by 
evaporation ; it has the same color as the preceding one, 
is insoluble in dilute alcohol, and very sparingly soluble in 
boiling absolute alcohol, from which solution it mostly se- 
parates on cooling ; it dissolves readily in ether and naptha. 
The solution is not acid. It is perfectly insoluble in potash 
or ammonia. On boiling these liquids with the resin, they 
become opake, and deposit on cooling the suspended resin. 
The solution of the resin furnishes with acetate of copper a 
slight precipitate. On analysis the resin furnished 81.76- 
82.12 carbon and 10.56-10 48 hydrogen. 
It results from this investigation that this balsam is not 
ordinary copaiva balsam adulterated, but a distinct kind. 
The author had no opportunity of making any experiments 
as to its effectiveness. — Chemical Gazette, from Liebig's 
Annalen. 
