36 AALSAM OF COPABIA. 
ART. X .—INVESTIGATIONS CONCERNING A RESIN 
EXTRACTED FROM BALSAM OF COPAIBA. By M. Feh- 
LING. 
The author examined a slightly crystalline deposit formed 
in balsam of copaiba of good quality. He determined the 
composition of this resin in the hydrated and anhydrous 
states. Its atomic weight was deduced from the combus- 
tion of the salts of lead and silver. By analysis, it gave the 
following results. 
HYDRATED RESIN. 
Atoms. 
c. 
= 72.345 
C 40 . 
H. 
= 9.022 
H 6 Q . 
0. 
= 18.633 
8 . 
100.000- 
ANHYDROUS RESIN. 
C. = 76.274 C 40 . 
H. = 8.805 H 5 6 
0. = 14.921 6 . 
100.000. 
The resin is isomeric with the oxysylvic acid of Hess, 
which contains— 
C. = 72.14 
H. == 8.74 
0. = 19.12 
100.00 
This resin, treated by nitric acid, gave rise to two pro- 
