J. Schiel on the Distillation of Common Rosin. 101 
eolophonon is 0°84 at 14° C., its boiling point 97° C. (Barom. 
756); with concentrated sulphuric acid it forms a brown liquid 
from which water separates a green oil, having much the smell 
of Ol. anthos. Chlorhydric acid produces a similar transforma- 
tion. With potassium it gives rise to a lively emission of gas 
and coagulates into a brown-yellow mass. Heated in a closed 
vessel above the boiling point it colors brown and assumes an 
odor of peppermint. 
The composition of colophonon is expressed by the formula 
€, iH, gQ2, 
One hundred parts consist of 
Calculated. 
Found 
Carbon, 99°52 78:90 18-95 79:50 
Hydrogen, 11°85 11°59 1161 1201 
Oxygen, 9°63 951 94 949 
100-00 100-00 100-00 100-00 
The determination of the specific gravity of (vapor of) colo- 
phonon gave the number 5:1, which however I consider merely 
as an approximation. It is remarkable, that this substance, 
Ww. 
The second constituent of the essence of rosin has its boiling 
point at 160° C., and possesses all the chemical ae ope of oil 
e composed o 
87-44 
arbon, a 
Hydrogen, - F is ‘ - - - + 44498 
The formula of oil of turpentine €,H16 requires 
Carbon, ‘. . . : : Se ee 
Hydrogen, - _ a r oi! de dee ane 
100°00 
As it does not seem to have any effect on the oo of polariza- 
Hon, it may be identified with the therebéne of eville. 
ere for some hours, kee ing them covered up. portion of 
the Taw oil that had been heated in the water-bath in contact with 
caustic lime showed the composition €20H2s2 of the resineine 
of Deville and Frémy, viz: 
Calculated. Fonnd. 
- 84°51 
Carbon . " es Ps ih ‘ 84°70 
Hydrog Seni tainty yin: OOO 9°69 
os glia areca * 5°69 561 
Oxygen, - : : 3 . i s él 
100°00 100°00 
