366 
Philippine Journal of Science 
1919 
pine and it was thought to be possible to establish the identity 
of guajol and cedrol. 
Camphor oil . — Camphor oil is obtained from camphor wood 
( Cinnamomum camphora Nees et Ebermeyer). A trunk of this 
wood is chopped up and the slices (each piece about 30 to 40 
grams) are extracted by means of steam distillation. The mix- 
ture of steam and camphor vapor is led to a series of wooden 
condensers. As soon as it is cooled with running water, crystals 
of camphor are sublimated under the cover of the condenser and 
a layer of oil appears floating on the surface of the water. 
When the oil is cool, the remainder of the camphor is deposited 
and roughly separated from the oil. These operations are 
carried on in a camp in the mountains. 
The crude camphor oil thus obtained is a yellow or dark 
yellow fluid and emits the characteristic odor of camphor, thus 
proving the presence of the crystals of camphor (specific gravity, 
0.950 to 0.995 at 15° C.). Under ordinary atmospheric pressure 
it distills at from 150° to 270° C., yielding d-pinene, camphene, 
cineol, limonene, camphor, and safrol. 
In the factory of the Monopoly Bureau of the Government of 
Formosa, the crude camphor oil is refined and separated info 
the following fractions: 
It is proved that the residue contains a certain amount of 
safrol. Therefore, the residue is distilled again under low pres- 
sure (200 millimeters) in order to eliminate a fraction which 
contains a considerable amount of safrol (specific gravity, 1.00 
to 1.04). In the beginning of this operation the specific gravity 
increases gradually. After reaching a constant, it decreases 
gradually, showing a number less than 1.00. The oil, the specific 
gravity of which is less than 1.00, is a green or deep blue, viscous 
fluid and is called camphor green oil (specific gravity, about 
0.98; refractive index, about 1.5). Under ordinary atmospheric 
pressure it distills at 210° to 300° C., leaving 3 per cent of pitch. 
Physical and chemical properties of camphor green oil . — 
The samples for the determination of the physical and chemical 
properties of camphor green oil were supplied by the Monopoly 
Bureau of the Government. 
White oil 
Mother liquid of camphor 
Red oil 
Specific gravity. 
0.87 to 0.91 
0.91 to 0.99 
0.99 to 1.035 
