366 Philippine Journal of Science m* 



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 (Z-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 into 

 the following fractions : 



Specific gravity. 



White oil 0.87 to 0.91 



Mother liquid of camphor 0.91 to 0.99 



Red oil 0.99 to 1.035 



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. 



