260 AUSTRALIAN NATIVE PLANTS. 
by contact, first with solid potassium hydrate, then with calcium 
chloride, and subsequent distillation. 
Eucalyptol boils at 175°, has a specific gravity of .go5 at 8°, 
and turns the plane of polarization to the right. Its molecular 
rotatory power is 10.42° for a length of 100 mm. It is slightly 
soluble in water, and dissolves completely in alcohol; the dilute 
solution has an odour of roses. Vapour density observed =5.92, 
calculated =6.22. Ordinary nitric acid slowly attacks Eucalyptol, 
forming, among other products, an acid probably analogous to 
camphoric acid. Strong sulphuric acid blackens Eucalyptol, and 
water separates from the product a tarry body which yields by 
distillation a volatile hydrocarbon. 
Eucalyptol heated with phosphoric anhydride gives up water, 
and yields Zucalyptene (g.v.). At the same time there is formed 
another liquid, Lucalyptolene, which has the same composition, but 
boils above 300°. 
Eucalyptol absorbs a large quantity of dry hydrogen chloride, 
the liquid first solidifying to a crystalline mass, which, however, 
afterwards liquefies, with separation of water, and formation of a 
body apparently identical with Eucalyptene. (Cléez, in Waszs’ 
Dict. ii., Suppt., p. 492.) 
Later experiments by Faust have, however, modified those of 
Cléez, above described, inasmuch as the body called ELucalypiol 
has been found to be a mixture of about 70 per cent. of Lucalypfene, 
and 30 per cent. cymene. After rectification over sodium, it boils 
between 171° and 174°. It dissolves in all proportions in absolute 
alcohol, ether, and chloroform, and in about 15 parts of 90 percent. 
alcohol; has the odour of a fine terpene; detonates with iodine; 
absorbs oxygen with avidity; turns brown with strong sulphuric 
acid, and is converted by oxidation with dilute nitric acid into 
paratoluic and terephthalic acids. 
The Eucalyptene and cymene contained in Eucalyptol cannot 
be separated by fractional distillation. To obtain the cymene, the 
mixture was shaken with sulphuric acid diluted with one-fourth 
part of water, and then heated, whereby the Eucalyptene was 
polymerised ; then, after three days, the liquid was mixed with 
water and distilled, whereby a distillate was obtained, consisting of 
