THE ESSENTIAL OILS OF TWO LEPTOSPERMUMS. 165 
Determination of Sesquiterpenes and Sesquiterpene 
Aleohol.—These were worked up from the fractions of oil 
boiling above 120° C.at10 mm. That from the first lot 
boiling at 118—135° C. on repeated distillation over sodium 
at 10 mm. finally gave the following fractions in the pro- 
portion of one of the former to 2°5 of the latter. 
Boiling pointat10 mm. = 121 — 128° C. 129 — 132° O. 
Specific gravity at 72° C. 0°9195 0°9202 
Optical rotation inactive + 2°8° 
Refractive index 20° C. 1 4996 1°5040 
The second lot of oil gave only one sesquiterpene fraction 
boiling at 129—132° C. at 10 mm., had:— 
Specific gravity at +3°O.  0°923 
Opticai rotation —1°75° 
Refractive index at 20° C. 1°5041 
The higher boiling portion (140 —- 157° C. at 10 mm.) of 
Specific gravity at 32°C.  0°9659 
Optical rotation + 17°92° 
Refractive index at 20° C. 1°5090 
consisted largely of a sesquiterpene alcohol. Although 
not identified, it closely resembled the liquid form of 
eudesmol. 
The sesquiterpene fractions beyond giving the usual 
colour reactions with bromine vapour and acetic anhydride 
did not form any solid derivative. As insufficient oil was 
available to ensure undoubted purity, the writer thinks it 
advisable to consider the principal sesquiterpene as identical 
witheudesmene. Phenols—The amount of phenols present 
was very small, not exceeding 0°257. 
Acknowledgment is due to Mr. EK. H. F. Swain, Director 
of Forests, Brisbane, and Mr. Epps of Fraser Island, for 
their kindly assistance and interest in furnishing the 
supplies of leaves for the investigation. 
