AUSTRALIAN MELALEUCAS AND THEIR ESSENTIAL OILS. 67 
We have to acknowledge our indebtedness to Mr. S. J. 
Johnston, B.sc., for kindly cutting the section upon which 
the above histologic remarks are based. 
Essential Oil—The yield of oil obtained from the leaves 
with terminal branchlets of this tree was 1°214’, 260 pounds 
of material giving 503 ounces of oil.’ 
The material was collected at Gosford, a few miles north 
of Sydney, and in the month of September. The crude oil 
was pale yellow it being of a light lemon tint, and .had a 
turpentine-like odour which was much more strongly 
marked than with the oil of M. thymifolia. Therectified 
oil was colourless. The cineol content was low; phellan- 
drene could not be detected, nor was evidence obtained 
of the presence of pinene. The higher boiling portion 
contained a sesquiterpene which in its colour reaction with 
bromine (a few drops dissolved in acetic acid and the fumes 
of bromine passed into the liquid, a violet colour at once 
forms which falls through the liquid, the whole becoming 
deep violet changing to indigo blue after some time), 
correspond to the sesquiterpene of LHucalyptus oils. 
Volatile aldehydes were present in the first few drops 
distilling but the amount was very small. The optical 
activity was slight and to the right, and the refractive 
index higher than with the oil of M. thymifolia; this was 
due to the larger amount of high boiling constituents 
present. The oil of this species is largely a terpene one, 
but an alcohol was present which evidently corresponded 
with that occurring in the oil of M. thymifolia. 
The crude oil had a specific gravity 0°9129 at 15°C., a 
refractive index 1°4741 at 22° C., and a rotation in 100 mm. 
tube dp + 2°5°. On rectification only 1 ce. distilled below 
172° C., (cor.) but between 172—175° C. 17 ce. distilled. 
* In the Technologist, Vol. III and other places, the yield is given as 
about 1°5 per cext. 
