ESSENTIAL OIL AND SOLID CAMPHOR IN E. PIPERITA, 195 
On THE ESSENTIAL OIL anp THE PRESENCE oF A SOLID 
CAMPHOR or STEAROPTENE 1 tHe “SYDNEY 
PEPPERMINT” ZUCALYPTUS PIPERITA, 8m. 
By R. T. Baker, rF.u.s., Assistant Curator, and Henry G. 
Siru, F.c.s., Mineralogist, Technological Museum, Sydney. 
[Read before the Royal Society of N. 8. Wales, August 4, 1897.] 
(a) Introductory. 
(6) Botany of E. piperita. 
(c) Description and — of the Oil. 
(d) A new Solid Camph 
(e) Probable Pierasousse Papen of the Oil. 
(a) INrRoDUCTORY. 
An exhaustive research is now being conducted at this Museum 
on Eucalyptus oils of .undoubted botanical origin. Previous 
workers in this field of science have expressed regret at the 
difficulty experienced in obtaining leaves true to name, as there 
are few persons who can distinguish the species amongst the living 
trees of this most difficult genus. In our case each oil is distilled 
from leaves and terminal branchlets of trees selected by ourselves. 
in the bush, and flowers, fruits, wood and bark are preserved, so 
that the botanical derivation is beyond dispute. The oils are also 
distilled at the Museum under our own supervision, and every 
datum connected therewith is carefully noted and recorded. 
Dr. R. N. Morris, the Superintendent of Technical Education, 
is giving us every assistance in our researches on these oils, and 
we are also indebted to Mr. Owen Blacket, Lecturer in Engineer- 
ing, and Mr. F. Camroux, Teacher in Applied Mechanics, for 
valuable help in the management and erection of the still and its 
appurtenances. 
We have commenced our researches with what is a classical 
oil, viz., that of E. piperita, Sm., for it was from this species that 
the first! essential oil was extracted from — tree belonging to 
