CRYSTALLINE CAMPHOR OF EUCALYPTUS OIL. 87 



upon their botanical diagnosis, as the chemical constituents of 

 each species appear to be identical under certain conditions, and 

 governed by laws that will eventually be better understood. A 

 large number of facts have accumulated, without exception sup- 

 porting this statement, and will later be published. It is hoped 

 that by working on material of undoubted authenticity the results 

 may be of permanent value from a commercial as well as a scientific 

 standpoint, and I wish to express my thanks to my colleague, 

 Mr. R. T. Baker, f.l.s., for the botanical diagnosis of the species. 



The presence of the camphor, and the natural formation of 

 Eucalyptol. 



The oil of Eucalyptus goniocalyx was found to be exceedingly 

 rich in eucalyptol, and the presence of eudesmol was very marked. 

 Dextropinene was also present, the oil somewhat resembling, in 

 colour and constituents, that of E. globulus and belongs to the 

 same group of trees giving like oils. Phellandrene could not be 

 detected, nor was any to be expected, because in the oils of this 

 class, already determined by me, no phellandrene could be found. 



The oil of Eucalyptus Smithii 1 was found to be richer in 

 eucalyptol than any oil yet obtained during this research. 

 Eudesmol was present in the oil obtained from the leaves of two 

 consignments, a month separating the dates of the collections, 

 (August and September 1898, from Monga N.S.W., yield of oil 

 1*345 per cent., mean of four distillations). Dextropinene was 

 present in this oil, and the specific rotation of the rectified oil 

 was [a] D + 7 "01°. The constituents which give the oil of E. 

 globulus its comparatively high specific gravity were largely absent 

 in this oil, the consequence being that rectified oil of this species, 

 representing 92 per cent, of the crude oil, and containing over 70 

 per cent, of eucalyptol, only just satisfies the specific gravity 

 requirements of the new British Pharmacopoeia, and has a less 

 specific gravity than many other oils containing considerably less 

 eucalyptol ; again illustrating the weakness of the specific gravity 



1 See paper by Mr. R. T. Baker, "On three new species of Eucalyptus." 

 — Proc. Linn. Soc. N. S. Wales, June 28, 1899. 



