344 
from oxidation of the terpenes. If one is not sure that the brand of oil he is using contains much ozone, 
this may be made up for by prescribing a little peroxide of hydrogen along with the oil. The oil which he 
employed most was that of E. Smilhii, which consists mainly of pinene, and this was ozonised by exposing 
it to the action of light and air for a month before use. 
It will be observed that Dr. Hall takes up a different standpoint from Schimmel 
& Co. (following certain Pharmacopoeias), who insist on the fundamental of Cineol 
(Eucalyptol) for therapeutic purposes. 
1905. Bennett, C. T. (Ghem. and Drugg., Ixvi, 33 (1905) ) draws attention 
to cases of adulteration of Eucalyptus oil with Castor oil. 
Smith, H.G. " The Refractive Indices, with other data, of the oils of 118 species 
of Eucalyptus." Proc. Roy. Soc. N.S.W., xxxix, 39. The physical constants of 
Eucalyptus Oils in this direction are here recorded, and some interesting results obtained. 
The material worked upon was of undoubted origin and had been distilled at the 
Museum. 
Smith, H. G., and Baker, R. T. " Some West Australian Eucalypts and their 
Essential Oils." Pharm. Journ. (4), xxi, 356, 382. The chemistry of the oils of eight 
species is here recorded, also a research on the Aldehyde Aromadendral from the oil 
of E. salttbris. 
1906. " Eucalyptus Staigeriana, the 'Lemon-scented Ironbark/ and its 
Essential Oil." Pharm. Journ. (4), xxii, 571, March, 1906. An investigation to 
determine the constitution of the oil of this Queensland species. The occurrence of 
laevo-limonene in large quantities is here recorded. The aldehyde was Citral, and 
Geraniol and Geranyl-acetate were also present. 
Schimmel & Co. Important papers on Eucalyptol (Cineol) determination will 
be found in Schimmel's Semi-annual Reports, October,, 1907, p. 45, and April, 1908 
p. 50. 
1909. Eucalyptus leaves extract (left after the distillation of the oil of 
E. globulus) has been used at Port Esperance, Tasmania, to prevent incrustation in 
boilers. (Schimmel's Semi-annual Report. October, 1909, p. 67.) 
1910. Brownscombe, W. J. " Essential Oils of the B.P. The Eucalyptus Oil 
Monograph." Chem. and Drugg., Ixxvi, 669, 30th April, 1910. 
The principal constituents of Eucalyptus oils are Eucalyptol (generally associated with Pinene) 
and Phellandrene (generally associated with Piperitone). Eucalyptus oils may be roughly divided into 
three characteristic classes, according as they consist principally of one or other or both of these constituents, 
thus : 
Class 1. Oils consisting principally of Eucalyptol and containing no Phellandrene. 
Clots 2. Oils consisting principally of Phellandrene and containing no Eucalyptol. 
Class 3. Oils consisting of both Eucalyptol and Phellandrene. 
He points out that the oil introduced by Bosisto and the first to bring Eucalyptus oil under public 
tice, belonged to Class 3, and that some years afterwards distillates of E. gkbulus (Class 1) from Algeria 
came on the English market, and both 1 and 3 were used in medical practice and were recognised as official. 
