260 R, T. BAKER AND H. G. SMITH. 
as New South Wales is concerned, we hope to bring under the 
notice of its commercial community, the means of removing this 
reproach, at present surrounding the Eucalyptus oils produced 
and exported from Australia. There can be no doubt from the 
above quotation, that the desideratum of future productions of 
the oil is that the botanical origin be authenticated. 
Each species investigated is vouched for, and botanical material 
(leaves, buds, fruits, bark and timber) of the trees, from which 
the leaves were collected under our supervision, are placed in the 
Museum herbarium, for future reference, and to determine any 
botanical queries that may occur. This plan will be adopted 
throughout the series, and with the botanical material each oil 
will be shown in juxtaposition, in the Museum essential oil court. 
In Victoria, Tasmania, South Australia, and Queensland, dis- 
tillations of £. globulus, Labill., 2. olecsa, F.v.M., FE. Risdoni, 
Hook. f., #. rostrata, Schl., Z. eneorifolia, DC., and £. maculata, 
Hook. var. citriodora have been carried on with more or less success. 
In regard to New South Wales very little has been done to 
develope the eucalyptus oil wealth. We hope to show that there 
is one widely distributed species at least in the coastal area of this 
colony, yielding on oil equal in quality to any yet known in 
Australia. Our reasons for dealing with Z. punctata, DC., 80 
early in the series is, that of the twelve or more species distilled, 
this one proves so far to be the best. 
To the suggested divisions of the genus Eucalyptus, depending 
upon structural differences, we feel disposed to add another based 
on the chemical constituents of the several trees. 
II.—Histotueicat Noress. 
As our chemical determinations on the oil of this particular 
species resemble those of 2. globulus, Labill., we have histologic- 
ally compared the leaves of this species with those of 2. punctata. 
Had we at first thought to examine the leaves microscopically 
before the distillation we should not have been surprised at the 
large yield of oil, for of the dozen species so investigated not one 
