48 
PRESIDENT’S ADDRESS — SECTION B. 
oil-yield is comparatively great (2 to 3 per cent). We know very little 
yet of the variation in the oils of Eucalyptus caused by different 
circumstances of habitat, size, and season of growth of the trees. My 
experiments with amygdalina tend to show that its specific gravity is 
low— say, from *862 to *885 in ordinary samples ; it contains but little 
cineol, and an overwhelming proportion of phellandrene. I observe, 
however, that Wilkinson* gives the specific gravity of oil of this 
species (taking only two decimals) at *85 to 'S9, and from '91 to ’96 
(P a blended oil). 
E. amygdalina is very largely sold in Australia under the generic 
term of “ Eucalyptus Oil,” but it is also a great deal used for blend- 
ing, so that I doubt whether much arrives in England in the 'pure 
state. In fact blending is a good deal more resorted to than is usually 
imagined. 
Schimmel and Co. state that the oil of Eucalyptus crebra and 
E . hemiphloia are “ very rich in cineol. ”f The former is the Narrow- 
leaved Ironbark and the latter is Grey Box. Both trees are very 
abundant, and should be tested for oil yield. The same firm also state 
that the oil of E. niicrocorys, E. v. M. (Tallow-wood), contains cineol, 
has a sp. gr. of '935, and boils between 1 00° and 200°.J Staiger states 
that the leaves yield about 2 per cent, of oil, and I certainly think 
that this is a species which should be carefully tried by the distiller. 
E. odorata , Behr. (sp. gr. *907), containing euminol in addition to 
cineol, should also be tried. Schimmel also states that E« populifolia , 
Hook, contains “a fair proportion of cineol.” I have recently 
examined the oil of E. pulverulent a (Argyle Apple), which has not 
been previously described. It is of a bright green colour, like 
Cajcput, has a specific gravity of '9145 at 23° C., gives excellent 
results for cineol, and shows only the slightest indications of phel- 
landrene. When re-distilled, aldehydes commence to come over at 
110° C., and between this and 171° C., when the temperature becomes 
stationary, 10 per cent, has distilled over. An additional 85 per cent, 
comes over between 171° and 195°. This distillate is a very good oil, 
only showing a slight tinge of green, is rich in cineol, and almost free 
from phellandrene. It has a sp. gr. of *912 at 25° C. This oil is very 
full of promise, and I intend to further examine it. 
Schimmel has examined the oil of E . rostral a, Schlecht. J (Murray 
Red Gum). Its sp. gr. at 1 5° C. is '924, and optical rotation + 12° 58'' . 
Besides Cineol it contains Valeraldehyde. This species is worthy of 
proper practical tests. The same firm, however, find no cineol in a 
Queensland sample of E. tereticornis oil. If this be confirmed it will 
be remarkable, considering the close botanical affinity of this and the 
preceding species. 
For practical purposes it is convenient to deal with the mallee 
oils separately. The vegetation of Kangaroo Island, South Australia, 
is mainly composed of a mallee, the Narrow-leaf Peppermint 
(E. cneorifolia), audit yields an oil of high specific gravity and Cineol 
percentage, and contains little or no aldehydes. The oil of E. dumosa 
is also valuable. That of E. oleosa has been examined by Schimmel, J 
*Proc. R.S. Viet., 2, vi., 197. fBericht, April, 1893, 38. 
X Bericht, Oct., 1893, p. 21. 
