456 R. H. CAMBAGE. 
will sometimes grow in Mallee form, but in such cases the 
bark remains fairly thick and the timber soft. In bark, 
timber, oil and habit H. pumila much resembles HE. Behri- 
ana F.v.M., but differs in the flowers, fruits and leaves. 
Leaves of this Kucalyptus were procured and distilled in 
August 1907 at the Technological Museum. Messrs. Baker 
and Smith report on the oil as follows :— 
“The yield of oil is large, 617 tb. of leaves with terminal 
branchlets giving 9 tb. 10 oz. of oil—equal to 1°56 per cent. 
‘‘The oil is very rich in eucalyptol, and both in yield and euca- 
lyptol content this species is one of the best from which to distil 
Eucalyptus oil for pharmaceutical purposes, and in this respect 
may be associated with Z. Smithi, £. polybractea aud E£. Morrisiz. 
The oil contains some pinene, but the dextrorotatory form only 
slightly predominates, and consequently the large fraction of 
rectified oil does not vary but slightly in optical properties from 
that of the crude oil. This is contrary to the general experience 
with oils of the eucalyptol class, as in those the dextrorotatory 
pinene generally predominates. There are only a few species 
which give an oil, the rectified portion of which has a less dextro- 
rotatory than the crude oil; £. dealbata is one of the species 
having this peculiarity as well as #. Behriana, £. maculosa, and 
a few others. No phellandrene could be detected. A small 
amount of the lower boiling aldehydes was present; the odour 
indicated that butaldehyde and valeraldehyde were present, thus 
following the general rule. The crude oil in appearance and other 
characteristics resembles those of this group generally, and the 
rectified oil is slightly tinted yellow. 
“The higher boiling portion contains a very small portion of an 
aldehyde; this is perhaps aromadendral, but it was not separated. 
‘The sesquiterpene only occurs in small amount. The crude oil had 
specific gravity 0°9237 at 15°C. Rotation ay 2°3°; refractive 
index 1°4683 at 20° C., was soluble in 1:1 volumes of 70% alcohol 
by weight, and contained 74 per cent. eucalyptol by the phos- 
phoric acid method. On redistillation 89 per cent. came over 
