84 A. R. PENFOLD. 
available, particularly in certain of the Northern River 
Districts of New South Wales. 
(3) The same remarks apply here as under (2). For an 
oil yielding citronellal to the extent of 82 %, free from other 
aldehydes, it is a noteworthy source of that constituent, 
especially on account of the ease of collection of the plant 
material. Provided sufficient material is available, it should 
be a serious competitor of the oil of Hucalyptus citriodora. 
In fact the two oils are identical in odour, and cannot be 
distinguished except by chemical examination. 
Experimental. 
The leaves and terminal branchlets of this species, cut 
in all instances as for commercial distillation, yielded the 
following essential oils, which are best shown for purposes 
of comparison in tabular form, on page 85, viz:— 
The oil containing 827% citronellal obtained from material 
collected at Woodburn, N.S.W. was more closely examined | 
with the following result; on distillation at 10 mm. the crude. 
oil yielded the following fractions:— 




Boiling point °C.) Percentage |Specific gravity; Optical Refractive 
at 10 mm. by volume. 48°C, rotation, ° | index 173°C. 
59-— 84 | 13 0°8677 + 20°3 1°4591 
84— 87 20 OS 77 +10°7 1:4566 
8h 305 36 0:8744 + 88 1°4567 
90— 95 15 0°8802 + 89 1:4598 
95-110 9 0:9069 | +11-25| 1:4748 



Determination of the Terpene.—The fraction of boiling 
point 59—84° ©. at 10 mm. was treated with sodium bisul- 
phite solution to remove the aldehyde. The unabsorbed 
oil amounting to about 50% of the volume boiled at 156— 
160° C., had optical rotation +36°8", and refractive index 
at 17° 0. 1°4667. On mixing with an equal volume of levo- 
alpha-pinene of [a]p20°c. —50°L8° it readily gave a copious 
yield of nitrosochloride, which after purification, melted 
and decomposed at 109°C. The terpene, therefore, appears 
to be mainly d-c-pinene. 
Athi 
