Part IV.] Simonsen : Constitiimis of Indian Essential Oils. 19 
It will be observed that the oil from Sind, whilst having a lower 
rotation than the Hazara oil, had both a higher density and refractive 
index, whilst the percentage of ketone present was very much lower 
and corresponded closely wdth that observed by Roberts in the oil 
from C. Sennaarensis . 
fn the Hazara oil the only constituent present in any quantity in 
addition to d-piperitone was a terpene, up to the present not identified,* 
which was obtained in a yield of about 20 per cent. The oil from Sind 
was apparently much more complex in its composition. In addition 
to piperitone (44 per cent), it contained a hydrocarbon identical prob- 
ably with that present in the Hazara oil (24 per cent), an imidentified 
alcohol with a rose like odour (2 per cent), a sesquiterpene alcohol 
(28 per cent), a trace of a phenol (0-2 per cent), whilst in a free or 
combined state it contained palmitic acid and a mixture of acids con- 
sisting apparently of decoic and octoic acids. 
These constituents resemble in a very remarkable manner those 
present in the oil from C. Sennaarensis, since Roberts (loc. cit. p. 
1470.) in summarising his results has stated that the oil contained (i) 
ketones (chiefly or entirely piperitone) 45 per cent, (ii) terpenes 13 per 
cent, (iii) imidentified alcohol 3 per cent, (iv) sesquiterpene alcohol 
25 per cent, (v) phenol 0-2 per cent, (vi) acids free and combined 
acetic, palmitic, octoic, decoic, 2 per cent. 
From a consideration of these results, in the authors’ opinion there 
can be little doubt that the oils from A. Jwarancusa grown in Sind 
and the oil from C. Sennaarensis grown in the Soudan are 
identical. 
In a footnote to the previous communication on this subject Mr. R. 
S. Hole has discussed the taxonomy of the various forms of A. Jwaran- 
cusa. So far as the botanical eiddence at present available goes there 
w'ould not appear to be any adequate botanical reason for differentiating 
the Hazara and Sind grasses. The chemical evidence, on the other 
hand, would appear to be strongly in favour of a differentiation, 
although the factor of climatic conditions should not be lost sight of, 
since many cases are known of the marked influence of climatic and soil 
conditions on the chemical constituents of plants. 
Attention may be directed to the somewhat wide distribution in 
nature of piperitone. It has now been identified in 
(t) Eucalyptus dives. (Read and Smith. Journ. Chem. Soc. 1921 
119. 779). 
(n) Q. Sennaarensis. Chiov. (Roberts, loc. cit.). 
* Note, added 9-8-22. This terpene has since been identified as d-A* carene. 
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