Part IV.] Simonsen ; Constituents of Indian Essential Ods. 23 
PART V. 
The Essential Oil from the seeds of Zanthoxylum 
alatum, Roxh. 
Zanthoxylum alatum, Roxb. occurs in the Outer Himalaya from 
the' Indus eastwards ascending to 7000 feet ; in the Khasi and Naga 
Hills ; in the hills of Vizagapatam and Ganjam and in Burma. 
The oil from the seeds of Z. alatum would not appear to have been 
investigated previously. An oil examined by Semmler (Bericbte. 1911 . 
44. 2885.) and considered by kim to have been derived from these seeds, 
would appear from the evidence afforded in Part VII of this series (see 
page 31) to have been derived from the seeds of Z. Budrunga. 
The seeds from which the oil was distilled were kindly presented 
to the authors by Colonel C. R. Johnson of Abbottabad and the seeds 
were identified by Mr. R. S. Hole by a botanical examination of the 
plants from which they had been gathered. The authors wish to express 
their thanks to Colonel Johnson for his a'ssistance. 
The oil was found to consist almost entirely, over 85 per cent, of 
the hydrocarbon Z-a-phellandrene which was identified by conversion 
into the nitrosite. A small quantity of linalol was also present and in 
addition an unidentified sesquiterpene. The oil would not appear to 
be of any economic value. 
Experimental. 
The oil used for the experiments described below was obtained by 
the distillation in steam at a pressure of 25 lbs. of the freshly 
ground seeds of Z. alatum from the Hazara district. The oil which 
was pale yellow in colour, was obtained in a yield of 1-5 per cent and 
had the following constants : — 0’8482, 1’4715, saponification 
value 12‘98, saponification value after acetylation 31’7, acid value 
1-23. 
A quantity of the oil was distilled under diminished pressure 
(100mm.) when the following fractions were obtained : — 
No. 
B. P. 
Yield per cent. 
I 
108-120'’ 
85-3 
II 
120-140° 
6-6 
III 
140-180° 
7-3 
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