ON THE AROMA OP THE JONQUIL. 
53 
M. Rose regards this resin as isomeric with the crystalline 
resin of elemi, and that the difference in composition arises 
from its retaining a small portion of foreign matter, from which 
it was found impossible to free it. 
Journ. de Pharm. 
ART. IX. — ON THE AROMA OF THE JONQUIL. 
By M. Robiquet. 
The odour of most aromatic plants appears to reside in an 
essential oil, which can be obtained by distillation; but there 
are several, as the jonquil, the jasmine, the heliotrope and the 
tuberose, which although endowed with the richest perfume, 
do not furnish it in a separate state, and hence to extract it, 
recourse is had to different methods, the most common of 
which, is that of placing these flowers in contact with cotton, 
saturated with some bland and inodorous vegetable oil. This 
in time becomes charged with the odour of the flower, and is 
then employed for various purposes by the perfumer. This 
has led to a belief that these flowers, either contained no 
essential oil, or that it was so volatile as to prevent its being 
obtained in a condensed form. 
As distillation was useless, I was obliged to have recourse 
to other means and particularly to the employment of various 
menstrua. Ether having appeared the most likely to afford 
good results, from the readiness with which it dissolved the 
oils, as well as the facility with which they separated from it 
when the solution was exposed to a very low temperature; I 
hence had recourse to my adapters,* and with additional evi- 
* For description of this apparatus, see Journal Phil. Coll. Pharm. iv. 
p. 70. 
