154 RESEARCHES ON THE VOLATILE HYDROCARBONS. 
3. CYMOLE. 
Notwithstanding that this body is so much more volatile than the cuminole with 
which it is associated in the oil of cumin, — there being a difference of 40° between 
their boiling-points, — Gerhardt and Cahours found it necessary to resort to chemical 
means, viz. treatment with fused potash, in order to isolate it. Being desirous of test- 
ing the efficiency of my process in effecting the separation, the preparation employed 
in this investigation was obtained by fractional condensation, this process having been 
found as effective in this as in other cases. This will appear by a comparison of the 
results obtained in the study of this body before and after treatment with concentrated 
sulphuric acid, which is also effective to remove cuminole. 
Specific Gravity. — 
At 0°, before treatment with HO SO,, 0.8697 
At 0°, after ee me ee 0.8724 
At 14°, before “ & 0.8592 
Determination of Boiling-point before Treatment with Sulphuric Acid. — The preparation 
was found to distil to dryness between 175.8 and 177. The temperature remained 
absolutely constant at 176° during the lapse of ten minutes, and occupied fifteen 
minutes in rising from 176° to 176.5. Taking the mean of the former numbers, viz. 
176°.4, and applying the proper corrections for pressure, etc., we obtain 179°.5 for the 
boiling-point of cymole. 
After Treatment with Sulphuric Acid. — The preparation distilled to dryness between 
176° and 177’, the temperature remaining thirteen minutes constant at 176°.3, indicating 
that no essential change in the boiling-point had been produced by the acid treatment. 
It was nevertheless evident that some impurity was being removed by the acid, as 
the first portions of the latter became dark-colored and thickened on being agitated 
with the oil. Successive portions of acid were therefore employed, until it ceased to 
produce any marked effect. 
Analysis before Treatment with Sulphurie Acid. — 0.1589 gramme of cymole gave, by 
combustion in a stream of oxygen gas, 0.5200 of carbonic acid, and 0.1532 of water. 
e Calculated. Found. 
sem 
Carbon, Cop 120 89.55 89.25 
Hydrogen, Hy 14 10.45 10.71 
_~ 
—_—_. —————— 
134 100.00 99.96 
