154 RESEAKCHES 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 S0 3 , 0.8697 



At 0°, after " " " 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 Sulphuric Acid. — 01589 gramme of cymole gave, by 

 combustion in a stream of oxygen gas, 0.5200 of carbonic acid, and 0.1532 of water. 



Carbon, Q 



Hydrogen, H 





Calculated. 



120 

 14 



89.55 

 10.45 



Found. 



89.25 

 10.71 



134 100.00 99.96 



