150 



RESEARCHES ON THE VOLATILE HYDROCARBONS. 



fractional condensation already referred 



g 



addition to cymole and the 



residue of cuminole, a body boiling at about 155°, which so closely resembles oil of 



turpentine in od 



to be hardly distinguishable from the latter substance 



subse 



The presence of this body may account for the very low boiling-point which Gerhardt 

 and Cahours assigned to cymole, viz. 165°. The boiling-point of cymole was 

 quently found by Gerhardt* to be 175°, but my own determination places it still 

 by about 5°. It is evident, therefore, from a comparison of their own determin 

 that the oil of cumin which they originally operated upon 



below cymole ; and hence the finding of such 



contained an oil boiling 

 that which I employed need 



doubt 



being genuine. This lighter body is p 



so 



small 



quantity as hardly to admit of its being detected, or at least identified, by the old 



process of fractionin 



and 



detection and isolation by the new process is but 



another illustration of the superior excellence of this method 



1. Of the Body resembling Oil of Turpentine. 



Specific gravity, 0.8772 at 0°, and 0.8657 at 15°. 



Determination of Boiling-point. — The quantity of material at command was too small 

 to admit of attaining so high a degree of purity for this body as was desirable. The 

 product obtained, however, distilled almost to dryness between 153°. 4 and 155°. 5. 

 Taking the average of these observations, and applying the usual corrections, we 

 obtain 155°.8 for the boiling-point of this body. 



Analysis. — 0.2575 gramme of the substance gave, by combustion with oxide of 

 copper, 0.8283 of carbonic acid, and 0.2766 of water. 



Calculated. 



Found. 



Carbon, 

 Hydrogen, 



C 



20 



H 



16 



120 

 16 



136 



88.24 

 11.76 



100.00 



87.73 

 11.94 



99.67 



Determination of Vapor Density. 



Temperature of balance, 

 Temperature of oil bath, 

 Height of barometer, 

 Increment of balloon, 



16 

 211 



758°.4 ram - at 14° 



. 0.4939 



Capacity of balloon, 221 c. c. 



* Annales de Chimie et de Physique, 1845, 3 e Serie, IV. p. Ill 



