150 RESEARCHES ON THE VOLATILE HYDROCARBONS. 
fractional condensation already referred to, it gave, in addition to cymole and the 
residue of cuminole, a body boiling at about 155°, which so closely resembles oil of 
turpentine in odor, etc. as to be hardly distinguishable from the latter substance. 
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 subse- 
quently found by Gerhardt* to be 175°, but my own determination places it still lower 
by about 5°. It is evident, therefore, from a comparison of their own determinations, 
that the oil of cumin which they originally operated upon contained an oil boiling 
below cymole ; and hence the finding of such an oil in that which I employed need 
not raise a doubt as to its being genuine. This lighter body is present in so small 
quantity as hardly to admit of its being detected, or at least identified, by the old 
process of fractioning; and its detection and isolation by the new process is but 
another illustration of the superior excellence of this method. 
1. Or toe Bopy RESEMBLING O1L 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 185.5. 
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, Cu 120 88.24 87.73. 
Hydrogen, His 16 11.76 11.94 
136 100.00 99.67 
Determination of Vapor Density. — 
Temperature of balance, : F ‘ . ‘ ‘ 16° 
Temperature of oil bath, : ‘ , . ‘ 211° 
Height of barometer, . : A : - 758°.4™- at 14° 
Increment of balloon, ‘ ; ij . ‘ - 0.4939 
Capacity of balloon, a ‘i P : é ‘ 221 ee. 
* Annales de Chimie et de Physique, 1845, 8° Série, IV. p. 111. 
