148 RESEARCHES ON THE VOLATILE HYDROCARBONS, 
the assertion that no other body was present in appreciable quantity between the 
temperatures mentioned. 
That this body from coal-tar naphtha, boiling at 140°, is not identical with cumole 
from cuminic acid, will be made apparent on comparison of the results above stated, 
with those which will be given when treating of cumole. 
4, Isocumotge. ( Cymole of Mansfield.) 
Specific gravity, 0.8643 at 0°, and 0.853 at 15°. 
Determination of Boiling-point.— This was conducted with the usual precautions, and 
under conditions similar to those detailed above. The distillation, as in the foregoing 
determinations, was continued nearly to dryness, and occupied twenty-five minutes. 
Before distillation was commenced, the temperature of the boiling liquid was found to 
be 166°.5, and at the close of distillation 167°... Applying the customary corrections to 
the average of these observations, viz. 166°.75, we obtain for the corrected boiling- 
point 169°.8. 
Analysis. — 0.1944 gramme of the substance gave, by combustion in a stream of 
oxygen, 0.6366 of carbonic acid, and 0.1896 of water. 
Calculated. Found. 
| ie 
Carbon, Cis 108 90.00 89.31 
Hydrogen, Hy 12 10.00 10.84 
120 100.00 100.15 
Determination of Vapor Density. — 
Temperature of balance, . “ ‘ a a F 18°.5 
Temperature of oil bath, i 3 . F 5 241°.0 
Height of barometer, ‘ . ‘ - 769.5™™- at 9° 
Increment of balloon, " Z F ‘ 3 : 0.4206 
Capacity of balloon, . . < ‘ é zi 239 c. ¢. 
Density of vapor found, . . - 43019 
Theory Cy Hie, . 5 - 4151 
Hence it appears that the calculated density on the formula C,, H,, is 0.151 ess than 
that found by experiment. The calculated density on the formula Cy H,,, which has 
previously been assigned to this body,— although, as above stated, without an 
analysis or determination of vapor density, —is 4.645; which is 0.302 greater than 
that found by experiment. It will be observed that the difference between the den- 
