106 C. M. Warren on the Volatile Hydrocarbons. 
The specific gravity of my —* of cumole was found 
to be 0.8792 at 0°, and 0°8675 a 
Determination of Boiling-point. mee quantity of material being 
quite small, this determination was made in a large test tube, 
with the usual precautions. It had not a perfectly Sone 
boiling-point, the distillation ranging from 148°-4 to 151°°6. 
plying the proper corrections to the mean of ties, observations, 
gives, for the boiling-point of cumole, 151°-1, which is do ubt- 
less a little too high from the impracticability of aaltae a com: 
plete separation with the small quantity of material employed. 
If the boiling-point ae Sided between cumole and cymole, for 
the difference of GC. n their elementary formule, is 30°, as 
there is every reason to ichiacs then the boiling-point ‘of cumole 
should be 150°, as I have found the mine: -point of cymole to 
e but a fraction under 1 
Analysis.—0'1700 gram of cumole gave, by combustion with 
oxyd of copper, 0°563 of carbonic acid, and 0°1557 of water. 
Calculated. Found. 
Carbon, 4, 108 90:00 90°35 
Hydrogen, H,, 12 10°00 10°18 
120 100-00 100°53 
Determination of Vapor Density.— 
Temperature of balance, 17° 
Temperature of oil bath 
Height of barometer, 460°T?™ at 15° 
Increment of balloon, 
Capacity of balloon, 232 cc. 
Density of vapor found, 42003 
Theory, C,,H,,=4 volumes, 4151 
This determination, as well as the results of analysis, confirms, 
therefore, the formula which Gerhardt and Cahours had assigned 
to this body. I had anticipated a different result from this, inas- 
much as the hydrocarbon from coal-tar n naphtha, which I have 
called iso-cumole, boiling at 170°, or nearly 20° higher — cu- 
mole from cuminic acid,— ad been ound, as ave wn 
above, to have the formula CisHi2. Iam forced to the concl “sion 
therefore, that these two bodies are isomeric, and belong to differ- 
ies. reliminary examination of their behavior with 
reagents indicates that their chemical properties are also differ- 
ent. These will be treated of on a future occasion, in Part 
_8. Cymote.—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 re 
points, ts,—Gerhardt and C Cahours found it necessary to 
