C. M. Warren on the Volatile Hydrocarbons. 101 
These results show clearly that this body has the formula 
C,,H,,, and that it is doubtless the third member of the ben- 
zole series.” Although xylole, first discovered by Cahours in 
the oil separated from wood-spirit, has had a much lower boil- 
ing-point assigned to it, I have retained that name for this body, 
since the results which I have obtained in the study of the light 
oil from wood-tar indicate that when the corresponding body 
from this source is in a state of equal purity, its boiling-point 
will agree with the above determination. I may here mention 
that in my researches on the light oil from wood-tar I have ob- 
tained a body at about 140°, but nothing between that and 110° 
(these temperatures are not corrected), although special pains 
were taken to work up the intermediate fractions. So that I am 
in a position to justify the assertion that no other body was 
a in appreciable quantity between the temperatures men- 
ione 
__ 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. IsocumoLE (Cymole of Mansfield).—Specific gravity, 0°8643 
at 0°, and 0:8538 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 occupie twenty-five minutes. 
Before distillation was commenced, the temperature of the boil- 
ing liquid was found to be 166°5, and at the close of distilla- 
tion 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 gram of the substance gave, by combustion 
In stream of oxygen, 0.6366 of carbonic acid, and 0°1896 of 
water, 
Calculated. Found. 
o~e-— 
Carbon, Cis 108 90°00 89°31 
Hydrogen, H,, 12 10°00 10°84 
120 10000 100-15 
“ As this memoir is ing through the press, the receipt of my journals for 
ber dischtien 40 late wietions of Miiller, and 
Naquet concerning this hydrocarbon. Miiller concludes that it is xylole, a result 
ich agrees with my own. nnalen der Chemie und Ph: ie, 1864, cxxxi, 
wh armaci 
321.) Béchamp, on the contrary, erroneously regards it as being a mew hydrocar- 
is t Bigate (Bulletin de la Société Chimique, Paris, 
a new hydrocarbon, and gives it the formula 
