RESEARCHES ON THE VOLATILE HYDROCARBONS. 
155 
After Treatment with Sulphuric Acid, and Distillation in Vacuo. — 0.1623 gramme of 
cymole, by combustion in a stream of oxygen gas, gave 0.5324 of carbonic acid, and 
0.1561 of water. 
Calculated. 
A 
Found. 
Carbon, Cx» “120 89.55 89.46 
Hydrogen, Hy 14 10.45 10.68 
134. —- 100.00 100.14 
The removal of impurity by treatment with sulphuric acid had therefore hardly a 
sensible effect on the results of analysis. 
Determination of Vapor Density before Treatment with Sulphuric Acid. — 
Temperature of balance, 11° 
Temperature of oil bath, 259° 
Height of barometer, 740.6™™ at 5° 
‘Increment of balloon, 0.4446 
Capacity of balloon, 239 ¢. ¢. 
Density of vapor found, . . 4,742 
Theory Cy» Hy = 4 volumes, 4.6351 
After Treatment with Sulphurie Acid. — 
Temperature of balance, 25°.5 
Temperature of oil bath, 255° 
Height of barometer, 760™- at 26° 
Increment of balloon, 0.4647 
Capacity of balloon, 282 ¢. ¢. 
Density of vapor found, . 4.7536 
Ditto before treatment with HO SO,, . 4.742 
Difference, 0116 
The results of the two determinations are therefore almost identical. 
A comparison of the above results with those obtained in the study of isocumole, 
the body from coal-tar naphtha boiling at 170°, will show that the two bodies are far 
from being the same substance, as Mansfield assumed, and that they have a constitu- 
tional difference of C, H,, and therefore doubtless belong to different series. 
Notre. —I had hoped to be able to present on this occasion the results of the study of some of the more 
important reactions of the hydrocarbons treated of in the preceding pages, — at least, of those in regard to 
which I have differed from my predecessors ; but as this work is yet incomplete, and as I am at present occu- 
pied with the study of other substances of more immediate interest, I will defer this branch of the subject for 
future consideration, in Part III. I may here remark, however, that the behavior of these bodies with re- 
agents is such as to strengthen the conclusions already expressed in regard to them. 
