108 C. M. Warren on the Volatile Hydrocarbons. 
The removal of impurity by treatment with opi poh _ had 
therefore hardly a sensible effect on the results of an 
Determination of Vapor Density before Treatment ih suki 
Acid.— 
Temperature of balauce, - 3 hy 
Temperature of oil bath, 259° 
Height of barometer, 740°6™™ at 5° 
Increment of balloon, 0°4446 
Capacity of balloon, 239 e.c. 
Density of vapor found, 4-742 
Theory, C,,H,,—=4 volumes, 46351 
After Treatment with Sulphuric Acid.— 
Temperature of balance, 25°°5 
Temperature of oil bath, 255° 
Height of —— 760™™ at 26° 
Increment of balloon, 0°4647 
Capacity of balloon, 232 cc 
Density of vapor 
r found, 4°7536 
Ditto before treatment with HOSO,, 4°742 
Difference, "0116 
The results of the two determinations are therefore almost 
identic 
A com rison of the above results with those obtained in the 
study of isocumole, the body from coal-tar naphtha boiling at 
M10", will show that the two bodies are far from being the same 
tance, as Mansfield assumed, and that they havea constitu- 
Fis difference of C ,H,, and therefore doubtless init to dif: 
ferent series. 
of these bodies with reagents is pat as to s trengthen the conclusions 
already expressed in regard to them 
[To be constodei) 
