102 J. Schiel on Distillation of Common Rosin. 
A portion of the refined oil, treated in the same way, gave the 
formula €,;,H2.02, viz: 
Carbon, - - - - 86°44 86°25 
Hydrogen, - * Bras Sartigerncetyes tint OBL 9.95 
Oxyge. eee se 294 277 
16000 100-00 
Further investigation will show whether this difference is pure- 
ly accidental, and there is good reason to believe it to be so; or 
whether there is really a difference in the composition of the 
two products 
have to remark that it must be left undecided whether there 
may not be an admixture of some propylene with the above 5'89 
e 
homologous gases, ethylene, propylene and butylene, would fur- 
nish the equations: C+ yt 2=V 
22+ 3y+4z2=B 
22+2'5y+32=C 
V being the volume analyzed, B the volume of carbonic acid 
formed by the combustion, and © the contraction. From the 
first of these equations we have e=V—z— , and this value of 
« introduced into the two other equations, makes them 
¥+-22=B—2V 
7 y 
The second of these is evidently the half of the first and O=3B. 
For the determination of y and z we therefore have only one equa- 
By sending a current of common coal-gas slowly for an entire 
week through a number of flasks containing sulphuric acid, then 
diluting with water and distilling; I found on the surface of the 
is due the offensive odor of coal-gas. I hope h 
ue the -gas, et to obtain enou 
of this oily substanée for an ieatyite oe : 
Heidelberg, May 1, 1860, 
t, 
Bertie. 5 ee te 
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