96 C. M. Warren on the Volatile Hydrocarbons. 
2. That the benzole series within that range of temperature 
is limited to four members, and therefore does not contain five, 
as has been generally supposed. 
8. That these four members have the boiling-points 80°, 110°, 
140°, and 170 respectively ; and consequently that the boiling- 
4. That the body obtained from coal-tar naphtha, boiling at 
140°, is not identical with cumole from cuminic acid, as assumed 
by Mansfield, nor even isomeric with it; but that it has the 
formula which has been assigned to xylole, containing C,H, 
less than that of cumole. 
5. That the body obtained from coal-tar naphtha, boiling at 
170°, is quite a different body from eymole obtained from oil of 
cumin,—with which it has been considered identical, as assumed 
by Mansfield,—these bodies differing from each other by C,H,. 
6. That cumole from cuminic acid, and cymole from oil of 
cumin, do not even belong to the benzole series. 
7. That the Parabenzole of Church was in all probability only 
a mixture of benzole and toluole. .- 
Of the Quality of Naphtha employed in this Investigation —As 
I have taken occasion to question the existence in coal-tar naph- 
tha of two of the substances which it has been said to contain, 
—viz. cymole, C, ,H,,, nzole, C,,H,,—it is a mat- 
ter of some importance that I should clearly state the kind or 
quality of the naphtha employed. The tar from which this 
oy Se was obtained was a mixture of the tar furnished by the 
following companies, viz. the New York and the Manhattan 
Gas-Light Companies, of New York; Brooklyn Gas-Light Com- 
pany, of Brooklyn, N. Y.; Albany Gas-Light Company, of 
Albany, N. Y.; and the Gas-Light Companies of Newark and 
Jersey City, in New Jersey. It was mostly made from Cannel 
Newcastle caking coals, which were imported from Liver- 
7 r and mixed in the proportions of one-third to five-eighths 
nnel, to two-thirds to three-eighths Newcastle. In some of 
the works rh shies of the caking coal was from mines in Penn- 
sylvania. e tar from these different gas-works, as re 
of the gas-works referred to are large, the an- 
ie to up 
,000 barrels. It does not appear, therefore, that the ab- 
sence of the bodies in question from the naphtha which I have 
employed, can be attributed to any peculiarity of the tar. The 
