C. M. Warren on the Volatile Hydrocarbons. 
231 
As there shown, the boiling-point difference in the benzole series 
is also 80°, and the number of its members is reduced to four, 
in place of five, as alleged by Church. 
'y This difference of 30°, thus shown to be so common with the 
: hydrocarbons, is so much larger than the difference of 19° which 
. Kopp had found so frequent in other classes of substances, that 
e the discrepancy cannot be regarded otherwise than as conclusive 
a evidence, if such were wanting, that all liquid bodies do not obey 
j the same law in this regard, but that there are unquestionably 
those series in: which the boiling-point difference for the element- 
ary difference of C,H, may be greater than 19°, of which Kopp 
2 has already furnished some examples. : 
s That the difference may also be less than 19° in some series 
ag confirmation from the facts presented in the following 
6. Of the Nitro-compounds derived from the Hydrocarbons of the 
Benzole Serves. 
| Name of substance. Formula. Boiling-point. gre wana | een 
°o Rite SANG ° 
Nitro-benzole, (C,,H, NO,| 2121 13°8 
: atts 4 C,H 
Nitro-toluole, ae , NO, 25°95 on: 13°4 
Nitro-xylole, |C14H7 NO,| 2393§ | Cale 
Nitro-isocumole, |C,,H, ,NO, C,H, 
7. Of the Alkaloids derived from the Hydrocarbons of the Benzole 
Series. 
Name of substance. Formula. Boiling-point. a nosatonlsg a: prance 
| Anil N | 1846) _" 
Aniline. C8 “Oo? C.H 1771 
Toluidine, C..H, N | 201-75 ay 
Xylidine, Ci<H,,N | 2160* | CoH, 
Iso-cumidine, | C,,H,,N ote 
Tn regard to the results p 
resented in the last two tables, it 
of the difference shown in the table 
rage of 13°-6, the discrepan: 
cy 
to 
,H,. As this series does 
re I have taken care 
ifference as 
the 
* Not corrected. 
3 
corrected as 
circum- 
usual 
