232 C. M. Warren on the Volatile Hydrocarbons. 
5 
point of this body is doubtless very nearly correct, those of nitro- 
benzole and nitro-toluole are more to be re upo n 
omitting the fraction, the number 14° ma think, be safel 
have made this discrepancy larger than mine. It was on ac 
count of the fact that so small a discrepancy would naturally 
raise a doubt as to the reliability of the ‘i : 
the reason that Kopp” has considered this series of alkaloids as 
agreeing tolerably well with his general law, that special care 
w n my part to arrive at a correct result. 1 am conf. 
dent, therefore, that the boiling-point difference here will not be 
found to vary more than a fraction from 17°. Of the absolute 
accuracy of the boiling-points themselves I do not speak so com 
fidently, since these depend so much on the accuracy of the 
thermometer at these high temperatures; but the correction of 
any errors which may have arisen from this source would not 
be likely to alter the relation, and the difference between the 
boiling-points would still remain about the same. This remark 
applies with equal force as to the reliability of the other boiling 
points presented in this paper, especially of those of high tem 
—— pane 
= t remains now to consider the foregoing facts with referen 
__ to the other theories mentioned. ates 
[To be concluded.} 
* Annalen der Chemie und Pharmacie, 1855, xcvi, 24. 
ee oo ‘ 
Epes ere. 
Br Tepe ie des ae 
