J. W. Gibbs — Vapor- Densities. 373 
upon new experiments and in part upon a revision of the ob- 
servations recorded in the Comptes Rendus, the calculations 
being carried out to another figure of decimals. They are 
therefore entitled to a greater weight than the numbers of the 
preceding column. 
e agreement of the formula with the numbers given in the 
Legons de chimie is very good, the greatest divergences being 
080 at 190° and -062 at 180°. But at 190° the table in the 
1 
Horstmann and those of Cahours may be due in part to the 
different methods of observation, especially to the entirely dif- 
Saturated vapor at this temperature being about 12:7™".* In 
the remaining fifteen observations of this series, notwithstand- 
ing the very low pressures employed (from 2°44 to 11°32), the 
Steatest difference between the observations and the formula is 
‘04, and the average difference ‘02. 
€ two observations by Troost+ were made by the method 
of Dumas, but at pressures very low for this method. The 
Tesults obtained differ considerably from the formula, but not 
S© much as in the case of his experiments at low pressure with 
Peroxide of nitrogen. 
* This number is i iven by Bineau by the same kind of in- 
terpolation which was used for formic ach : 
+ Comptes Rendus, vol. Lexxvi (1878), p. 1395. 
