VAPOR-DENSITIES. 



387 



TABLE III. FORMIC ACID. 



EXPERIMENTS OF BINEAU. 



Whether the large excess of observed density in these cases represents 

 a property of the vapor, or an incipient condensation on the walls 

 of the vessel which contains it, as has been supposed by eminent 

 physicists in similar cases, we need not here discuss. 



If we reject these cases of nearly saturated vapor, as well as the 

 three earlier determinations, there remain 25 experiments at pressures 

 somewhat less than one atmosphere in which the maximum difference 



