( 471 ) 



We may namely diminish the quantity which is to be the same 

 for both phases, by an arbitrary constant or function of the tempe- 

 rature, and we put then 



2a 

 rTFb 



n + 



If 



and 



a rT f'^^i\ '■ 

 p^ — = -, then (— j = 



I r db ) 



rj = r )log{v — b)-]- I^p3^ 



and the quantity which is to be equal for the two phases, may be 

 given under this form : 



rT [Fb — ( Fdb} — — 

 log (v—b) — ■ 



In my communication to which I have referred before, I have 

 deduced this formula, starting from the idea that there exists a 

 thermic pressure, which expels the molecule and is counteracted by 

 the molecular attraction. 



We may write the quantity which must be the same in the two 

 phases in this way : 



_ ^_^ 



By comparing it with the formula of Prof. Boltzmann, we find 

 that he substitutes rlo(/{v — 2 0» etc. j + C for 



do 



If the formula under the symbol log. was perfectly accurate, 

 Prof. Boltzmann should be able to prove, that the entropy could 



