( 274 ) 



If we put ^ ^^ — 5-T- = ƒ, then / = O, because the plaitpoint 

 OtV^ ov^ \oa;övy 



is a point of the spinodal line. In the same way: 



'^m +'1 = 



Ov \dxJpT d^ 

 because it concerns a plaitpoint. 



If we multiply the numerator and the denominator of the fraction 



occurring in (3) by I -r-j I , we get : 



dv _ fdp\ /d'8^ \dxdv 



dT \dTJ,:, \dvy:cT(^'^\(d'v 



\d^) Kd^'JpT 

 fd'v\ /5>^^ , . 



The value of -— - -^-v we derive irom : 

 \dxypT\Ovy 



dv\ \dx du 



and find then : 



d'lp 



~~ \bv^J Kdx^JpT ~ öü^ öic'dü ~ dx bv dx dy' ö'ip ^ö^ 0^ 



As for the critical point of a component both -^ and ^ is equal 

 to 0, the last equation becomes: 



/ö>Y /d'v\ _ 

 "KM J [d^'JpJ 



The limiting value of ^^ can be found from the equation which 



expresses that the critical point of the component is a plaitpoint, viz. : 



dv dxdv dx dv' 



1) In a derivation of the discussed formula in my communications of 1895 I put 



.- — 0. It would Lave been more accurate, if 1 had put this quantity infinitely 

 Ov 



small compared to ^. 



