( 740 ) 



first time in formula (4) Verslag K. A. v. W. Mei 1895, and at the 

 close of that communication I have written this factor in the form: 



v dx 2a dx) a? ) 



from which appears that in any case when «!«., >a 12 a , this factor 

 is negative. Here, too, I shall assume this factor to be always negative, 

 but I may give a fuller discussion later on. 



In consequence of these reductions the differential equation of the 

 spinodal curve may be written as follows : 



iPijj ftPv\ d'tfj fd*v\ dT / \ 



dV [d^) P T dv + ** U?J f r* + T [r ) = °' 



From this equation follows inter alia this rule concerning the 

 displacement of the spinodal curve with increase of T, that on the 



(d*v\ 

 side where I — I is positive, the value of v with constant value of 



x, increases, and the reverse. So the two branches of a spinodal 

 curve approach each other with increase of the temperature. But I 

 shall not enter into a discussion of the further particulars which 

 might occur when this formula is applied. By elimination of dv I 

 shall only derive the differential equation of the spinodal line when 

 we think it given by a relation between p, x and T. We find then: 



Kdx*) 1 \dx) Vi T\\d^) p> Ad^) q ,TA ^ Tl K ^ \dpJwWMj 



for a plaitpoint the factor of dx disappears, and we find back the 

 equation (4). Verslag K. A. v. W. Mei 1895, for the plaitpoint curve. 

 At constant temperature we find for the spinodal curve : 



d 2 v 

 dp\ fdp\ } \ilx* 



spin 



1® J sain \dxja J f <P r 



ax' 



(To be continued). 



51* 



