( 727 ) 



Physics. — "Contribution, to the theory of binary mixtures, //'', l>y 

 Prof. J. D. van der Waals. (Continued, see p. 621). 



Not to suspend too long the description of the course of the j-lines 



in the ease that the locus —— = exists, we shall postpone the dctcr- 



dx* ' ' 



mination of the temperature at which this locus has disappeared, 



and the inquiry into the value of x and v for the point at which 



it disappears — and proceed to indicate the modification in the 



course of the g-lines which is the consequence of its existence. 



dv 



From the value of — — = 



dx„ 



dhv 



dx* 

 dxdv 



follows that when a ^-line 



passes through the curve — - = 0, it has a direction parallel to the 



dx 2 



lig. 3. 



