( 844 ) 



/JU \ 



f — 1 may already account for the fact that the peculiar feature of 

 \dm) ' 



this phenomenon disappears more and more when, retaining ethane, 

 we choose an alcohol with larger value of 6; so that the phenomena 

 point to the fact that a normal plaitpoint line might be expected if 



we proceed in the series of the alcohols. As condition for — 



being negative in the critical circumstances, we had: 



'dbV </'-'" 



1 \,l.rj 9 >l.r* ^ n 



.r(l-.r) 4 A 5 



For in general it is to he expected that this value cannot so 



db 

 easily be realised for large value of— than e.g. for almost equal 



tl.r 



value of b y and b,. That the mixture of ethane with methyl alcohol 

 displayed quite different phenomena might already be expected on 

 account of the fact that we have then a ease for which with in- 

 creasing value of b the value of 7/ decreases. It is viz. almost sure 

 that b is smaller for methyl alcohol than for ethane. 



If for T= Tk the curve — =0 should already partially project 



1 </.r 5 



above -=0, this will bring about but little change in the pheno- 



dv* 

 inenon. Only the minimum value of T v \ will descend below 

 Tk, in the (T p i , x)-ftgare. In the same way the left cusp will have 

 to be drawn at lower value of T than 7), . 



It is, therefore, required for the course of the plaitpoint pheno- 

 mena, that 7;, > 1\, and so according to the value of I g (p. 830). 



d'a 



S" n A 1 - 9s) \ 8 a i 



b l 



In this inequality x, dependent on the value of ——, lies between 



— and — , and y q between — and 0. Let us write: 

 3 2 2 



a. (I+.V7) 27 ( 6 i 



6,-6, 



