( 612 ) 



On raising- the temperature over 30° the two heterogeneous 

 regions gradually approach each other and finally unite; at what 

 temperature this happens has not been determined, but from the 

 experiments it is shown that this is already the case below 40'; 

 I have also not been able to determine whether this point of con- 

 fluence is situated in front or behind the curve Ac, or perhaps 

 accidentally on the same. 



I have closely investigated the equilibria occurring at 50° and 

 represented the same by figure 3; any further explanation is super- 



\m 



Fig. 3. 



fluous. I must, however, say something as to the points c x and c 2 , 

 namely the intersecting points of the curve Ac with the saturating 

 curve of the two liquid phases: 6^, and 6 3 o? a . At first sight we 

 might think that these two liquids may be in equilibrium with each 

 other. That possibility, of course, exists. Suppose we take a water- 

 alcohol mixture of such composition that two liquid phases occur on 

 saturating with LiNH 4 S0 4 . Both liquids will now contain Li 3 S0 4 



