(577 ) 

 puiiit, and form in this way a loop, as is separately represented below. 



The point of tangency m lies on the niininiiini cin've. 



With concentrations still richer in A, the character of the bound- 

 ing curves remains the same, only the point m shifts along the 

 minimum curve towards iV, so that, when we choose the concen- 

 tration corresponding wuth the point X, the bounding curve gets 

 this shape, where the vapour branch as well as the liquid branch 

 touches the three phase line at N. 



If we now pass on to greater concentration of A, we get again 

 l)0unding curves of the usual form, for the point of tangency m lies 

 now in the metastable region. If the critical point of the bounding 

 curve, coincides with the maximum temperature of the plaitpoint 

 curve then m lies at the absolute zero point. Leaving further parti- 

 cularities undiscussed, I will only just point out that the minimum 

 curve, beyond the point X towards lower temperatures, lies below 

 the three phase line, which is necessary, because the supersaturate 

 solution has a smaller vapour tension than a saturate one and it is 

 wanted for the realisation of the metastable branch of the minimum 

 curve that the solid substance does not make its appearance. 



Now as to the T-X-projection on fig. 3 Ave may still remark, 

 that in accordance with the foregoing remark the liquid line qF'Xq' 

 cuts the vapour line qF Xq' in X at a temperature and pressure 

 lying somewhat below that of the maximum sublimation point F', 

 but slightly above that of the minimum point M of the three phase 

 line. In ^V vapour and liquid are therefore of the same concen- 

 tration, but this is not the case at the minimum M. 



In fig. 3a the projection is represented of the two phase regions 

 coexisting with solid substance on the ^>,,r-plane, which diagram does 

 not call for furlher elucidation. 



Ains/,'i'(/<int, December 1905. 



Aiwryduic-Cliemical-labomtory of the University. 



40* 



