( so;} ) 



line \\\i\\ llic uiilivdroiis l\IiiS(), ;is solid phase which however, has 

 not i)ceii determined. 



The e(|ninhi-ia occuiTini'- in the ternai'v .svstein : water, alcohol, 

 ammoninni sulphate are represented in the plane ir/liV by the 

 isotherm /7>i«y>2/>3 ; this consists of t'.'e saturation lines pi)^ and 

 /j-iP^ of the ammonium sulphate and of the branch />i«y>.j of a binodal 

 line with the critical li(piid ((. The points y>j and y>.^ therefore represent 

 two ternary conjugated liquids satui'ated with ammonium sulphate. 



The ({ualernary equilibria are represented by four surfaced: 



sn\ö\ is the saturation surface of the Mn SO^ . H^O 



rtqq^^q^qf,i\ is the saturation surface of the 1J>.\ 



^1PP\1\ and 72/>g/>8</, are the saturation surface of the ammonium sulphate 



y>i<(/>.//j|if/, is tlu^ binodal surface. 



The latter surface is divided in two parts by the critical line «/:?; 

 with each point of the one })art, a [)oint of the other is conjugated; 

 a similarly conjugated ])air of points represents a pair of (piaternarly 

 conjugated li((uid |)hases. The l)inodal surface, therefore, represents the 

 equilibria liquid -j- li<lidd. 'I'he sections of the four saturation surfaces 

 give three saturation lines. 



ri\ I'epresents the solutions saturated with Mn SO^ . H^O + D2. i 

 (/^i and (7,^3 represent „ „ „ „ (NHJ, SO, + D2. 1 



q^i^q^ represents the conjugated liquid pairs saturated with ammonium 

 sulphate. The point /? is the critical solution saturated witli ammo- 

 nium sulphate. 



If a plane is brought through the side WA and the point 

 D-2.\ this intersects as far as has been determined the saturation 

 surface of D-2.\ in the curve tt^; the double salt is therefore not 

 only soluble in water but also in dilute alcohol without decomposition. 



At 25° (piite different equilibria occur in this system ; on the side 

 plane \V Mn A a new area of immiscibility is developed. At the 

 same time the double salt Do. 1 = (Mn SOJ, (NH)J, SO, disappears 

 in order to make room foi- the double salt Mn SO, . (NH,),, SO, . 611,0. 

 The resulting equilibria much resemble those mentioned previously 

 which occur at 30^ in the system : w\ater, alcohol, ammonium sulphate 

 tind lithium sulphate. 



I will therefore not discuss these equilibria any further. 



