( 822 ) 



lil the svsloui: ».v;\lei', alcohol, amiiioiiimu f^iilphalo jiihI inaiif!,ancse 

 sulphate quite dilfereiit e(|uilil»ria occur. The results of Ihis investi- 

 gation for 50^ are represented in fig. 'A-, this is again the projection 

 of the tetrahedron on a plane parallel to the sides WA and MnN. 

 The angular points II', A, N and Mn indicate the components : 

 ^vater, alcohol, anlmonium sulphate and nianganese sulphate. 





In this system an anhydrous compound (Mn SOjj (NH^), SO^ occurs 

 at 50° which is reprosented in the tigure by the point D^ . The 

 Mn S()^ gives at that temperature the compound Mn SO^ . H.jO, 

 represented liy the point Mn^ . 



On the side plane MnWJV wo find the equilibria in the ternary 

 system water, manganese sulphate, ammonium sulphate. Three satura- 

 lioii lines are found: sr is thai of the Mn S( )^ . ll.^(), rtq that of the 

 double salt /)., , and (j/> that of the Mn SO^ . As the line IFZ), , 

 intersects the saturation line of the double salt in t this is soluble 

 in water without decomitosition ; t represents this saturated solution. 



'i'he isotherm .sx, which indicates the equilibria in the ternary 

 system water, alcohol, manganese sulphate consists of two saturation 

 lines of whi(di only one ss^ has been determined. This indicates the 

 solution saturated with Mn SO^ . HjO ; to this should join a saturation 



