1398 
stances with which the solutions are saturated, the composition 
of such a solution has been determined and in addition that of the 
correlated residue. 
As shown in the table, four solutions of branch cd and their 
correlated residues have been determined besides the two terminal 
points; if these are introduced into the figure and the conjugation 
lines are drawn, these intersect the side MnSO,— NasS04 in a point 
indicating 48.89 °/, of Mn SO, and consequently 51.11 °/, of Nas SOx. 
The double salt Mn 504. Nas SO, contains, however, 51.53 °/, of 
Mn SOq, therefore, 48.47 °/, of NasSO4, so that the solid substance 
with which the solutions of branch cd are saturated cannot be the 
double salt Mn SO,.Na2S0, or one of its hydrates. If from the 
composition (°/, by weight) of the point of intersection we calculate 
the molecular composition we find: (Mn SO)s (Naz SO4)10 = Do.10. 
As shown in the table, four solutions of branch dc and their corre- 
lated residues have been determined besides the two terminal points 
b ande; these four conjugation lines intersect the side Mn SO4,— Nas SOx 
in a point indicating the composition of the double salt: MnSO4 
(Na2S04)3 = D3. This double salt contains 26.16 °/, of Mn SO, and 
consequently 73.84°/, of Naz SOs. 
The behaviour of both double saits in regard to water is shown 
at once in the figure if we connect therein the apex W with the 
points Dj3 and Doro. As the line W.Djs intersects the curve dc and 
the line W.Do1o the curve cd, it is evident that at 35° both double 
salts are soluble in water without decomposition. 
