PEN. KD 20 30 40 50 69 70 80 90 AgNO, 
Mol. pCt. 
The meltingpoint and the two eutectic points for doublesalt 
+ AgNO, and double salt + TINO; do not perceptibly differ. 
The short line C E D of the doublesalt is, therefore, almost 
horizontal. As a consequence of the fact that the points C and 
D lie so close to 50 percent, the solidification trajectory that is 
the series of temperatures at which solidification takes place, is very 
prolonged for fused mixtures containing much Ag NOs or TI NOs. 
Even in the case of these mixtures, the lines A C and B D may 
pass the points C and D owing to superfusion of the doublesalt. 
Solidification was incomplete even at 80° in the case of mixtures 
containing 90 percent Ag NO; or 90 percent Tl NOs. 
If the doublesalt did not form of its own accord, the eutectic 
point F’ where the melt solidifies to a conglomerate of Ag NO; 
+ TINO; would be noticed at about 75°. 
3. The course of the meltingpoint line admits of two possibilities 
as regards the nature of the crystals which separate from the melt 
