to Calcium and Magnesium Metasilicates. 



23 



metasilicate has no such influence. The 4*3 per cent of diop- 

 side in pseudo-wollastonite was cooled from 1209° to 1050° 

 during a period of 1J hours without producing any change 

 in the crystal form. In the diagram, fig. 1, we have drawn a 



Fig. 7. 



Ti T 



Fig. 7 shows under what conditions the inversion point of a solid is 

 depressed after the formation of a solid solution. 



dotted line through the points where this series of solutions 

 was actually observed to invert, but it must not be accepted as 

 a true inversion line. The inertia of these mix-crystals of wol- 

 lastonite causes them to exhibit a curious and variable behavior 



Fig. 8. 



1 T i 



Fig. 8 shows under what conditions the inversion point is raised after 

 the formation of a solid solution. 



