84 Ferguson and Merwin — The Ternary System. 



Fig. 1. 



Z80Q- 



2700- 



2600- 



2500 



2400 



2300- 



CaO 



JfyO + Tfdt 



CaO+S(elt- 



CaO +-J? 9 



2800 

 2700 

 2600 

 2500 

 2400 

 2300 

 S£ 9 



Fig. 1. — The binary system CaO-MgO. weight per cent. 



Fig. 2. 



5X0 2 



CaA)SM/ 3GiQZ5iQ y Z&D5jL0/ ^QOJjlO' 



Fig. 2. — The binary system CaO-Si0 2 . weight per cent. 

 Fig. 3. 



CxO 



1900 



1850 



1800 



1750- 



1700 



1650- 



1600 



1550 



1500 



SzO„ 



-/felt 



Cristobalite ^yfelt 



■5z0 £ 

 +F(e£t- 



Crv-itobalvte, +JfyO ■ SzO^ 



iO-5iO z 

 JTgO-SiO^ 



JTyO^Jfe/J; 



-mo 



-1850 



jf^0^27^0-3iO £ 



1750 

 1700 

 1650 

 1600 

 1550 

 1500 



5iO z TridgnwU. 



* WqOSiO^ 



5^ 



JfyO 



Fig. 3. — The binary system MgO-Si0 2 . weight per cent. 



