to Calcium and Magnesium Metasilicates. 

 Fig. 4. 



17 



























































/ 



































































/ 

































































/ 













i 























































/ 













1390° < 





















































/ 



































































/ 



























































■s 

























































































1370° 















































-*■ 























































































1360° 















\ 















































































* -i 



►■ 















































y 



<r 



























































• 



s 



r"' 





























































< 



f 







, 





























































































































Temperature-time curves showing thermal behavior of mixtures rich in MgSi0 3 . 

 Curve I-I, 60 % MgSi0 8 . II-II, ?0 % MgSi0 3 . 



Fig. 5. 



1410 c 



1400° 



1390° 



1380° 



1370° 



1350° 



1340° 



Temperature-time curves showing thermal behavior of mixture rich in MgSi0 3 . 



Curve III. 65 % MgSi0 3 . 



IV. 75 % MgSi0 3 crystallized below 1300° by heating the glass. 



V. To % " " not far below 1365°. 



VI. 80 £ " " " " ." " 



VII. 90 £ " " l < " " 



VIII. 95 £ " " " " " 



Am. Jour. Sci. — Fourth Series, Vol. XXVII, No. 157.— January, 1909. 

 2 



