JV. L. Bowen — The Binary System. 



555 



Diagram I. 



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mixture with 10 per cent CaAl 2 Si 2 8 are shown by small 

 circles and are undoubtedly due to inversion. 



Quenchings. 



In Table I there are many blanks. Doubtless, some of jthese 

 could have been filled in by especially careful work with heat- 

 ing curves, but a different method was adopted for obtaining 

 the same information. 



The use of the quenching furnace 2 combined with the micro- 

 scopic examination of the charges offers a trustworthy method 



