Ferguson and Merwin — The Ternary System. 93 



until it contains at equilibrium mere traces of crystalline 

 matter immersed in a liquid. This crystalline material 

 may consist of one, two or three phases. Compositions 

 which under these conditions contain one crystalline 

 phase will form an area; those which contain two crys- 

 talline phases will form a line, and those which contain 

 three such phases will be points on a triangular concen- 



Fig. 8. 



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3oundar/es *d/rect/y determined; Boundaries obtained by interpo/at/on ;■*■+*■, ffi& So/id so/ut/on. 



• Composition investigated; ® Compounds. 



Fig. 8. — The triangular concentration diagram giving the compositions 

 investigated and the limits of the fields of stability of the various phases 

 in wt. per cent. 



tration diagram. The area belonging to any crystalline 

 phase is called its field of stability, and the lines and 

 points just referred to represent the boundaries of the 

 fields. The fields of stability and the compositions of the 

 charges used to determine their limits are shown in fig. 8. 

 Table I presents the results upon which this diagram is 

 based. 



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