Ferguson and Merwin — The Ternary System. 187 



(2) Rankin and Wright, 22 when attempting to synthe- 

 size the tricalcium silicate from the oxides, noted first the 

 formation of the orthosilicate with a subsequent combi- 

 nation of this with lime to form the tricalcium silicate. 



(3) Bowen 23 found that unstable carnegieite formed 

 as an intermediate stage in the crystallization of nephe- 

 lite from undercooled glasses when the temperature was 

 not far below the decomposition temperature of the 

 nephelite. 



Fig. 7. 



Fig. 7. A second view of the model given in fig. 6, intended especially to 

 indicate the inversion and decomposition temperatures of the various solid 

 solutions. 



(4) Pure pseudowollastonite crystallizes readily from 

 glasses of its own composition several hundred degrees 

 below the temperature of its inversion to wollastonite. 



(5) In cases in which a single low-temperature phase 

 decomposes with increasing temperature to form two or 

 more phases, we have found one or more of these phases 

 initially present in charges of glass which had been crys- 



22 This Journal (4), 39, 8, 1915. 



23 This Journal (4), 33, 551, 1912. 



