92 PROCEEDINGS OF THE PRINCETON MEETING 



PHYSICAL-CHEMICAL SYSTEM, LIME-ALUMINA-SILICA AND ITS GEOLOGICAL 



SIGNIFICANCE 



BY FRED E. WRIGHT AND G. A. RANKIN 



(Adstract) 



The laboratory work on this system is now practically finished. A model, 

 illustrating the temperature equilibrium conditions for the system, has been 

 made and serves to indicate the course of crystallization of the different phases 

 which occur throughout the system. The bearing of the relations thus ob- 

 tained on petrogenetic theory was outlined briefly. 



Presented in abstract without notes. Eemarks were made by Messrs. 

 C. W. Parmelee and J. E. Pogue. 



The Society adjourned at 4.15 o'clock p. m. 



