266 E. 8. Larsen — Relation between the Refractive Index 



Fig. 2. 



M 



/■fi? 























































































\ 













































\ 









































\ 



*, 



\ 





\ 

































*fif 





\ 





\ 



\ 



\ 





































\ 





\ 



\ 



\ 





































\ 





\ 



\ 







































\ 



s 



\ 



\ 







































\ 



\ 



V, 



\ 

























7-6 f 













*N 



\ 



\ 



V 



\ 





































\ 



V 



\ 



\ 



\ 





































\ 





\ 



\ 



\ 







































\ 





\ 







































\ 







\ 

















/•60 























\ 



\ 









































\ 



\ 



\ 













































\ 





s 







































\ 



\ 



\ 







































\ 



\ 



\ 



\ 









/•^ 































\ 



\ 



\ 



\ 





































\ 



\ 



\ 



( 



S 





































\ 



V 



\ 



\ 







































\ 



\ 



\' 



\ 







































\ 



\ 



N 



f-.TFI 





































( 



\ 



\ 









































\ 



\ 











































\ 













































Mo; 



U 



10 



CaSiO s 



10 



30 40 SO 60 



70 



80 90 100 



MgSi0 3 



As shown in the columns headed N Th — N Li the dispersion 

 varies continuously, within the limits of error, between the 

 end members in both series. The next column, headed 



