THE DETERMINATION OF REFRACTIVE INDEX 245 



Table II. 



LIQUIDS FOR DETERMINATION OF REFRACTIVE INDICES 

 OF MINERALS, CRYSTALS, ETC. 



Wright's Series. 



Bui. 158, Carnegie Institute. 



This series requires the use of but few liquids and keeps the dispersion of the liquids within 

 narrow limits throughout the series. As prepared for use, each one of the series should differ 

 from the next above or below by 0.005. The value of n in each mixture made must first be de- 

 termined by means of a refractometer. 



Table III. 

 MEDIA FOR REFRACTIVE INDEX DETERMINATIONS. 1 



Weighing out and grinding together in a mortar the weights of the substances given in the 

 table, a series of eutectics is obtained, each of which will have the refractive index indicated in 

 the first column. Checking with a refractometer is unnecessary. 



Refractive 

 index. 



I.487 



I-505 



1-535 



i-54 



1-55 



1-56 



i-57 



1.58 



i-59 

 1 .60 

 1.605 



Components in grams. 



Thymol 35 



Thymol 67 



Salol 60 



60 



60 



60 



60 



, 6c 



60 



60 



60 



Camphor . 



65 

 33 

 40 

 40 

 40 

 40 

 40 

 40 

 40 

 40 

 40 



Alpha-naphthyl- 



amme 



14 

 24 

 34 

 44 

 60 

 82 

 100 



1 Merwin, J. Wash. Acad. Sci., 3 (1913), 35- 



