246 ELEMENTARY CHEMICAL MICROSCOPY 



TABLE IV. 

 MEDIA FOR REFRACTIVE INDEX DETERMINATIONS. 1 



For the lower ranges of refractive indices the following mixtures have been found 

 to be satisfactory. The components being: Acetone, n = 1.558; Petroleum, 

 n = 1.443; Turpentine, n = 1.474. 



1 These mixtures were determined experimentally in the Department of Chemistry, 

 Cornell University, by Mr. C. W. Mason. Above n = 1.45. Wright's Series Table II, should 

 be used. 



