246 
ELEMENTARY CHEMICAL MICROSCOPY 
Table IV. 
MEDIA FOR REFRACTIVE INDEX DETERMINATIONS.^ 
For the lower ranges of refractive indices the following mixtures have been found 
to be satisfactory. The components being: Acetone, n = 1.358; Petroleum, 
11 = 1.443; Turpentine, n = 1.474. 
Refractive Index. 
Acetone. 
Petroleum. 
Turpentine. 
1-37 
225 c.c. 
35 C.C. 
00 
200 
85 
1-39 
150 
100 
I . 40 
125 
120 
1.41 
ICX) 
200 
1.42 
100 
300 
1-43 
so 
250 
1.44 
30 
300 
5 C.C. 
1.45 
23 
180 
,0 
1 These mixtures were determined experimentally in the Department of Chemistry, 
Cornell University, by Mr. C. W. Mason. Above n = 1.4s, Wright's Series Table II, should 
be used. 
