THE VARIATION OF ANGLES OBSERVED IN CRYSTALS, 
501 
Table III. 
No. 
m . 
p. 
t. 
1 
21-253 
1-35961 
19 
2 
19-226 
1-35439 
19 
3 
15-667 
1-34957 
19 
4 
14-134 
1-34806 
19 
5 
12-729 
1-34627 
19 
6 
11 - 455 
1-34497 
19 
7 
10-298 
1-34388 
19 
8 
9-268 
1-34274 
19 
9 
8-321 
1-34192 
19 
10 
7-466 
1-34111 
19 
11 
6-696 
1 - 34035 
19 
12 
6-003 
1-33850 
19 
The above observations are rejjresented by circles on Diagram 1. 
Table IV.—Isolated Detenniiiations made by Method of Minimum Deviation. 
No. m. 
IX. 
t. 
ix at 19°. 
1 7-7198 
1-34083 
o 
19 
1-34083 
2 1 7-7339 
1-34088 
164 
1-3406 
3 ! 4-897 
1-33817 
18 
1-3381 
4 4-575 
1 - 33825 
17 
1 - 3380 
5 2-304 
1-33622 
17 
1-3360 
6 1-156 
1-33424 
154 
1-3340 
The above observations are represented by crosses on Diagram 1. 
(2.) Refractive Indices of Solutions of Tartaric Acid. 
The refractive index and composition of a saturated solution of tartaric acid were 
determined as follows 
m = grammes of substance in 100 grammes of solution. 
^ ziz refractive index. 
111. 
IX. 
/. 
58 - 489 
1-41672 
o 
19 
By minimum deviation. 
58-489 
1-41667 
20 
% 
1-41649 
19 
n 3 5 5 3 
