THE VARIATION OF ANGLES OBSERVED IN CRYSTALS. 
50 
Table XIII.—Series of Consecutive Determinations made by the Method of Total 
Pteflection. 
No. 
m. 
9. 
jX. 
t. 
ji at 19°. 
1 
45-037 
2°3 22 
1-38716 
18°-2 
1-38706 
2 
41-949 
23 
1-38433 
18 
1 - 3840 
3 
39-258 
22 51 
1-38108 
18 
1 - 3808 
4 
36-891 
22 344 
1-37780 
18 
1-3775 
5 
34-793 
22 204 
1-37500 
18 
1-3747 
G 
32-922 
22 9 
1-37268 
18 
1-3724 
7 
31-242 
22 0 
1 - 37086 
18 
1-3706 
8 
28-347 
21 42 
1-36719 
18 
1-3669 
9 
24-888 
21 224 
1-36317 
18 
1-3629 
10 
23-OlG 
21 11 
1-36080 
181 
1-3606 
11 
21-406 
21 1 
1-35872 
181 
1 - 3585 
12 
20-006 
20 54 
1-35726 
18i 
1 - 3570 
13 
18-219 
20 45 
1 - 35538 
184 
1 - 3544 
The above observations are represented ])y dots in Diagram IV. 
Table XIV.—Series of Consecutive Determinations made by the Method of Total 
Heflection. 
No. 
VI. 
9. 
IX. 
t. 
jx at 19°. 
1 
54-506 
23 54 
1 - 39332 
o 
30 
1-3966 
2 
47-855 
23 10 
1-38482 
314 
1 - 3885 
3 
42-650 
22 47 
1-38029 
324 
1-3843 
4 
38-467 
22 27 
1-37630 
324 
1 - 3803 
5 
35-031 
22 15 
1-37389 
26 
1-3760 
6 
32-158 
22 1| 
1-37116 
23i 
1-3724 
7 
29-721 
21 45 
1-36780 
23 
1-3690 
8 
27-627 
21 344 
1-36565 
22 
1-3665 
9 
25 - 809 
21 23 
1-36328 
22 
1-3642 
10 
24-212 
21 13 
1-36121 
21 f 
1-3620 
11 
22-807 
21 
7 
1-35997 
19 
1-3600 
12 
21-554 
21 
1 
1-35872 
19 
1-3587 
13 
19-419 
20 48 
1-35600 
19 
1-3560 
14 
17-669 
20 38 
1-35391 
19 
1 - 3539 
The above observations are represented by dots in Diagram IV. 
All the above experiments indicate that the composition of a supersaturated, a 
saturated, or a strong solution may be ascertained with a certain degree of accuracy 
by determining the refractive index by means of a totally reflecting prism ; there 
