AND DISPERSION IN ICELAND SPAR. 
437 
Also from Table VIII. 
NM = 14° 23' 11 " + <£' 
Hence 
v=72° 44' 39" [From Section III. (9).] 
p-MN=58° 21'28.(13) 
From these values we can obtain the values of 6 corresponding to the angles of 
incidence in Tables I., II., III., and IV. 
Table X.—Theoretical results for the line C. 
e. 
Prom Theory. 
r 
From Experiment. 
Excess of 
Experiment. 
I. 
O / // 
3 20 42 
1'65368 
1"65367 
- 1 
I. 
2 31 33 
1-65393 
1-65393 
0 
I. 
1 31 16 
1-65422 
1-65416 
- 6 
I. 
0 20 35 
1'65435 
1-65438 
+ 3 
I. 
0 59 31 
1-65430 
1-65431 
+ 1 
I. 
2 28 17 
1-65399 
1-65395 
- 4 
I. 
4 5 7 
1-65335 
1-65335 
0 
I. 
5 48 58 
1-65231 
1-65223 
- 8 
I. 
7 39 25 
1-65082 
1-65078 
- 4 
I. 
9 35 35 
1-64883 
1-64873 
-10 
I. 
11 34 51 
1-64635 
1-64627 
- 8 
I. 
11 37 2 
1-64631 
1-64623 
- 8 
I. 
13 36 26 
1-64340 
1-64335 
- 5 
I. 
15 32 41 
1-64018 
1-64021 
+ 3 
I. 
17 23 14 
1-63678 
1-63684 
+ 6 
I. 
19 6 50 
1-63332 
1-63341 
+ 9 
I. 
20 42 48 
1-62989 
1-62991 
+ 2 
I. 
22 9 42 
1 "62660 
1-62669 
+ 9 
II. 
22 35 37 
1-62560 
1-62580 
+ 20 
I. 
23 27 13 
1-62355 
1-62356 
+ 1 
II. 
23 34 31 
1-62326 
1-62352 
+ 26 
I. 
24 33 38 
L 62085 
1-62095 
+ 10 
II. 
24 43 31 
1'62044 
1-62064 
+ 20 
I. 
25 28 23 
1-61855 
1-61862 
+ 7 
II. 
26 2 20 
1-61711 
1-61734 
+ 23 
I. 
26 10 27 
1-61676 
1-61680 
+ 4 
II. 
27 29 59 
1-61329 
1-61345 
+ 16 
II. 
29 6 13 
1-60897 
1-60919 
+ 22 
II. 
30 50 5 
1 "60418 
1-60438 
+ 20 
11. 
32 41 11 
1-59893 
1-59912 
+ 19 
II. 
34 38 48 
1-59326 
1 "59350 
+ 24 
II. 
36 42 26 
1-58721 
1-58745 
+ 24 
II. 
38 51 35 
1-58078 
1-58107 
+ 29 
II. 
41 0 26 
1-57443 
1-57449 
+ 6 
III. 
42 53 57 
1-56879 
1-56883 
+ 4 
11. 
43 6 36 
1-56817 
1-56820 
+ 3 
III. 
43 12 34 
1-56787 
1-56789 
+ 2 
III. 
43 43 44 
1-56634 
1-56640 
+ 6 
III. 
44 27 0 
1-56420 
1-56431 
+ 11 
3 L 
MDCCCLXXX. 
