LIEUT.- COLONEL SABINE ON TERRESTRIAL MAGNETISM. 
121 
Observations of Declination. (Continued.) 
Lat. 
Long. 
Ship. 
No. of 
observa- 
tions. 
Declina- 
tion. 
Lat. 
Long. 
Ship. 
No. of 
observa- 
tions. 
Declina- 
tion. 
O 
-75 
40 
O 
174 
56 
Terror. 
5 
O 
-76 
03 
— 58 
50 
222 
00 
Terror. 
4 
-16 
03 
-76 
48 
182 
33 
Erebus. 
6 
-86 
23 
-58 
58 
227 
00 
Terror. 
1 
-17 
01 
-76 
54 
182 
17 
Terror. 
3 
-82 
28 
-59 
04 
229 
00 
Erebus. 
4 
-17 
49 
-76 
12 
191 
40 
Terror. 
2 
-70 
22 
-60 
18 
236 
30 
Terror. 
3 
— 20 
57 
-76 
42 
194 
37 
Erebus. 
10 
-79 
57 
-60 
14 
236 
32 
Erebus. 
3 
-20 
56 
-76 
46 
194 
40 
Terror. 
8 
— 81 
23 
-60 
02 
240 
31 
Terror. 
1 
-20 
48 
-78 
03 
197 
31 
Erebus. 
10 
-87 
31 
-59 
17 
245 
40 
Erebus. 
1 
-20 
14 
-77 
57 
197 
54 
Terror. 
8 
-88 
01 
-58 
28 
251 
40 
Terror. 
4 
-22 
46 
-77 
44 
198 
07 
Erebus. 
10 
-88 
08 
-58 
40 
251 
52 
Erebus. 
3 
— 21 
47 
—75 
17 
195 
06 
Terror. 
5 
-64 
33 
— 58 
40 
254 
59 
Erebus. 
4 
— 23 
28 
-74 
49 
193 
56 
Erebus. 
6 
—62 
17 
— 58 
36 
255 
20 
Terror. 
7 
— 24 
46 
-71 
56 
186 
36 
Erebus. 
2 
-45 
11 
-58 
46 
257 
50 
Terror. 
3 
-26 
13 
-71 
08 
184 
54 
Erebus. 
5 
-39 
20 
-58 
46 
258 
07 
Erebus. 
3 
— 25 
25 
-70 
58 
184 
03 
Terror. 
3 
—38 
26 
-59 
00 
267 
56 
Terror. 
8 
-26 
25 
-70 
10 
180 
20 
Terror. 
3 
— 31 
26 
-59 
01 
268 
34 
Erebus. 
9 
-26 
17 
-69 
50 
180 
16 
Erebus. 
12 
-30 
50 
-59 
02 
272 
04 
Erebus. 
1 
-26 
51 
-68 
17 
183 
27 
Erebus. 
12 
-27 
32 
—59 
04 
272 
20 
Terror. 
4 
-27 
08 
-68 
02 
183 
35 
Terror. 
4 
-28 
50 
— 58 
51 
276 
04 
Erebus. 
5 
-26 
18 
-67 
30 
185 
00 
Terror. 
7 
-29 
46 
-58 
55 
276 
26 
Terror. 
7 
— 28 
25 
-67 
25 
186 
42 
Erebus. 
4 
-27 
32 
— 58 
21 
279 
48 
Terror. 
10 
-27 
13 
-65 
51 
190 
25 
Terror. 
6 
-25 
02 
-58 
20 
280 
27 
Erebus. 
5 
-25 
04 
—65 
07 
192 
24 
Erebus. 
7 
— 23 
40 
-58 
30 
282 
00 
Terror. 
10 
-26 
49 
-63 
33 
194 
53 
Erebus. 
l 
-21 
57 
-58 
30 
282 
05 
Erebus. 
8 
-26 
14 
-62 
26 
195 
40 
Terror. 
4 
-19 
41 
— 58 
32 
283 
40 
Erebus. 
7 
—26 
18 
-62 
20 
196 
15 
Erebus. 
5 
-19 
51 
-58 
29 
283 
33 
Terror. 
8 
-26 
13 
-61 
00 
199 
00 
Terror. 
4 
-19 
49 
-57 
35 
288 
54 
Terror. 
1 
-25 
16 
-61 
02 
199 
25 
Erebus. 
8 
-18 
42 
-56 
46 
294 
30 
Terror. 
2 
-20 
26 
-60 
20 
205 
12 
Terror. 
4 
-18 
20 
-52 
14 
301 
09 
Terror. 
4 
-18 
25 
-60 
26 
203 
26 
Erebus. 
4 
-17 
31 
-52 
16 
301 
06 
Erebus. 
6 
-16 
29 
-60 
16 
212 
59 
Erebus. 
4 
-17 
01 
f On shore "] 
-60 
05 
213 
51 
Terror. 
6 
-17 
19 
-51 
32 
301 
53 
< at Port > 
.... 
-17 
36 
-58 
59 
220 
30 
Erebus. 
6 
— 15 
30 
[ Louis*. J 
* The mean monthly results with the magnetometers of the Expedition at the observatory at Port Louis at 
the Falkland Islands were as follows : — 
April . . . 
1 
to 
23. 
-17 
50-3' 
May . . . 
1 
to 
31. 
-17 
43-7 
June . . . 
1 
to 
30. 
-17 
38-1 
July . . . 
1 
to 
31. 
-17 
35-6 
August . . 
1 
to 
31. 
-17 
33-0 
September 
1 
to 
30. 
-17 
32-3 
October . 
1 
to 
31. 
-17 
G* 
O 
CO 
November 
1 
to 
26. 
-17 
26 - 7_j 
Mean corresponding to 
August 15, 1842. 
-17 36-2. 
The easterly declination appears to be decreasing very rapidly at the Falkland Islands. 
