224 Absteacts of the Makeestoun Obseevations, 1843. 
TABLE III. — Mean Westerly Declination at the Observation Hours for each Month in 1843. 
Month. 
18. 
20. 
22. 
23. 
0. 
2. 
4. 
6. 
8. 
10. 
1843. 
25° 
25° 
25° 
25° 
25° 
25° 
/ 
25° 
25° 
25° 
25° 
January 
24-29 
24-96 
24-58 
27-50 
28-95 
27-13 
25-85 
25-04 
24-03 
February 
23-94 
24-21 
24-71 
27-84 
29-41 
27-65 
25-92 
23-97 
21-06 
March 
22-65 
23-14 
22-83 
27-15 
29-78 
28-52 
25-14 
24-05 
21-85 
April 
21-36 
20-67 
22-78 
27-78 
31-19 
28-37 
24-06 
22-32 
21-45 
May 
20-76 
19-79 
21-95 
27-05 
29-72 
27-05 
24-55 
23-63 
22-54 
June 
21-69 
20-56 
23-39 
28-91 
31-70 
29-52 
26-15 
25-34 
25-00 
July 
20-44 
20-09 
22-17 
27-17 
30-04 
27-71 
25-15 
23-48 
21-42 
August 
September 
19-80 
18-48 
21-77 
26-89 
29-31 
26-15 
22-47 
21-15 
21-26 
19-48 
19-55 
20-74 
25-82 
27-51 
24-94 
21-29 
18-98 
16-76 
October 
20-97 
21-46 
21-84 
26-37 
26-67 
24-14 
21-90 
20-66 
18-77 
November 
18-55 
18-80 
18-97 
20-37 
22-02 
22-06 
20-99 
19-76 
17-93 
17-43 
December 
19-00 
19-02 
19-56 
20-53 
21-57 
22-42 
21-05 
19-73 
17-27 
16-69 
Mean 
21-08 
20-89 
22-11 
26-34 
2S-23 
26-10 
23-50 
21-98 
20-69 
The above Table is intended chiefly as a key for comparing the tabular observations. 
The mean at 18 h in January is rendered comparable with the means at the other hours thus : the daily means 
from January 9 to 14, being the means of 8 daily observations, were corrected by — 0'T4, obtained, as for Table I., 
in order to reduce them to the mean of 9 daily observations, then 
Mean Westerly Declination, January 9 — 31, ..... = 25 83 
January 16—31, =26-25 
Difference, ......= 0-42 
Tbe mean for 18 h , deduced from the observations January 16 — 31, was therefore corrected by — 0-'42, in 
order to reduce it to the mean from January 9 — 31 as for the other hours. 
Secular Change. 
By comparing the means at 20 h , 23 h , 2 h , and 5 h , the observation hours in 1842 (Table I., p. 136, 1842), 
22' 1 + 0 11 4 h + 6 h 
with the means at 20 h , , 2 h and — - — for 1843, we obtain the following results for the yearly retro- 
gression of westerly declination : — 
20 h 
23h 
2h 
/ 
5b 
1842, 
26-61 
29-80 
33-80 
30-40 
1843, 
20-89 
24-22 
28-23 
24.80 
Difference, 
5-72 
5-58 
5-57 
5-60 
Mean, .... 5-62. 
