RANGE AND THE PERIOD OF SOLAR SPOT FREQUENCY. 
553 
It may be remarked that if the numbers of Table V. be treated in the way in which 
the numbers of Table I. were treated to obtain those of Table II., the smoothed values 
of Table II. would be similarly obtained. 
The numbers of the preceding table were now employed to form the two lower 
curves of Plate 23, taking one minute of arc of declination as corresponding to ‘0003 of 
horizontal force as before. But the coincidence of the zeros of the scales could not, as 
in Plate 22, be here maintained, because the curves would overlap in such a way as to 
cause great confusion. The variations of magnitude have, of course, the same relation 
as before. 
The upper curve of Plate 23, that of sun-spot frequency, is laid down, not from the 
numbers previously used (for Plate 22), but from the monthly values deduced by Dr. 
Wolf directly from observation, and given in his ‘ Astronomische Mittheilungen/ 
Nos. 38, 39, 42, and 46. As these values are probably not so generally available as 
those used for Plate 22, it has been thought desirable to insert them here. They are 
the numbers from which, by application of the smoothing process before described, 
those used in the construction of the sun-spot curve of Plate 22 were obtained. 
Table VI.—Numbers expressing the relative sun-spot frequency in each month, 
as deduced by Dr. Wolf directly from observation. 
Y ear. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
August. 
Sept. 
October. 
Nov. 
Dec. 
1841 
24-0 
29-9 
29-7 
42-6 
67-4 
55"7 
30-8 
39-3 
35-1 
28-5 
19-8 
38-8 
1842 
20-4 
22-1 
21-7 
26-9 
24-9 
20-5 
12-6 
26-5 
18-5 
38-1 
40-5 
17-6 
1843 
13-3 
3-5 
8-3 
83 
21-1 
10-5 
9-5 
11-8 
4-2 
5-3 
191 
12-7 
1844 
9-4 
14-7 
13-6 
20-8 
12-0 
3-7 
21-2 
23 9 
6-9 
21-5 
10-7 
21-6 
1845 
25'7 
43-6 
43-3 
56-9 
47-8 
31-1 
30-6 
32-3 
29 6 
40-7 
39-4 
59-7 
1846 
38-7 
51-0 
63-9 
69-2 
59-9 
65"1 
46'5 
54-8 
107-1 
55-9 
60-4 
65 - 5 | 
1847 
62-6 
44-9 
85-7 
44-7 
754 
85-3 
52-2 
140-6 
161-2 
180-4 
138-9 
109-6 
1848 
159-1 
111-8 
108-9 
107-1 
102-2 
123-8 
139-2 
132-5 
100-3 
132-4 
114-6 
159 - 5 
1849 
156-7 
131-7 
96-5 
102-5 
80-6 
81-2 
78-0 
61-3 
93-7 
71-5 
99-7 
97-0 | 
1850 
78-0 
89-4 
82-6 
44-1 
61-6 
70-0 
39-1 
61-6 
86-2 
71-0 
54-8 
60-0 
1851 
75-5 
1054 
64-6 
56 "5 
62-6 
63-2 
36-1 
57’4 
67-9 
62-5 
50-9 
714 1 
1852 
68-4 
67-5 
61-2 
65'4 
54-9 
46-9 
42-0 
39-7 
37-5 
67-3 
54-3 
45-4 
1853 
41-1 
42-9 
37'7 
47-6 
34-7 
40-0 
45"9 
50-4 
33-5 
42-3 
28-8 
23-4 
1854 
15-4 
20-0 
20-7 
26-4 
24-0 
21-1 
18-7 
15-8 
22 4 
12-7 
28-2 
21-4 
1855 
12-3 
11-4 
17-4 
4-4 
9-1 
53 
0-4 
3-1 
o-o 
9-7 
4-2 
3-1 
1856 
0-5 
4-9 
0-4 
6*5 
o-o 
5-0 
4-6 
5-9 
4-4 
4*5 
7-7 
7-2 
1857 
13-7 
7-4 
5-2 
n-i 
29-2 
16-0 
22-2 
16-9 
42-4 
40-6 
31-4 
37-2 
1858 
39-0 
34-9 
57*5 
38-3 
41-4 
44’5 
56-7 
55-3 
80-1 
91-2 
51-9 
66-9 
1859 
83-7 
87-6 
90-3 
85-7 
91-0 
87-1 
95-2 
106-8 
105-8 
114-6 
97-2 
81-0 
1860 
81-5 
88-0 
98-9 
71-4 
107-1 
108-6 
116-7 
100-3 
92-2 
90-1 
97-9 
95-6 
1861 
62-3 
77-8 
101-0 
98-5 
56-8 
87-8 
78-0 
82-5 
79-9 
67-2 
53-7 
80-5 
1862 
63-1 
64-5 
43-6 
53-7 
64-4 
84-0 
73-4 
62-5 
66-6 
42 0 
50-6 
40-9 
1863 
48-3 
56-7 
66-4 
40-6 
53-8 
40-8 
32-7 
48-1 
22-0 
39-9 
37-7 
41-2 
1864 
57'7 
47-1 
66-3 
35-8 
40-6 
57"8 
54-7 
54'8 
28-5 
33-9 
57-6 
28-6 
1865 
48-7 
393 
39-5 
29-4 
34-5 
33-6 
26-8 
37-8 
21-6 
17-1 
24-6 
12-8 
1866 
31-6 
38-4 
24-6 
17-6 
12-9 
16-5 
9-3 
12-7 
7-3 
14-1 
9-0 
1*5 
1867 
o-o 
0-7 
9-2 
5-1 
2-9 
1-5 
5-0 
49 
9-8 
13-5 
9-3 
25-2 
1868 
15-6 
15-8 
26'5 
36-6 
26-7 
31-1 
28-6 
34-4 
43-8 
61-7 
59-1 
67-6 
1869 
60-9 
59-3 
52-7 
41-0 
104-0 
108-4 
59-2 
79-6 
80-6 
59-4 
77-4 
104-3 
1870 
77-3 
114-9 
159-4 
160-0 
176-0 
135-6 
132-4 
153-8 
136-0 
146-4 
147-5 
130-0 
1871 
88-3 
125-3 
143-2 
162-4 
145-5 
91-7 
103-0 
110-0 
80-3 
89-0 
105-4 
90-3 
1872 
79*5 
120-1 
88-4 
102-1 
107-6 
109-9 
105-2 
929 
114-6 
103-5 
112-0 
83-9 
1873 
86-7 
107-0 
98-3 
76-2 
47-9 
44-8 
66-9 
68-2 
47-5 
47-4 
55"4 
49-2 
1874 
60-8 
64-2 
46-4 
32-0 
44-6 
38-2 
67-8 
61-3 
28-0 
34-3 
28-9 
29-3 
1875 
14 6 
22-2 
33-8 
29-1 
11-5 
23-9 
12-5 
14-6 
2-4 
12-7 
17-7 
9-9 
1876 
14-3 
15-0 
31-2 
2-3 
5-1 
1-6 
15 2 
8-8 
9-9 
14-3 
9-9 
8-2 
1877 
24-4 
8-7 
11-7 
15-8 
21-2 
13-4 
5-9 
6-3 
16-4 
6*7 
14-5 
2-3 
j Means. 
50-1 
53-8 
55-4 
50-7 
531 
51 "5 
48-0 
53-2 
52-0 
53-6 
51-9 
51-4 
