96 
PROFESSOR A. SCHUSTER ON THE PERIODICITIES OF SUNSPOTS. 
observations are available. But the existing material has not yet been exhausted, 
and may be expected to give further results, which I hope to present to the Society 
in due course. 
Table I.—Comparison of Areas and Wolf’s Sunspot Numbers. 
Year. 
Mean daily 
area for 
each year. 
Wolf’s 
sunspot 
numbers. 
Ratio. 
Year. 
Mean daily 
area for 
each year. 
Wolf’s 
sunspot 
numbers. 
Ratio. 
1832 
274 
27-5 
9-96 
1867 
131 
7-3 
17-95 
1833 
60 
8-5 
7-06 
1868 
434 
37-3 
11-63 
1834 
133 
13-2 
10-08 
1869 
972 
73-9 
13-15 
1835 
773 
56-9 
13-58 
1870 
2761 
139-1 
19-36 
1836 
1331 
121-5 
10-96 
1871 
2004 
111-2 
18-02 
1837 
1170 
138-3 
8-46 
1872 
1462 
101-7 
14-38 
1838 
903 
103-2 
8-75 
1873 
766 
66*3 
11-55 
1839 
780 
85-8 
9-09 
1874 
601 
44-7 
13-45 
1840 
586 
63-2 
9-27 
1875 
272 
17-1 
15-91 
1841 
348 
36-8 
9-46 
1876 
122 
11-3 
10-80 
1842 
254 
24-2 
10-50 
1877 
92 
12-3 
7-48 
1843 
95 
10-7 
8-88 
1878 
19 
3-4 
5-59 
1844 
171 
15-0 
11-40 
1879 
30 
6-0 
5-00 
1845 
419 
40 1 
10-45 
1880 
402 
32-3 
12-45 
1846 
626 
61-5 
10-18 
1881 
679 
54-3 
12-50 
1847 
1021 
98-5 
10-36 
1882 
1002 
59-7 
16-78 
1848 
986 
124-3 
7-93 
1883 
1155 
63-7 
18-13 
1849 
765 
95-9 
7-98 
1884 
1079 
63-5 
16-99 
1850 
494 
66-5 
7-43 
1885 
811 
52-2 
15-53 
1851 
683 
64-5 
10-59 
1886 
381 
25-4 
15-00 
1852 
545 
54-2 
10-06 
1887 
179 
13-1 
13-67 
1853 
436 
39-0 
11-18 
1888 
89 
6-8 
13-09 
1854 
113 
20-6 
5-49 
1889 
78 
6-3 
12-38 
1855 
64 
6-7 
9-55 
1890 
99 
7-1 
13-94 
1856 
49 
4-3 
11-40 
1891 
569 
35-6 
15-99 
1857 
201 
22-8 
8-82 
1892 
1214 
73-0 
16-63 
1858 
714 
54-8 
13-03 
1893 
1464 
84-9 
17-25 
1859 
1404 
93-8 
14-96 
1894 
1282 
78-0 
16-44 
1860 
1172 
95-7 
12-25 
1895 
974 
64-0 
15-22 
1861 
1258 
77-2 
16-29 
1896 
543 
41-8 
12-99 
1862 
1363 
59-1 
23-06 
1897 
514 
26-2 
19-62 
1863 
702 
44-0 
15-95 
1898 
375 
26-7 
14-05 
1864 
784 
47-0 
16-68 
1899 
111 
12-1 
9-17 
1865 
407 
30-5 
13-35 
1900 
75 
9-5 
7-90 
1866 
318 
16-3 
19-51 
1901 
29 
2-7 
10-74 
