Memoirs presented to the Cambridge philosophical society on the occasion of the jubilee of Sir George Gabriel Stokes, bart., Hon. LL. D., Hon. SC. D., Lucasian professor.

120 MR SCHUSTER, THE PERIODOGRAM OF MAGNETIC DECLINATION
TABLE VIII.
Period of 26 Days Period of 27 Days Period of 26 Days Period of 27 Days
Year
<12, <)2 S1 1) r r2
1869 73~ 155~ 354~ 318~ 3-25 1 87 1'92 i -96
1870 271 354 56 280 1-04 1 21 3-72 2 08
1871 293 275 141 51 1 41 2-13 4-28 1-09
1872 257 201 297 303 371 2-19 478 1'12
1873 253 263 289 268 3-48 0-75 1'99 2-54
1874 250 349 280 143 2-91 0-75 2-25 1'03
1875 261 193 135 70 1'90 0-53 66 0-86
1876 135 43 84 338 200 1-58 2-30 0-69
1877 253 158 226 271 1-14 1-53 -82 074
1878 30 133 78 115 1-33 0-57 2'29 0-14
1879 51 89 151 251 2-38 0-76 1 44 0-13
1880 7 344 317 298 1'18 0-55 2-39 0-89
1881 238 55 110 346 1 57 1-23 1 50 1'90
1882 283 294 261 133 2-66 1-71 3-59 125
1883 67 356 267 31 1 58 1-71 148 1 69
1884 163 177 221 267 184 0-66 2'09 1-27
1885 87 110 238 245 0-56 1-58 1-09 0-72
1886 185 290 198 297 1-79 1-36 293 1-18
1887 31 233 126 54 2 04 2-15 217 0-41
1888 290 134 258 45 1-40 1-51 1-32 0-06
1889 51 288 161 342 1.44 1-64 1-13 1-53
1890 287 359 272 49 1-34 0-49 1-18 1-03
1891 208 206 266 153 0-85 0'30 256 0-84
1892 64 249 350 350 0'89 1-13 2-28 | 1'09
1893 233 211 310 65 3'02 3'09 3'83 1 75