dy
is seen. Counselor Schwabe, of Dessau, has made them his study since 1826,
and has arrived at some singular results. They seem to be numerous--in
groups--and to appear periodically with minima and maxima of ten years.
As the result of his observations, from 1826 to 1850, he gives us the
following table and remarks:

+-----------------------------------------------+
| Year. | Groups. | Days showing | Days of |
| | | no spots. | Observation. |
|-------|---------|--------------|--------------|
| 1826 | 118 | 22 | 277 |
| 1827 | 161 | 2 | 273 |
| 1828 | 225 | 0 | 282 |
| 1829 | 199 | 0 | 244 |
| 1830 | 190 | 1 | 217 |
| 1831 | 149 | 3 | 239 |
| 1832 | 84 | 49 | 270 |
| 1833 | 33 | 139 | 267 |
| 1834 | 51 | 120 | 273 |
| 1835 | 173 | 18 | 244 |
| 1836 | 272 | 0 | 200 |
| 1837 | 333 | 0 | 168 |
| 1838 | 282 | 0 | 202 |
| 1839 | 162 | 0 | 205 |
| 1840 | 152 | 3 | 263 |
| 1841 | 102 | 15 | 283 |
| 1842 | 68 | 64 | 307 |
| 1843 | 34 | 149 | 312 |
| 1844 | 52 | 111 | 321 |
| 1845 | 114 | 29 | 332 |
| 1846 | 157 | 1 | 314 |
| 1847 | 257 | 0 | 276 |
| 1848 | 330 | 0 | 278 |
| 1849 | 238 | 0 | 285 |
| 1850 | 186 | 2 | 308 |
+-----------------------------------------------+

"I observed large spots, visible to the naked eye, in almost all the
years not characterized by the minimum; the largest appeared in 1828,
1829, 1831, 1836, 1837, 1838, 1839, 1847, 1848. I regard all spots,
whose diameter exceeds 50", as large, and it is only when of such a
size that they begin to be visible to even the keenest unaided sight.

"The spots are, undoubtedly, closely connected with the formation of
faculae, for I have often observe