with the extent of the Spots on the Sun. — 247 
ferent mode of computation he might reduce this number to 
169°1, and these are the values which he published in the 
Vierteljahrsschrift, vol. xvi, pp. 84-85. But it would’ seem as 
if he subsequently became alarmed at the discrepancy between 
these numbers and the range of the magnetic needle as reported 
from the observatories of Munich and Prague, and in the Vier- 
teljabrsschrift, vol. xvii, pp. 2-6, he undertakes a new discussion 
these observations and reduces the relative number for 1870 
to 139°6. If, when his materials were so abundant as in 1870, 
for in a few 
Table of relative extent of solar spots each year. 
} 
Year. Extent {lyon —— ll ear. ee t | Year. — Year. _—— Year.' ene ma 
spots. spots. spots. spots. spots. | 
176 
1776; 35-2 |l1799| 47-5 |\l1808| 7-2 6-7 518 [l1966, 4:2 
1777) 63-0 |l1793| 40-9 yim 3-4 17-4 ||1841; 29°7 |l1857| 21°6 
1778) 94-8 |l1794| 34-3 |l1810| 0-0 29°4 ||1842| 19°5 ||1868| 50-9 
seh 90-2 |11795| 22-3 |11811} 1°2 39-9 | 8°6 [11859] 96-4 
1780) 72-6 ||1796| 15-1 (11812)  5°4 52° 13-0 ||1860| 98°6 
1781) 67-7 |l1797| 7-8 ||1813) 13-7 535 33-0 ||1861| 77-4 
1782). 33-2 |l1798| 4-4 |l114| 20-0 59° 47-0 ||1862| 59-4 
1783) 22-5 ||1799| 10-2 ||1815| 35°0 38°8 79-4 ||1863| 44:4 
1784; 5-0 |!1800| 18:5 ||1816| 45°5 22°5 100-4 |/1864, 47-1 
1785} 21-2 |l1801| 38-6 |l1gi7| 43-5 1 95°6 [11865 32°5 
1786) 68-6 |!1802| 57-8 ||1818 114 5 |l1866| 17°5 
1787) 104-8 ||1803| 65-0 ||1g19| 22°5 45°5 61-9 ||1867 0 
1788) 107-8 |/1804| 75-0 ||1820| 8-9 96 52-2 (11868 2 
1789) 110-7 |/1805| 50-0 |/1821| 4° 111°0 37-7 ||1869) 84 
1790; 84-4 |/1g06| 25-0 {1822 29 82 19-2 ||1870| 139°6 
‘ 18 : 
1791| 53-4 ||1807| 15-0 ||1823| 1-3 ||1839| 68° 6-9 |j1871| 109°6 
[BR reraraacne ea A, the NCA tt. esa | 
