in relation to the Solar Spots. 443 
Passing now to the other territorial groups, the results from 
which are to be regarded as only rough approximations toward 
the truth on account of the insufficiency of the stations, we 
obtain the following results from all these taken together. In 
the years when the extent of the spots is in excess, the annual 
rainfall is above the mean thirty-five times, below it thirty- 
seven times, and equal to it five times. In the years when the 
sun-spot area is below the mean the rainfall is below the aver- 
age thirty-two times, above it twenty times, and equal to it six 
s. 
Taking now all the groups which embrace so large a portion 
of the United States, we obtain the following results in refer- 
ence to the subject before us: 
Ratio of the excess of 
Sun-spot area. rainfall (above the 
mean) in deficiency. 
From 1804 to 1805 (inclusive),*| above the mean, ip 
* 1806 to 1815 Holow oS ace 6:4 
“ 1816 to 1817 above “* * 0:2 
“ 1818 to 1826 Doe. 7. 6. .12 
ABZ? ta. 1881 shove". © 2-4 
*" 1832 to 1834 below. %.7 © es 
“ 1835 to 1840 above °° 6: 29 
“1841 to 1845 noe. 12:19 
“ 1846 to 1852 above * 8 Sr. to 
“1853 to 1857 woe > * 8:28 
“1858 to 1864 ine =o" * $1: 15 
“1865 to 1867 Below 15:3 
For the reasons already stated, namely, that groups I, IT and 
IV. are only to be regarded as trustworthy, and that the rest 
give but rough approximations, the above results must be 
taken with great allowance. As they stand they are full of 
anomalies, about half the results favoring and the rest contra- 
dicting the law which is supposed to exist between the rainfall 
and the extent of the sun-spot area. : 
The results obtained by this first method of comparison are 
exhibited in the annexed table. (TableI) _ : 
he second mode of investigating any relation which may 
exist between the annual fluctuations in the extent of the solar 
spots and the variations in the yearly rainfall, consists In form- 
* In 1804 the rainfall equals the mean also. 
