156 E. Loomis on Solar Spots, Magnetic Declination, ete. 
Table of Relative Number of Solar Spots Each Year. 
Number Nu _— T Number |Number Number 
Year. of Year, Year.| of Year. | | of Year. oft 
Spots. Sp oe | | Spots. Spots. Spots. 
1740; 60°0 7}|1766| 17°75 1792| 52°17? 1818! 341* ||/1844| 13°0* 
1741| 35-0 ?||/1767| 33°6 1793. 340 71])1819| 22°5*||1845/ 33:0* 
1742] 18°3 1768] 52°2 ||1794| 50-0 1820; 8-9*||1846| 47°0* 
1743] 14°6 1769| 85 7¥*||1795| 35.0 1821 | 4°3*||184 4% 
1744 21770) T9-4*|) 1796); 9:4 1}1822) 2°9*||1848/100-4* 
1745| 100 7/| 1771) 73°2* 97 | 5°6* 1|1823/ 1 849 6* 
1746] 20°07||1772| 49 : | 2°8* 11182 6°7 ||1850| 64°5* 
L747) 35°0 71) 17731 39° 1799, 5. 4 1825| 1 1851} 61-9* 
1748| 50-0 2)|/1774 et 1800 
01. 
1749| 63°8* ||1775 | 27°5 11801, 22:1? 
1750} 68°2* ||1776| 35-2 ||1802, 27-4 7//1828) 52°5 ||1854| 19-2* 
1751} 40°9* |/177 0 {1803 35-7 7//1829, 53-5*|/1855) 6-9* 
1752| 33-2* ||1778| 94-8 |/1804) 50-0 7//1830) 59-1*|| 1856 = 
1753] 23-1 |}1779] 902 | 35-7 2111831) 38-8*!11857| 21 6* 
1754| 13°8* ||1780| 72 1806} 21:4 ?||1832; 22°5* ||1858| 50-9* 
1755| 6°O* ||1781| 67-7 ||1807| 7:1.7|/1833|} 7°5* ||1859| 96°4* 
1756 1782} 33°2 |/18 | 2-2 34} 11:4* |/1860| 98°6* 
1757} 30°4* |/1783] 22°5 |/1809| 0-8 ||1835) 45.5* {/1861| 77°4* 
1758| 3 1784 1810, 0-0* |/1836| 96-7 ||1862| 59-4 
1759| 48°6 |/1785|] 18-3 |/1 0°9* ||1837 1863} 44°4* 
1760) 48°9* || 1786] 60°8*|/18 4* |'18 
+ ‘4 35°0 i 
1764] 84°5* ||1790} 75-2 1816) 45°5* ||1842|) 19°5* || 1868| 40°2* 
1765| 23-0* ||1791! 46.1 ||1817| 43°5* ||1843| 8-6*|]18691 84-1* 
urve line at the bottom of the accompan ying Plate, 
shows the 5 ideal aa in this series of numbers, and exhibits a 
succession of maxima and minima which occur at the following 
dates : 
Maxima. Minima. 
Year, Interval. | Year. i0 Interval. ai Interval. | Year, Interval. 
; years. : 11°65 years. 
1750 41 years, | 1804 ja57 «|i ar55-5 1 Syears.| 1810 34° Tu 
1761 a | (8166 2 105 = | 1823 “ 
8 13°5 1166 10 
1769 “a 0 qT it 1775 9 = 1833 10 “ 
1778 9 “ 1837 ll 6 1784 9 = 1843 13 te 
on 1848 gw [Igy = 4 18865; s 
age interval pe nor vi Dr. Walt overlooks the maxi- 
mum of 1794 and counts but sea riod from 1787 to 1804. 
This interval amounts to 17 which is the same as the in- 
terval from the maximum o 1761 43 that of 1778 (including 
two periods) ; and the interval from the maximum of 1830 to 
that of 1848 (including also two periods) = only 18 years. 
therefore, we should count 1794 as a year of maximum. 
equal in amount to the following se of 1804 and 1816, 
