170 =F. Loomis on Solar Spots, Magnetic Declination, ete. 
Spotted surface of the Sun near the time of an Auroral display. 
Days before the Aurora. Days after the Aurora. 
5 3 ‘Aurora!; 1 3 4 5 
1850. Jan. 18, 20 || 20 
Feb. 3, 113 
Feb. 22, 115 || 54 
March 3, 97 || 45 
March 10, 98 || 89 
March 31, 39 |) 27 
April 7, 2) 2 
May 7, 80 || 4 
July 12, 76 |) 3 
Aug. 9, 0 
Sept. 4, 107 || 8 
Sept. 10, 106 || 74 
Sept. 30 5 || 36 
ct. 2 55 AC 
Oct. 27, & 
Dec. 26, 58 || 48 
1851. Feb. 18, 78 || 101 
March 22, 81 
March 29, 35 || 53 
une 5, 51 || 44 
June 27, 61 
July 17 30 || 33 
Sept. 4, 103 || 66 
pt. 7, 45 It 69 
Sept. 10, 52 
ct. 1, 14 14 
t. 20, 54 || 13€ 
Oct. 23, 94 
Oct. 28, 50 || 54 
1852. Jan. 19, 127 || 10 
Feb. 16, pate 
Feb. 20, 101 || 10 
March 7, 40 5 
April 114 || 90 
April 15, 64 || 34 
April 22 2s || 1 
May 17, 37 || 1 
June 5, 57 || 6€ 
June 11 || 3¢ 3¢ 
June 16, 30 || 24 4 
July 6, 65 || 7 3 
July 10, 61 || 34 2 
pt. 6, 35 || 6] 2! 
Sept. 17, 15 |j 2: 4 
Sept. 21, 2 | 4 
Sept. 29, 36 || 2¢ 4 
Oct. 5, THB 2 
Oct. 20, 89 || 105 
Nov. 11, 73 1 
Dec. 5, 58 4§ Z 
Dec. 13, 28 4 
1853. Feb 14, é pé 
March 14, 24 || : 6 
March 27, 63 || i 
April 6, uae 4 
May 2, 7 lL 
June l, S811 -5 50) 
52 || € 47) 
July 12, 48 || 9 4s 
Mean of days obs. [48-9|49-sla7-alao-cloas ore 56°3 ||53-2|4 
Mean of 951 days obs,/50-3159-7151-0 51°2'53-1 60-5 log'596 
