188 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



XXVII. AURORAS OBSERVED AT UPSAL, SWEDEN, ARRANGED BY YEARS AND MONTHS. 



Ye:ir 



1716 



17 is 

 1720 

 1723 

 1724 

 171'.-. 

 1726 

 1727 

 172S 

 172'.) 

 17;;" 

 1731 

 1732 

 1736 

 1737 

 1739 

 1740 

 1741 

 1742 

 1743 

 1744 

 1745 

 1746 

 1747 

 17 is 

 1749 

 1750 

 1751 

 1752 

 1753 

 1754 

 1755 

 1756 

 1759 

 1760 

 1761 

 1762 



Total 



.1:111 



4 

 2 



10 



4 

 1 

 3 

 6 

 1 

 2 

 1 

 3 

 5 

 6 

 2 



1 

 1 



2 



7 

 5 

 5 

 3 

 6 



1 

 2 

 5 

 7 

 7 

 5 

 2 

 7 



10 

 1 

 4 

 4 

 5 



5 

 3 

 2 

 2 

 2 

 6 

 9 

 11 



85 i 131 



Mar. 



1 



2 

 3 

 5 

 3 

 5 

 11 



9 

 7 

 7 

 3 



5 



8 



8 



10 



6 



1 



11 



10 



5 



1 

 4 

 5 

 4 



1 



Apr. 



I 



2 

 6 



1 



1 

 3 



4 

 2 



1 



8 

 2 



2 

 2 



7 

 8 



May June 



152 75 



July 



Aug 



1 



a 

 3 



11 

 7 

 5 



1 



u 



4 

 1 

 5 



Sept. 



3 



3 



15 

 4 



8 

 4 

 9 



8 

 6 

 2 

 2 

 6 

 4 

 7 

 3 

 2 

 3 

 2 

 5 

 1 

 1 



(5 

 11 



Oct. 



2 



1 



1 

 1 



4 



3 



10 



6 

 3 



7 



7 



6 



16 



10 



8 



1 



1 



14 



4 



3 



5 



2 



5 



6 



2 



3 

 3 

 2 

 8 

 2 



72 



126 



146 



2 



1 

 1 



2 

 6 

 10 

 5 

 1 



7 

 3 

 7 

 2 

 4 

 1 

 2 

 3 

 4 

 6 

 2 



2 

 4 

 4 

 1 

 3 

 2 



9 



7 

 4 

 4 



109 



1 

 3 

 2 

 1 

 3 



6 

 4 

 2 



1 

 3 

 10 

 2 

 3 

 2 

 5 

 4 

 2 

 6 

 3 

 1 

 8 

 4 

 5 

 1 

 1 



12 

 4 



1 

 7 



Dotal 



1 



9 



1 



1 



4 



5 



7 



8 



27 



31 



52 



36 



42 



14 



5 



45 



37 



83 



46 



47 



15 



20 



49 



36 



40 



32 



27 



22 



40 



34 



17 



9 



15 

 51 

 50 

 48 

 12 



109 11018 



XXVIII. AURORAS OBSERVED AT TORONTO, CANADA, ARRANGED BY YEARS AND MONTHS. 



Year 



1848 



1849 

 1850 

 1851 



Total 



Aug. 



Sept. 



6 

 8 

 4 

 7 



25 



7 

 12 



5 

 _9_ 



"33" 



389 



