ON THE FERIODICITY OF THE AURORA BOREALIS. 



335 



AURORAS OBSERVED IX DIFFEREXT YEARS, ARRAXGED ACCORDING TO LOCALITY. Continued. 



31 

 37 

 19 

 29 

 30 

 17 



7 



14 

 40 

 10 

 10 

 15 



4 



2 

 2 

 2 

 2 

 1 

 1 



18 



12 

 24 

 27 



7 

 36 

 20 

 19 

 22 

 10 

 13 



7 



1 



4 



25 

 25 

 20 



14 



1 



G 



24 



15 



19 



21 



3 



3 



1 



2 



1 



16 

 4 



13 

 21 



23 

 4 

 13 

 34 

 27 

 26 

 21 



41 



33 



23 



37 



11 



11 



6 



6 



1 



2 



1 

 4 

 4 

 3 

 2 



3 

 1 



19 

 20 

 14 



- 



E 



12 



26 



28 



3 

 2 

 1 



3 

 8 

 4 

 1 

 1 



2 



177s 

 1779 

 1 780 

 1781 



1 782 



1 783 

 1784 

 1785 

 1786 

 1787 

 1788 

 1789 

 1790 

 1791 

 1792 

 1793 

 1794 

 1795 

 1796 

 1797 

 1798 

 1799 

 1800 

 1801 

 1802 

 1803 

 1804 

 1805 

 1806 

 1807 



1S..S 



1809 

 1810 

 1811 

 1812 

 1813 

 1814 

 1*15 

 1816 

 1817 

 1818 

 1819 

 1820 

 1821 

 1822 

 1823 

 1824 



94.8 



99.2 

 72.6 

 67.7 

 33.2 

 22.5 

 4.4 

 18.3 

 60.8 

 92.8 

 90.6 

 85.4 

 75.2 

 46.1 

 52.7 

 20.7 

 23.9 

 16.5 

 9.4 

 5.6 

 2.8 

 5.9 

 10.1 

 30.9 

 38.3 

 50.0 

 70.0 

 50.0 

 3O.0 

 10.0 

 2.2 

 0.8 

 0.0 

 0.9 

 5.4 

 13.7 

 20.0 

 35.0 

 45.5 

 43.5 

 34.1 

 22.5 

 8.9 

 4.3 

 2.9 

 1.3 

 6.7 



Max. 



Mi 



Max. 



Min. 



Max. 



Min. 



Max. 



Min. 



For the observations at Arkhangel, see p. 337. 



