ON THE PERIODICITY OF THE AURORA BOREALIS. 



339 



AURORAS OBSERVED IN DIFFERENT YEARS, ARRANGED ACCORDING TO LOCALITY. Continued. 



41 



27 

 38 

 22 

 30 



29 

 7 



12 

 5 

 9 



62 

 29 

 28 

 19 

 40 



33 

 26 

 30 

 18 

 15 



52 

 45 

 44 



28 

 60 



48 

 52 

 51 

 20 



5 



7 

 5 



13 



1 

 4 



4 

 3 



16 



11 



3 



1 



3 

 3 



gg. 



■gCB 



w 



h-1 



21 



25 



25 

 57 



a 

 60 

 93 

 84 

 87 

 74 

 32 



27 



15* 

 50 



*1 



O =3 



21 



7 



33 



125 



41 



10 



17 



8 

 54 



12 6 

 22 



10 

 15 

 15 

 18 

 12 

 24 

 21 

 17 

 14 

 11 

 21 

 7 



30 



86 



pa 



63 

 56 

 37 

 38 



w 

 .a 



Pn 



15 

 1 



22 



22 



42 



106 



75 



U a, 



5 

 41 



8 



47 



a 



16 

 11 



23 

 16 



7 ! 

 21 

 24 



20.0 



35.0 



45.5 



43.5 



34.1 



22.5 



8.9 



4.3 



2.9 



1.3 



0.7 



17.4 



29.4 



39.9 



52.5 



53.5 



59.1 



38.8 



22.5 



7.5 



11.4 



45.5 



96.7 



111.0 



82.6 



68.5 



51.8 



29.7 



19.5 



8.6 



13.0 



33.0 



47.0 



79.4 



100.4 



95.6 



64.5 



61.9 



52.2 



37.7 



19.2 



6.9 



4.2 



21.6 



50.9 



96.4 



98.6 



77.4 



59.4 



44.4 



47.1 



Max. 



Min. 



Max. 

 Min. 



Min. 



Max. 



Min. 



Max. 



1 Lake Superior. 

 ' Fort Norman. 



8 In Lat. 75°. 

 4 Port Kennedy. 



6 Port Bowen. 

 * Behring Sea. 



' Northumberland Sound. 

 * Lancaster Sound, etc. 



