ON THE PERIODICITY OF THE AURORA BOREALIS. 



299 



Christiania. Fearnley. 



Haparanda. Ballot. Heis. 



Eichiill, Insel Oesel. 1 Ballot. 



Eichiill, Insel Oesel. Ballot. 



St. Petersburg, Greenwich. Ballot. Heis, 



Minister. Ballot. Heis. 



Insel Oesel. Sass. Heis. Ballot. 



Insel Oesel. Sass. Heis. Ballot. 



Peckeloh, Munster. Ballot. Heis. 



Aalesund. Fearnley. 



Hernosand. Ballot. Heis. 



Cork, Ireland. Stevelly. 



Lichtenberg, Naugard. Heis. 



Insel Oesel. Sass. Heis. Berlin f Ballot. 



Aalesund. Fearnley. 



Cambridge. Lovering. Toronto. Kingston. 



Montreal. Smallwood. 



Skudesnes, Christiania. Fearnley. 



Cambridge. Lovering. Toronto. Kingston. 



Hernosand, Lichtenberg. Ballot. Heis. 



Insel Oesel. Sass. Peckeloh. Ballot. Heis. 



Aalesund. Fearnley. Skudesnes. 



Christiania. Fearnley. 



Toronto. Kingston. 



Lichtenberg. Ballot. Heis. 



Hernosand, Berlin. Ballot. 



Christiania. Fearnley. 



Insel Oesel. Sass. Heis. 



Toronto. Kingston. 



Lichtenberg. Ballot. Heis. 



Hernosand. Ballot. Heis. 



Lichtenberg. Heis. Berlin. Ballot. 



Gorcy bei Metz. Ballot. Heis. 



Toronto. Kingston. 



Christiania. Fearnley. 



Hernosand. Ballot. Heis. 



Stockholm, St. Petersburg. Heis. 



Christiania. Fearnley. 



Peckeloh, Bamberg. Ballot. Heis. 



Lichtenberg. Ballot. Heis. 



Toronto. Kingston. 



Peckeloh. Ballot. Naugard. Heis. 



Lichtenberg, Munster. Ballot. Heis. 



Netherlands, Stockholm. Ballot. 



Skudesnes, Christiania. Fearnley. 



Lichtenberg. Ballot. Heis. 



Hernosand. Heis. Bamberg. Ballot. 



Lichtenberg, Bamberg. Ballot. Heis. 



1 The auroras of Feb. 4 and 5 are probably the same as those 

 of Feb. 16 and 17 expressed in old style. Same as Eukull. 



March 23. Lichtenberg. Ballot. Heis. 

 " 25. Christiania. Fearnley. 



Hernosand, Haparanda. Ballot. Heis . 



Stockholm. Ballot. 



Christiania. Fearnley. 



Cambridge. Lovering. 



St. Petersburg. Ballot. Heis. 



Stockholm, Haparanda. Ballot. Heis. 



Christiania. Fearnley. 



Toronto. Kingston, 



Christiania. Fearnley. 

 April 13. Christiania. Fearnley. 



Christiania. Fearnley. 



Toronto. Kingston. 



Toronto. Kingston. 



Peckeloh, Munster. Ballot. Heis. 



Christiania. Fearnley. 



Toronto. Kingston. 



Toronto. Kingston. 

 19. Stockholm. Ballot. Heis. 

 13. Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Athens. Schmidt. Heis. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



Toronto. Kingston. 



12. Cambridge. Lovering. 



13. Toronto. Kingston. Cambridge. Lovering. 



14. Toronto. Kingston. 

 Toronto. Kingston. 

 Toronto. Kingston. 



Toronto. Kingston. Peckeloh. Ballot. Heis. 

 North Conway, N. H. Lovering. 

 Toronto. Kingston. 



Aug. 2. North Conway, N. H. Lovering. 



Toronto. Kingston. NewHaven. A.C.T. 1 

 Munster, Peckeloh. Ballot. Heis. 

 Magdeburg. Ballot. Heis. 

 Christiania. Fearnley. 

 Toronto. Kingston. , 



North Conway, N. H. Lovering. 

 Toronto. Kingston. Stockholm. Ballot, 

 1 Amer. Journ. Sci., Second Series, XL. 285. 



May 



June 



July 



21. 

 27. 

 27. 

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 29. 

 29. 

 29. 

 30. 

 30. 

 13. 

 14. 

 15. 

 16. 

 16. 

 16. 

 17. 

 18. 



16. 

 19. 

 25. 

 26. 

 10. 

 15. 

 16. 

 17. 

 20. 

 21. 

 23. 

 7. 



17. 

 IS. 

 19. 

 22. 

 22. 



2. 



2. 



2. 



2. 



3. 



4. 



4. 

 12. 



