296 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



1863. 



Jan. 8. Christiansund. Holm. 2 



" 10. Christiania. Fearnley. 



" 12. Christiansund. Mohn. 



" 12. Arensburg, Insel Oesel. Heis. Sass. 



" 16. Toronto. Kingston. 



" 18. Christiania. Fearnley. 



" 24. Toronto. Kingston. Bogoslowski. 



" 24. Skudesnes. Fearnley. 



* " 25. Toronto. Kingston. 



1 Nederlaiidsch Meteorologisch Jaarboek, 1863, pp. 302, 319. 



2 Meteorologiske Iagttagelser i det Sydlige Norge, p. 2. 



*Jan. 25. Stockholm, Netherlands. Ballot. Heis. 



" 26. Sandosund. Fearnley. 

 Feb. 6. Skudesnes. Fearnley. 

 " 9. Berlin. Heis. 



" 16. Aalesund. Fearnley. 



" 18. Toronto. Kingston. 



* " 22. Toronto. Kingston. Haparanda. Heis. 



* " 22. Netherlands. Ballot. 



* " 23. Toronto. Kingston. Liidingen. Ballot. 



* " 23. St. Petersburg. Kupffer. 1 



* " 23. Aalesund. Fearnley. Skudesnes. 



* " 23. Haparanda. Ballot. Stockholm. Heis. 

 " 24. Sandosund. Fearnley. 



* " 25. Townto. Kingston. Skudesnes. Fearnley. 

 March 4. Sitka. Kupffer. 



" 12. Toronto. Kingston. 



" 18. Peckeloh. Weber. Heis. 



" 20. Toronto. Kingston. 



* " 21. Mandal. Fearnley. Peckeloh. Weber. 

 " 23. Stockholm. Ballot. Heis. 



* " 24. Stockholm? Heis. 

 " 25. Toronto. Kingston. 



" 26. Christiania. Fearnley. 



" 29. Toronto. Kingston. 



" 30. Toronto. Kingston. 

 April 2. Insel Oesel. Sass. Heis. 

 " 3. Insel Oesel Sass. Heis. 

 " 5. Insel Oesel. Sass. Heis. 

 " 6. Cambridge. Bond. Lovering. 

 " 6. Insel Oesel. Sass. Heis. 

 " 8. Toronto. Kingston. 



* " 9. Toronto. Kingston. Peckeloh. Weber. 

 " 12. Toronto. Kingston. 



* " 15. Haparanda, Stockholm. Ballot. Heis. 



* " 16. Stockholm. Heis. 2 



* " 19. Toronto, Stockholm ? Heis. 



* " 21. Toronto. Kingston. 



" 22. Insel Oesel. Sass. Heis. 

 May 6. Netherlands. Ballot. 



" 9. Cracow. Heis. 

 June 9. Toronto. Kingston. 



" 10. Toronto. Kingston. 



" 13. Toronto. Kingston. 



" 22. Toronto. Kingston. 



" 23. Netherlands. Ballot. 

 July 6. Toronto. Kingston. 



1 Annales de l'Observ. Physique Centrale de Russie, 1863, 

 pp. 32 and 307. 



2 Wochenschrift fur Astronomie etc., Neue Folge, Jahrgang 

 VII. 9. 



