112 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Burney. 1 



Dalton. 

 Gosport. 

 Dalton. 



Wilmington. Gibbon. 



Dalton. 



Sharon. Smith. Loomis. 



New York. Hough. 



Sheriff's Harbor. Ross. 



Sheriff's Harbor. Ross. 



G. Britain or Ireland. Dalton. 



New York. Hough. 



G. Britain or Ireland. Dalton. 



G. Britain or Ireland. Dalton. 



New York. Hough. 



Sheriff's Harbor. Ross. 



New York. Hough. 



Sheriff's Harbor. Ross. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



G. Britain or Ireland, 



New York. Hough. 



G. Britain or Ireland. 



New York. Hough. 



Gosport. Burney. 



G. Britain or Ireland. 



St. Petersburg. Wisniewsky. Kupffer. 2 



New York. Hough. 



FayetteviUe, Vermont. Hough. 



Buchhoh. Pastorff. Arago. 



Sheriff's Harbor. Ross. 



New York. Hough. 



New York. Hough. 



G. Britain or Ireland. Dalton. . 



Gosport. Bumey. *SSf. Petersburg. Kupffer. 8 



New York. Hough. 



G. Britain or Ireland. Dalton. 



St. Petersburg. Wisniewsky. Kupffer. 



New York. Hough. 



G. Britain or Ireland. Dalton. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



St. Petersburg. Wisniewsky. Kupffer. 



New York. Hough. 



New York. Hough. 



G. Britain or Ireland. Dalton. 



Paris ? Arago. 



New York. Hough. 



New York. Hough. 



Sharon, Conn. Smith. Loomis. 



i Phil. Ma ? . IX. 



2 Mem. de l'Acad. St Petersb. IV. 



8 Mem. de l'Acad. St. Petersb. III. 



Apr. 19. 



" 19. 



" 19. 



" 19. 



" 20. 



" 20. 



" 20. 



" 23. 



" 30. 

 May 7. 



" 8. 



" 15. 



" 30. 



" 30. 

 June 1. 



" 2. 



" 10. 



" 11. 



" 1G. 



•• 17. 



" 21. 

 July 1. 



" 2. 

 3. 



" 4. 



" 5. 



" 6. 



« 8. 

 9. 



" 10. 



" 12. 



" 30. 



" 31. 

 3. 

 4. 



" 5. 

 6. 



" 19. 

 Sept. 9. 



" 12. 



" 12. 



« 13. 

 Oct. 23. 



" 24. 



" 29. 



Au 



Dalton. 



Wilmington. Gibbon. 



G. Britain or Ireland. Dalton. 

 Gosport. Burney. London. Portsmouth. 

 St. Petersburg. Wisniewsky. Kupffer. 

 Berlin. Kastner. Arago. 1 

 New York. Hough. Wilmington. Gibbon. 

 G. Britain or Ireland. Dalton. 

 Gosport. Burney. Kilzingen. Kastner. 2 

 G. Britain or Ireland. Dalton. 

 New York. Hough. 

 New York. Hough. 

 Wilmington. Gibbon. 

 New York. Hough. 

 G. Britain or Ireland. 

 Gosport. Burney. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 



New York. Hough. Wilmington. Gibbon. 

 New York. Hough. Wilmington. Gibbon. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. 

 Gosport. Burney. 

 New York. Hough. 

 Italy. Fea. Boue. 

 Italy. Fea. Boue. 

 Italy. Fea. Boue. 

 New York. Hough. 

 Albany, N. Y. Henry. 3 

 New York. Hough. 

 G. Britain or Ireland. Dalton. 

 Gosport. White. 



St. Petersburg. Wisniewsky. Kupffer. 

 New York. Hough. 

 New York. Hough. 

 New York. Hough. Wilmington. Gibbon. 



Wilmington. Gibbon. 



Wilmington. Gibbon. 



i Kastn. Archiv. XXI. 85. 



2 Kastn. Archir. XXI. 85. 



» Phil. Mag. X. 78. 



4 Amer. Journ. Sri. XXII. 143 and 155. 



