114 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Oct. 



Sept. 10. 

 " 12. 

 " 13. 

 " 15. 

 « 17. 

 •' 17. 

 " 17. 

 " 17. 

 " 18. 

 " 22. 

 " 23. 

 " 25. 

 4. 

 5. 



12. 



12. 



12. 



13. 



14. 



16. 



27. 



28. 

 2. 

 " 3. 



" 6 ; 

 " 7. 



" 8. 



« 10. 



" 11. 



" 12. 



« 12. 



" 13. 



" 13. 



" 14. 



" 18. 



" 19 



" 20. 



" 21. 



" 23. 



" ar. 



Dec. 3. 



6. 



« 7. 



Nov 



New York. Hough. 



G. Britain or Ireland. Dalton. 



New York. Hough. 



G. Britain or Ireland. Dalton. 



Cambridge. Airy. York. Phillips, &C. 1 



G. Britain or Ireland. Dalton. 



Brussels. Quetelet. 1 



St. Petersburg. Wisniewsky. Kupffer. 



G. Britain or Ireland. Dalton. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



New York. Hough. 



Cambridge. Airy. Armagh. Robinson, &c 8 



G. Britain or Ireland. Dalton. Quetelet. 



.S7. Petersburg. Wisniewsky. Kupffer. 



New York. Hough. Wilmington. Gibbon. 



New York. Hough. 



New York. Hough. 



Great Slare Lake. Hough. 



Great Slave Lake. Hough. 



Fort Reliance. Back and King.' 1 



New York. Hough. Fort Reliance. Back. 



F n-t Reliance. Back and King. 



Back and King. 



Back and King. 



Back and King. 



Back and King. 



Back and King. 

 Quetelet. 

 Loomis. 5 



Fort Reliance. 

 Fori Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Brussels. 

 New Haren. 



Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 

 Cuba. Poey. 6 

 Fort Reliance. 

 Fort Reliance. 

 Fort Reliance. 



Back and King. 

 Back and King. 

 Back and King. 

 Back and King. 

 Back and King. 

 Back and King. 

 Back and King. 



Back and King. 

 Back and King. 

 Back and Kin";. 



1 Proc. Brit. Assoc. II. 4S6. Chart. Edin.'New Phil. Journ. 

 XVI. 36. 



« Annal. de l'Observ. XI. 42. 



8 Proc. Brit. Assoc. II. 4S6. 



4 Narrative of the Arctic Land Expedition, and Hough's Cat. 



6 Amer. Journ. Sci. XXV. 3S4. 



6 Amer. Journ. Sci. N. S. XXVIII. 404. 



l Phil. Trans. 1S39, p. 267. 



