110 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



May 5. St. Petersburg. Kupffer. Muncke. 1 



" 5. Arago and Quetelet. 



" 5. St. Petersburg. Kupffer. 2 



" 6. Wilmington. Gibbon. 



" 9. New York. Hough. 



" 10. New York. Hough. 



" 11. New York. Hough. 



" 13. New York. Hough. 



" 14. New York. Hough. Wilmington. Gibbon. 



" 15. New York. Hough. Wilmington. G.bbon. 



" 19. New York. Hough. 



" 22. New York. Hough. 



June 9. New York. Hough. 



" 10. Boston. Hale. Lovering. 



" 10. Wilmington. Gibbon. 



" 11. Boston. Hale. Lovering. 



" 11. New York. Hough. Wilmington. Gibbon. 



" 16. New York. Hough. 



" 17. New York. Hough. 



" 18. New York. Hough. 



" 29. New York. Hough. 



July 7. New York. Hough. 



'• 14. New York. Hough. Wilmington. Gibbon. 



" 14. Fayetteville, Vermont. Hough. 



" 15. New York. Hough. 



" 21. New York. Hough. 



" 28. New York. Hough. 



Aug. 8. New York. Hough. 



" 10. New York. Hough. 



" 11. New York. Hough. 



" 12. New York. Hough. 



" 13. New York. Hough. 



" 15. Wilmington. Gibbon. 



" 19. New York. Hough. 



" 20. Wilmington. Gibbon. Gosport. Burney. 8 



" 20. G. Britain or Ireland. Dalton. 



" 20. Arago, Muncke, and Quetelet. 



" 21. New York. Hough. 



" 25. New York. Hough. 



" 26. New York. Hough. 



« 28. New York. Hough. 



" 29. New York. Hough. 



Sept. 5. New York. Hough. 



" 7. New York. Hough. 



" 7. G. Britain or Ireland. Dalton. 



" 7. Bedford. White. Gosport. Burney. 



i Mem. de l'Acad. St. Petersb. N. S. I. 



2 Pogg. Ann. XVIII. 611. 



8 PhU. Mag. Second Series, VIII. 316. 



jPept. 7. 



8. 



8. 



9. 

 10. 

 10. 



11. 



12. 

 12. 

 13. 

 13. 

 13. 

 15. 

 16. 

 17. 

 17. 

 17. 

 17. 

 18. 

 19. 

 19. 

 20. 

 21. 

 23. 

 24. 

 25. 

 5. 



u 

 Oct. 



5. 



5. 



5. 



5. 



6. 



6. 



7. 



8. 



9. 



9. 

 10. 

 11. 

 13. 

 14. 

 15. 

 15. 

 16. 

 16. 

 16. 



Dalton. Arago. 



Dalton. Arago. 



Arago, Muncke, and Quetelet. 



G. Britain or Ireland^ Dalton. Quetelet. 



Bedford. White. Gosport. Burney. 1 



New York. Hough. 



Neio York. Hough. 



G. Britain or Ireland. 



New York. Hough. 



G. Britain or Ireland. 



Wilmington. Gibbon. 



G. Britain or Ireland. Dalton. 



St. Petersburg. Kupffer. 



Arago, Muncke, and Quetelet. 



New York. Hough. Wilmington. Gibbon. 



New York. Hough. Wilmington. Gibbon. 



New York. Hough. Wilmington. Gibbon. 



Bedford. White. Gosport. Burney. 



G. Britain or Ireland. Dalton. Muncke. 



St. Petersburg. Wisniewsky. Kupffer. Arago. 



St. Petersburg. WisnieW9ky. Kupffer. 



G. Britain or Ireland. Dalton. 



St. Petersburg. Wisniewsky. Kupffer. Arago. 



G. Britain or Ireland. Dalton. Ara<ro. 



G. Britain or Ireland. Dalton. Arago. 



St. Petersburg. Kupffer. 



Scotland. Arago. 



G. Britain or Ireland. Dalton. Arago. 



New York. Hough. 



G. Britain or Ireland. Dalton. 



Arago, Muncke, and Quetelet. 



Bedford. White. Gosport. Burney. 



Kendal. Hough. 



New York. Hough. 



At Sea. Lat. 44°. Long. 52°. Acosta. Arago. 



New York. Hough. 



New York. Hough. 



New Ycrk. Hough. 



Cambridge, England. 



New York. Hough. 



New York 



New York 



New York. 



New York 



Wilmington. 

 Hough. 



Gibbon. 



Hough. 



Hough. 



Hough. 



Hough. 

 S/ielland Islands. Hough 2 . 

 New York. Hough. 

 G. Britain or Ireland. Dalton. 

 Arago, Muncke, and Quetelet. 



1 Phil. Mag. IX. 393. 



2 Results of a series of Meter. Observ. &c., 

 New York, &c, p. 474. 



in the State of 



