ON THE PERIODICITY OF THE AURORA BOREALIS. 



107 



Nov. 9. 

 9. 



" 11. 



" 13. 



" 18. 



" 18. 



" 18. 



" 19. 



" 19. 



" 19. 



" 22. 

 Dec. 1. 



« 7. 



« 8. 



" 9. 



" 10. 



" 13. 



" 17. 



" 21. 



" 24. 



" 27. 



" 27. 



« 29. 



" 31. 



Jan. 1. 

 3. 



" 4. 



" 1G. 



" 18. 



■ 18. 



" 19. 



" 19. 



" 20. 

 Feb. 3. 



" 12. 



" 17. 



" 19. 

 Apr. 11. 



" 12. 

 June 2. 



« 5. 

 July 5. 



New Haven. Herrick. Loomis. 



Wilmington. Gibbon. 



Finmark. Keilhau. Quetelet and Muncke. 



Finmqrk. Keilhau. Quetelet and Muncke. 



Wilmington. Gibbon. Gosport. Burney. 



G. Britain or Ireland. Dalton. 



Roxburghshire. Arago and Quetelet. 1 



G. Britain or Ireland. Dalton. 



Finmark. Keilhau. Roxburghshire. Muncke 



Arago and Quetelet. 



Quetelet and Muncke 

 Quetelet and Muncke 

 Quetelet and Muncke 



Finmark. 



Finmark. 



Finmark. 



Denmark. 



Finmark. 



Finmark. 



Finmark. 



New York 



Finmark. 



Finmark. 



Kendal. 



Keilhau. 

 Keilhau. 

 Keilhau. 

 Dalton. 



Keilhau. Quetelet and Muncke. 

 Keilhau. Quetelet and Muncke. 

 Quetelet and Muncke. 



Keilhau. 

 Hough. 



Keilhau. 

 Keilhau. 

 Marshall. 



Quetelet and Muncke. 

 Quetelet and Muncke. 

 Muncke. Quetelet.' 2 



Crumpsall. Blackwall. 3 



Finmark. Keilhau. Quetelet and Muncke. 



Finmark. Keilhau. Quetelet and Muncke. 



Aug. 14. 

 " 14. 



" 16. 

 Sept. 8. 



12. 

 15. 

 15. 

 25. 

 26. 

 26. 

 26. 

 27. 

 27. 

 28. 

 29. 

 29. 

 29. 

 29. 

 29. 

 29. 

 30. 

 30. 

 1. 



Oct. 



1828. 



Finmark. Keilhau. 

 Finmark. Keilhau. 

 Finmark. Keilhau. 



Quetelet and Muncke. 

 Quetelet and Muncke. 

 Quetelet and Muncke. 



New Haven 

 New York. 

 Wilmington. 

 New York. 

 New Haven 

 New York. 

 New York. 

 New Haven 

 New York. 



Arago. 



New York. Hough. 

 New York. Hough. 

 G. Britain or Ireland. 



Quetelet. 



New York. Hough. 

 Mont Morillon. Arago 



Loomis. 



Olmsted. 

 Hough. 



Gibbon. Arago. 

 Hough. Arago. 



Herrick. Loomis. 

 Hough. Arago. 

 Hough. Arago. 



Herrick. Loomis. 

 Hough. 



Arago. 

 Arago. 

 Dalton. 



Muncke.' 



1 Edin. Journ. Sci. VIII. 171. 



2 Edin. Journ. Sci. IX. 102. Phil. Trans. 1828, p. 301. 

 8 Mem. Lit. and Phil. Soc. Matn-hest. V. 82. 



« Ann. Chcm. et Phys. XXXIX. 415. 



" 3. 



" 8. 



« 9. 



" 11. 



" 15. 



" 15. 



" 16. 



" 18. 



" 19. 



" 26. 



" 29. 



" 29. 



" 30. 

 Nov. 8. 



" 11. 



" 11. 



" 11. 



New York. Hough. Arago. 



New Haven. Herrick. Loomis. 



New York. Hough. Arago. 



G. Britain or Ireland. Dalton. 



New York. Hough. Arago. 



New York. Hough. Arago. 



G. Britain or Ireland. Dalton. Arago. 



Islay and Edinburgh. Quetelet and Muncke. 1 



Gosport. 2 Burney. 



New York. Hough. Arago. 



New Haven. Herrick. Loomis. 



Wilmington. Gibbon. 



New York. Hough. 



Wilmington. Gibbon. Arago. 



Finmark. Keilhau. 8 



New York. Hough. 



G. Britain or Ireland. Dalton. 



Cornwall. Gilbert. Alford. Farqiiliarson. 4 



Netherlands. Arago, Quetelet, and Muncke. 6 



Near Stevenage. Kater. 6 Lynn Regis. Dtting. 



Plymouth. Harvey. 7 Gosport. Burner. 



New York. Hough. 



Plymouth. Burney. Arago. 



Finmark. Keilhau. 



New York. Hough. Arago. 



New York. Hough. Arago. 



G. Britain or Ireland. Dalton. 



New York. Hough. Arago. 



G. Britain or Ireland. Dalton. 



Perth, Scotland. Muncke and Quetelet.* 



Finmark. Keilhau. . 



Finmark. Keilhau. 



Finmark. Keilhau. 



Christian's Sound. Graah. 9 Force. 



G. Britain or Ireland. Dalton. 



Perth. Muncke, Arago, and Quetelet. 



Finmark. Keilhau. 



New York. Hough. Arago. 



Finmark. Keilhau. 



Tobolsk. Erman. 10 Muncke. 



Arago and Quetelet. 



> Edin. Journ. Sci. X. 177. 



a Phil. Mag. IV. 392. 



8 Pogg. Ann. XIV. 621. 



4 Phil. Trans. 1829, p. 103, and 1839, p. 267. 



6 Ann. Chem. et Phys. XXXIX. 418. Smyth's Cel.Cyc. 1. 1 66. 



6 Phil. Mag. IV. 337. 



7 Edin. Journ. Sci. X. 146. 



8 Edin. Journ. Sci. X. 179. 



9 Narrative of an Expedition, &c. p. 48. 

 10 Pogg. Ann. XXII. 550. 



