128 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Oct 



N 



Sept.24. 

 25. 

 25. 

 27. 

 30. 



2. 



4. 

 11. 

 18. 

 19. 

 19. 

 20. 

 21. 

 22. 

 22. 

 22. 

 23. 

 23. 

 27. 

 29. 

 31. 

 ov. 12. 

 13. 

 13. 

 13. 

 13. 

 15. 

 15. 

 17. 

 19. 

 20. 

 20. 

 21. 

 22. 

 23. 

 28. 

 29. 

 30. 

 Dec. 7. 

 11. 

 12. 

 13. 

 13. 

 13. 

 14. 

 16. 

 17. 

 17. 



New Tori: Hough. 

 Jakobshavn. Rudolph. 

 New York. Hough. 

 Toronto. Sabine. 

 Christiania. Hansteen. 

 New York. 



Toronto. Sabine. 



Jakobshavn. 

 New York, 

 Christiania. 

 Neil) York. 



New Yuri:. 

 Cambridge. 

 New Haven. 

 Christiania. 

 New Haven. 

 New York. 

 Nero Haven. 



Hough. 



Rudolph. 



Hough. 



Hansteen. 



Hough. Toronto. Sabine. 

 Parma. Colla. 1 Jakobshavn. Rudolph. 

 New York. Hough. Newberry. Johnson. 



Hough. Paris. Bouvard. 



Lovering. Newberry. Johnson. 

 Herrick. Newton and Loomis. 



Hansteen. Italy ? Hough. 



Herriek. Newton and Loomis. 



Hough. 



Herrick. Newton and Loomis. 

 Brussels. Quetelet. Italy ? Hough. 

 New Haven. Herrick. Newton and Loomis. 

 Paris. Laugier. Boue\ 

 New Haven. Herrick. Newton and Loomis. 

 Neio York. Hough. Toronto. Sabine. 

 Providence, R. I. Caswell. 

 Washington, D. C. Gilliss. 

 New Haven. Herrick. Newton and Loomis. 



Hough. Providence. Caswell. 



Hough. Dunse. Stevenson. 



Hough. 



Herrick. Newton and Loomis. 



Hough. Jakobshavn. Rudolph. 

 Christiania ? Hough. Kaafiord. Ihle. Reich. 

 Christiania. Hansteen. 



Herrick. Newton and Loomis. 



Rudolph. 

 Lovering. 



Herrick. Newton and Loomis. 

 Nijne-Taguilsk. Demidoff. 

 Brussels. Quetelet. 

 Christiania. Hansteen. 



Herrick. Newton and Loomis. 



Rudolph. 



Hansteen. 



Hough. Nijne-Taguilsk. 



Rudolph. 



Hough. Jakobshavn. Rudolph. 



Herrick. Newton and Loomis. 



New York. 

 New York. 

 New York. 

 Neic Haven. 

 New York. 



New Haven. 

 Jakobshavn. 

 Cambridge. 

 New Haven. 



New Haven. 

 Jakobshavn. 

 Christiania. 

 New Fork. 

 Jakobshavn. 

 New York. 

 New Haven. 



L'Institut. Sci. Hath. Phys. &c. VIII. 57 and 180. 



Dec. 20. Neic York. Hough. Toronto. Sabine. 



" 20. Christiania. Hansteen. 



" 21. New Haven. Herrick. Newton and Loomis. 



" 21. Newberry. Johnson. New York. Hough. 



" 21. Brussels. Quetelet. 



" 21. Putin. Schmidt. 



" 21. Cltristiania. Hansteen. 



" 21. Catharinebourg. 1 Kupffer. 



" 21. Bogoslowski. Kupffer. 



" 22. New Haven. Herrick. Newton and Loomis. 



" 23. Christiania. Hansteen. 



" 24. New Haven. Herrick. Newton and Loomis. 



" 24. Christiania. Hansteen. Parma. Colla. 



" 25. New York. Hough. 



" 28. New Haven. Herrick. Newton and Loomis. 



" 28. Toronto. Sabine. Parma. Colla. 



" 31. Christiania. Hansteen. 



1841. 



Jan. 10. Zlatoouste? Kupffer. 



" 11. Zlatoouste. Kupffer. 



" 14. Cambridge. Bond. Lovering. 



" 14. New York. Hough. 



" 15. Cltristiania. Hansteen. 



" 18. Toronto. Sabine. 



" 19. Christiania. Hansteen. 



" 20. Christiania. Hansteen. 



" 22. New Haven. Herrick. Newton and Loomis. 



" 24. Brussels. Quetelet. Toronto. Sabine. 



" 24. Christiania. Hansteen. 



" 25. New Haven. Herrick. Newton and Loomis. 3 



" 25. Toronto. Sabine. Christiania. Hansteen. 



27. Cambridge. Bond. Lovering. 8 



27. Toronto. Sabine. 4 



28. New Haven. Herrick. Newton and Loomis. 

 31. Christiania. Hansteen. 



" x. Eutin. Schmidt. 



Feb. 7. Cambridge. Bond. Lovering. 



" 7. New Haven. Herrick. Newton and Loomis. 



" 7. New York. Hough. 



" 8. New Haven. Herrick. Newton and Loomis. 



" 8. New York. Hough. Providence. Caswell. 



" 8. Newberry. Johnson. Jakobshavn. Rudolph. 



" 9. New York. Hough. Jakobshavn. Rudolph. 



" 11. New York. Hough. Toronto. Sabine. 



1 Annaaire Magnet, et Meteor, de Russie, 1840, p. 72, &c. 



2 Bull, de l'Aead. Brux. VIII. Pt. II. p. 64. 



8 From the Meteor. Records of the Harvard College Observa- 

 tory, not yet published. 



* Observ. during unusual Magnet. Disturb. Pt. I. p. XXII. 



