ON THE PERIODICITY OF THE AURORA BOREALIS. 



149 



Aug. 22. Quebec, Montreal, and London. Lefroy. 



" 28. Toronto. Lefroy. 



" 29. Christiania. Hansteen. 



" 31. Christiania. Hansteen. 



Sept. 3. New Haven. Herrick. Newton and Loomis. 



" 3. Quebec and Kingston. Lefroy. 



" 4. Newberry. Johnson. Toronto. Lefroy. 



" 4. Quebec, Montreal, and Kingston. Lefroy. 



" 4. Christiania. Hansteen. 



" 5. Makerstoun. Broun. 



" 9. New York. Hough. 



" 12. Russia. Hough. 



" 13. Russia. Hough. 



" 17. Kingston. Lefroy. Christiania. Hansteen. 



" 18. Quebec and Kingston. Lefroy. 



" 18. Christiania. Hansteen. 



" 19. Christiania. Hansteen. 



" 20. Toronto. Lefroy. 



" 29. Toronto. Lefroy. 



" 30. Toronto. Lefroy. 



Oct. 1. Fort Confidence, Gr. Br. Lake. Richardson. 1 



" 2. Quebec. Lefroy. 



" 4. Quebec. Lefroy. 



" 5. New York. Hough. 



" 6. Cambridge ? Bond. 2 Lovering. 



" 8. New York. Hough. Toronto. Lefroy. 



" 8. Quebec, Montreal, and Kingston. Lefroy. 



" 10. New York. Hough. 



" 13. Fort Confidence. Richardson. 



" 17. New Haven and Virginia. Hough. 



" 17. Toronto. Lefroy. England. Hough. 



" 17. Fort Confidence. Richardson. 



" 18. Toronto. Lefroy. Virginia. Hough. 



" 18. Fort Confidence. Richardson. 



" 18. Prestwich. Sturgeon. 3 Dunse. Stevenson. 



" 18. Stonyhurst. Weld. 4 



" 18. Gorki. Kupffer. Spain. Rico. 6 



" 18. Kremsominster. Littrow. Arago. 



" 18. Christiania. Hansteen. Koursk. Kupffer. 



" 18. Makerstoun. Broun. Hobarton. Sabine. 



" 19. Worcester. Chandler. 



" 19. London, Canada West. Lefroy. 



" 19. Stonyhurst. Weld. Schmidt. Jahn. 



" 19. Christiania. Hansteen. Yakoutsk. Kupffer. 



1 Magnet, and Meteor. Obserr. at Lake Athabasca, &c. p. 329. 

 ' 2 New York Tribune of Oct. 10. 



3 Edin. New Phil. Journ. XL VII. 148. 



4 Phil. Mag. Third Series, XXXIII. 376. 

 6 Mem. Acad. Cienc. Madrid, III. 77. 



Oct. 19. 



" 19. 



" 20. 



" 20. 



" 20. 



" 21. 



" 21. 



" 21. 



" 22. 



" 22. 



" 22. 



" 23. 



" 23. 



" 23. 



" 23. 



" 23. 



« 23. 



" 23. 



" 23. 



" 24. 



" 24. 



" 24. 



" 24. 



" 24. 



" 25. 



" 25. 



" 25. 



" 25. 



" 25. 



" 25. 



" 25. 



" 26. 



" 26. 



" 26. 



" 26. 



" 27. 



" 27. 



" 27. 



" 28. 



" 28. 



" 29. 



" 30. 



" 30. 



" 30. 



" 31. 

 Nov. 1. 



" 1. 



•" 2. 



" 2. 



" 3. 



Makerstoun. Broun. 



Fort Confidence. Richardson. 



Stonyhurst. Weld. Christiania. Hansteen. 



Makerstoun. Broun. 



Fort Confidence. Richardson. 



England. Hough. Christiania. Hansteen. 



Makerstoun. Broun. 



Fort Confidence. Richardson. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. 



Kingston, Toronto, and London. Lefroy. 



Makerstoun. Broun. Schmidt. Jahn. 



New Haven. Herrick. Newton and Loomis. 

 Providence, Rhode Island. Caswell. 

 New York. Hough. Newberry. Johnson. 

 Montreal, Toronto, and Kingston. Lefroy. 



Aix-la-Chapelle. Heis. Schmidt. Jahn. 



Koursk. Kupffer. Christiania. Hansteen. 

 Fort Confidence. Richardson. 



Toronto. Lefroy. Schmidt. 



Fort Confidence. Richardson. 

 Paris. De la Pylaie. Jahn. 

 Aix-la- Chapelle. Heis. 

 Makerstoun. Broun. 



Bond. Lovering. 



Cambridge. 

 Providence. 

 New Haven 

 New York. 



Caswell. 



Herrick. Newton and Loomis. 

 Hough. Newberry. Johnson. 

 Quebec and Toronto. Lefroy. 



Aix-la-Chapelle. Heis. Schmidt. Jahn. 



Fort Confidence. ~R\c\\a.Y(is,cm. Koursk. Kupffer. 

 New Haven. Herrick. Newton and Loomis. 

 Fort Confidence. Richardson. 



Aix-la-Chapelle. Heis. Schmidt. Jahn. 



Christiania. Hansteen. Makerstoun. Broun. 

 Nexoberry. Johnson. Quebec. Lefroy. 

 Fort Confidence. Richardson. 

 Prestwich. Sturgeon. Jakobshavn. Rudolph. 

 Newberry. Johnson. Quebec. Lefroy. 



Fort Confidence. Richardson. Schmidt. 



Kingston. Lefroy. 

 New York. Hough. 



Quebec. Lefroy. Schmidt. 



Fort Confidence. Richardson. 

 Kingston and Toronto. Lefroy. 

 Fort Confidence. Richardson. 

 Jakobshavn. Rudolph. 

 Newberry. Johnson. 

 Fort Confidence. Richardson. 

 Fort Confidence. Richardson. 



