ON THE PERIODICITY OF THE AURORA BOREALIS. 



143 



Sept. 22. Makerstoun. Broun. Hoharton. Sabine. 



" 22. Yakoutsk. Kupffer. Bonn. Schmidt. 



" 23. Cambridge. Bond. Lovering. 



" 23. New Haven. Herrick. Newton and Loomis, 



" 23. New York. Hough. Providence. Caswell. 



" 23. Hartford. Herrick. Newton and Loomis. 



" 23. Christiania. Hansteen. 



" 24. Christiania. Hansteen. 



" 25. New York. Hough. 



" 27. England. Hough. 



Oct. 2. New York. Hough. Toronto. Sabine. 



" 7. Cambridge. Bond. Lovering. 



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



" 8. New York. Hough. Makerstoun. Broun. 



" 9. Makerstoun. Broun. Toronto. Sabine. 



" 10. New Haven ? Herrick. Newton and Loomis. 



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



" 11. Toronto. Sabine. Christiania. Hansteen. 



" 12. Jakobshavn. Rudolph. 



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



" 15. New York. Hough. 



" 16. Repulse Bay. Rae. 



" 17. Repulse Bay. Rae. Ireland. Hough. 



" 18. Repulse Bay. Rae. 



" 19. Cambridge. Bond. Lovering. 



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



" 19. New York. Hough. Newberry. Johnson. 



" 19. Christiania. Hansteen. Toronto. Sabine. 



" 19. Makerstoun. Broun. Dunse. Stevenson. 



" 19. Jakobshavn. Rudolph. 



" 20. Christiania. Hansteen. 



" 21. Cambridge. Bond. Lovering. 



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



" 21. New York. Hough. 



" 21. Christiania. Hansteen. Repulse Bay. Rae. 



" 21. Jakobshavn. Rudolph. 



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



" 22. Newberry. Johnson. 



" 22. Makerstoun. Broun. Jakobshavn. Rudolph. 



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



" 25. Jakobshavn. Rudolph. 



" 27. Repulse Bay. Rae. 



" 28. Repulse Bay. Rae. Jakobshavn. Rudolph. 



" 29. Repidse Bay. Rae. 



Nov. 5. Repulse Bay. Rae. 



" 6. Repulse Bay. Rae. 



" 11. New Haven ? Herrick. Newton and Loomis. 3 



" 11. Bonn. Schmidt. 



1 Amer. Journ. Sci. Second Series, III. 126. 



Nov. 13. New York. Hough. 



" 13. Bonn. Schmidt. Christiania. Hansteen. 



" 14. Repulse Bay. Rae. 



" 1G. Christiania. Hansteen. 



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



" 17. New York. Hough. 



" 17. Bonn. Schmidt. Brussels. Quetelet. 



" 17. Makerstoun. Broun. Dunse. Stevenson. 



" 17. Kingstown, near London. Starkey. 



" 17. Repulse Bay. Rae. Christiania. Hansteen. 



" 18. Brussels. Quetelet. 



" 20. Repidse Bay. Rae. 



" 21. Bonn. Schmidt. 



" 22. Repidse Bay. Rae. Jakobshavn. Rudolph. 



" 23. Repulse Bay. Rae. 



" 25. Repulse Bay. Rae. 



" 26. Yakoutsk. Kupffer. 



" 30. Jakobshavn. Rudolph. 

 Dec 4. New Haven ? Herrick. Newton and Loomis. 



" 4. Amsterdam. 1 



" 5. Repulse Bay. Rae. 



" 9. Cambridge. Bond. Lovering. 



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



" 9. New York. Hough. Newberry. Johnson. 



" 9. Christiania. Hansteen. Jakobshavn. Rudolph. 



" 9. Makerstoun. Broun. 



" 10. Christiania. Hansteen. 



" 11. Bonn. Schmidt. Cliristiania. Hansteen. 



" 13. Bonn. Schmidt. Repulse Bay. Rae. 



" 13. Christiania. Hansteen. Jakobshavn. Rudolph. 



" 14. New Haven? Herrick. Newton and Loomjs. 



" 14. Repulse Bay. Rae. 



" 15. Repulse Bay. Rae. Jakobshavn. Rudolph. 



" 16. Bonn. Schmidt. 



" 17. Repulse Bay. Rae. Bonn. Schmidt. 



17. Jakobshavn. Rudolph. 



18. Repulse Bay. Rae. 



21. Repulse Bay. Rae. 



22. New York. Hough. 

 ; 23. New Haven. Herrick. Newton and Loomis. 

 ' 23. New York. Hough. 

 1 23. Christiania. Hansteen. Jakobshavn. Rudolph. 



Jan. 2. 



" 3. 



" 4. 



6. 



Repulse Bay. 

 Repulse Bay. 

 Repulse Bay. 

 Repulse Bay. 



1847. 



Rae. 

 Rae. 

 Rae. 

 Rae. 



» Pogg. Ann. LXVH.591. 



