134 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Dec. 8. Gothaab. Block. 



" 9. Christiania. Hansteen. 



" 14. Gothaab. Block. 



" 17. New York. Hough. 



" 18. Gothaab. Block. 



" 19. New York. Hough. 



" 20. Gothaab. Block. 



" 21. Jakobshavn. Rudolph. 



" 22. Gothaab. Block. 



" 27. Cambridge. Bond. Lovering. 



" 27. Christiania. Hansteen. 



" 28. Christiania. Hansteen. Gothaab. Block. 



" 29. Gothaab. Block. 



" 31. Hobarton, Van Dieman's Land. Sabine. 



Jan 

 u 



2. 



2. 



" 5. 

 " G. 



8. 

 " 10. 

 " 12. 

 " 13. 

 " 17. 

 « 20. 

 " 21. 

 " 22. 

 « 23. 

 « 24. 

 " 25. 

 " 27. 

 " 28. 

 " 28. 

 " 28. 

 « 29. 

 " 29. 

 « 30. 

 " 31. 

 Feb. 3. 

 « 4. 



6. 

 " 13. 

 « 14. 

 « 15. 

 " 17. 

 « 18. 



1843. 



Hamburg. Schmidt. Christiania. Hansteen. 



Jakobshavn. Rudolph. 



Christiania. Hansteen. 



Gothaab. Block. 



Gothaab. Block. 



New York. Hough. 



Scotland. Hough. 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. 



Gothaab. Block. 



New York. Hough. Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. 



Hansteen. Gothaab. Block. 



Makerstoun. Broun. 1 



Rudolph. 



Hough. 

 Hansteen. Gothaab. Block. 



Christiania. 



Edinburgh. 



Jakobshavn. 



New York. 



Christiania. 



Gothaab. Block. 



New York. Hough 



New York. 



New York. 



Christiania. 



New York. 



Gothaab. 



Hough. 

 Hough. 

 Hansteen. 

 Hough. 

 Block. 



Gothaab. Block. 



Christiania. Hansteen. 



New York. Hough. Gothaab. 



Block. 



i Edin. Phil. Trans. XIX. Pt. 2. The time of these observa- 

 tions has been reduced from Gottingen Astron. time to the mean 

 civil time of the place. 



Feb. 19. 



" 20. 



" 20. 



" 21. 



" 22. 



" 23. 



" 23. 



" 24. 



" 24. 



" 24. 



" 25. 



" 25. 



" 26. 



" 28. 

 Mar. 2. 



« 3. 



" 4. 



" 4. 

 5. 



" 5. 



" 6. 



" 6. 



" 6. 



" 6. 



" 7. 

 7. 



" 11. 



" 12. 



" 12. 



" 13. 



" 17. 



" 17. 



" 18. 



" 18. 



" 19. 



" 20. 



" 21. 



" 22. 



" 22. 



" 25. 



" 27. 



" 29. 



" 29. 



" 29. 



« 30. 

 Apr. 2. 



" 2. 



" 3. 



Christiania. Hansteen. 

 Christiania. Hansteen. 

 Jakobshavn. Rudolph. 

 Gothaab. Block. 

 Christiania. Hansteen. 



Gothaab. 

 Gothaab. 



Block. 

 Block. 



Gothaab. Block. 



New York. Hough. Christiania. Hansteen. 



Gothaab. Block. 



Philadelphia. Bache. 1 



New York. Hough. Christiania. Hansteen. 



3fakerstoun. Broun. Jakobshavn. Rudolph. 



New York. Hough. Christiania. Hansteen. 



Gothaab. Block. 



New York. Hough. 



Gothaab. Block. 



Hamburg. Schmidt. 



Gothaab. Block. 



New York. Hough. Newberry. Johnson. 



Christiania. Hansteen. Gothaab. Block. 



New York. Hough. Christiania. Hansteen. 



Gothaab. Block. 



New Haven. Herriek. Newton and Loomis. 



New York. Hough. Providence. Caswell. 



Toronto. Sabine. Christiania. Hansteen. 



Gothaab. Block. 



New York. Hough. Christiania. Hansteen. 



Makerstoun. Broun. 



Jakobshavn. Rudolph. 



Holland. Hough. Makerstoun. Broun. 



Gothaab. Block. Jakobshavn. Rudolph. 



Parma. Colla. Gothaab. Block. 



New Haven. Herriek. Newton and Loomis. 



Gothaab. Block. 



New York. Hough. Christiania. Hansteen. 



Gothaab. Block. 



Christiania. Hansteen. 



Hansteen. 



Hansteen. 



Hansteen. 



Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block. 



Jakobshavn. Rudolph. 



Christiania. 



Christiania. 



Christiania. 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Newberry. Johnson. 



Christiania. Hansteen. Gothaab. Block. 



Makerstoun. Broun. Dunse. Stevenson. 



Christiania. Hansteen. Gothaab. Block. 



New Haven. Herriek. Newton and Loomis. 



New York. Hough. 



Gothaab. Block. 



Magnet, and Meteor. Observ. Girard College, II. 124S. 



