140 



ON THE PERIODICITY OF THE AURORA BOREALI8. 



Apr. 15. 



" 19. 



" 23. 



« 27. 



« 30. 



« 30. 



" 30. 

 May 1. 



" 5. 



« 11. 



« 29. 

 June 5. 



" 17. 



" 24. 



" 25. 



" 30. 

 July 4. 



" 5. 



" 8. 



" 8. 



" 24. 



» 24. 



" 24. 



" 25. 



" 28. 



" 31. 

 1. 

 1. 



" 2. 



" 3. 



" 4. 



" 26. 



« 27. 



Au 



Makerstoun. Broun. 



Sitka. Kupffer. Makerstoun. Broun. 



Chrisliania. Hansteen. 



New Haven. Herrick. Newton and Loomis. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Loomis. 1 



New Fork. Hough. Makerstoun. Broun. 



New Haven ? Herrick. Newton and Loomis. 



New Haven. Herrick. Newton and Loomis. 



Makerstoun. Broun. 



New York. Hough. 



New Haven ? Herrick. Newton and Loomis. 



New Haven ? Herrick. Newton and Loomis. 



Neic Haven ? Herrick. Newton and Loomis. 



Worcester. Herrick. Newton and Loomis. 



Toronto. Sabine. 



New York. Hough. 



Toronto. Sabine. 



Worcester. Herrick. Newton and Loomis. 



Toronto. Sabine. 



New Haven ? Herrick. Newton and Loomis. 



Worcester. Herrick. Newton and Loomis. 



New York. Hough. Toronto. Sabine. 



Hough. 

 Bradley. Newton and Loomis. 

 Herrick. Newton and Loomis. 

 Herrick. Newton and Loomis. 



Hou»h. Toronto. Sabine. 



« 29. 



« 29. 



" 29. 



« 29. 



" 29. 



» 30. 



« 30. 



« 30. 



« 30. 



« 31. 

 Sept. 1. 



» 1. 



" 2. 



« 3. 



New York. 

 New Haven. 

 New Haven. 

 New Haven. 

 New York. 

 Toronto. Sabine. 

 New York. Hough 

 New Haven. 

 New York. 

 New York. 



Herrick. Newton and Loomis. 



Hough. 



Hough. 



New Haven ? Herrick. Newton and Loomis. 2 

 Worcester. Herrick. Newton and Loomis. 

 Bilk. Schmidt. Huggate. Rankin. 8 

 Makerstoun. Broun. Dunse. Stevenson. 

 Sitka. Kupffer. 



From Dusseldorf to Cologne. Schmidt. 

 New Haven ? Herrick. Newton and Loomis. 

 New York. Hough. Montreal. Olmsted. 

 Chrisliania. Hansteen. Makerstoun. Broun. 

 Christiania. Hansteen. 

 From Dusseldorf to Cologne. Schmidt. 

 Jakobshavn. Rudolph. 

 Christiania. Hansteen. Makerstoun. Broun. 

 Toronto. Sabine. 



Oct. 



1 Bull, de l'Acad. Brux. XII. Pt. II. p. 226. 



2 Bull, de l'Acad. Brux. XIU. Pt. I p. 745. 

 8 Proc. Brit. Assoc. XV. 15. 



Sept. 4. 

 " 7. 

 " 7. 

 " 8. 

 " 17. 

 " 18. 

 " 20. 

 " 24. 

 « 24. 

 « 24. 

 " 24. 

 " 25. 

 25. 

 25. 

 25. 

 26. 

 26. 

 27. 

 27. 

 27. 

 28. 

 29. 

 1. 



" 2. 

 " 4. 

 " 5. 

 " 6. 

 " 7. 

 " 8. 

 9. 

 " 9. 

 " 19. 

 « 20. 

 " 21. 

 « 21. 

 « 21. 

 « 21. 

 " 22. 

 « 23. 

 « 28. 

 « 29. 

 " 31. 

 « 31. 

 Nov. 1. 

 " 2. 

 « 3. 

 « 4. 

 « 5. 

 " 5. 

 « 9. 



Gothaab. Block. 



New Haven. Herrick. Newton and Loomis. 



Toronto. Sabine. Gothaab. Block. 



New York. Hough. Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Ausland. Boue. Gothaab. Block. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Loomis. 



Jakobshavn. Rudolph. Toronto. Sabine. 



From Dusseldorf to Cologne. Schmidt. 



Cambridge. Bond. Lovering. 



New Haven ? Herrick. Newton and Loomis. 



Toronto. Sabine. Gothaab. Block. 



From Dusseldorf to Cologne. Schmidt. 



Toronto. Sabine. Gothaab. Block. 



Bilk. Schmidt. Makerstoun. Broun. 



New York. Hough. Gothaab. Block. 



New Haven. Herrick. Newton and Loomis. 



Makerstoun. Broun. Jakobshavn. Rudolph- 



Gothaab. Block. 



Jakobshavn. Rudolph. Gothaab. Block. 



Christiania. Hansteen. Jakobshavn. Rudolph. 



Makerstoun. Broun. 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



New York. Hough. 



New Haven. Herrick. Newton and Loomis. 



Jakobshavn. Rudolph. 



Toronto. Sabine. Makerstoun. Broun. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Loomis. 



Newberry. Johnson. New York. Hough. 



Gothaab. Block. 



Makerstoun, Broun. 



Jakobshavn. Rudolph. Gothaab. Block. 



Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. 



Makerstoun. Broun. Gothaab. Block. 



Christiania. Hansteen. 



Sitka. Kupffer. Gothaab. Block. 



Gothaab. Block. 



Christiania. Hansteen. Makerstoun. Broun. 



Christiania. Hansteen. 



Makerstoun. Broun. Gothaab. Block. 



Toronto. Sabine. 



