130 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



July 20. 



" 21. 



" 21. 



" 24. 



" 25. 



" 28. 



" 29. 



Aug. 2. 



3. 



« 4. 



" 5. 



" C. 



« 6. 



" 6. 



" 6. 

 7. 



" 11. 



" 14. 



" 14. 



" 14. 



" 16. 



" 17. 



" 22. 



" 23. 



" 23. 



" 24. 



" 26. 



" 27. 

 Sept. 5. 



" 10. 

 11. 



" 12. 



•• 12. 

 12. 



" 13. 



" 13. 



« 14. 



« 14. 



" 14. 



" 15. 



" 16. 



" 17. 



" 18. 



" 18. 



" 24. 



" 25. 



New Tori: 



New Haven 



New York. 



New York. Hough. 



New York. Hough. 



Toronto. Sabine. 



New Tork. Hough 



New Haven 



New York. 



New York. 



New York. 



Hough. Hobarton. Sabine. 



Herrick. Newton and Loomis. 

 Hou<*h. Toronto. Sabine. 



Worcester. Woodward. 

 Newton and Loomis. 1 



New York. 

 New York. 

 New York. 

 New Haven. 



Toronto. Sabine. 

 Newton and Loomis. 



Herrick 



Hough. 



Hough. 



Hough. 



Worcester, Mass. Woodward. 

 New York. Hough. Washington, D.C Gilliss. 

 New Haven. Herrick. Newton and Loomis. 

 Toronto. Sabine. Dunse. Stevenson. 

 New York. Hough. 

 New York. Hough. 



New York. Hough. Washington, D.C. Gilliss. 

 New Haven. Herrick. Newton and Loomis. 

 Toronto. Sabine. 

 New York. Hough. 



Hough. 



Hough. 



Hough. 

 Herrick 

 Toronto. Sabine. 

 Christiania. Hansteen. 

 New York. Hough. Christiania. Hansteen. 

 Gothaab, Greenland. Block. 2 

 Gothaab. Block. 

 Toronto. Sabine. 

 New York. Hough. 



Michigan. Nicollet. Newton and Loomis. 8 

 Montreal. Olmsted. Newton and Loomis. 

 New Haven. Herrick. Newton and Loomis. 

 Christiania. Hansteen. 

 New Haven. Herrick. Newton and Loomis. 

 Michigan. Nicollet. Newton and Loomis. 

 New York. Hough. 

 Gothaab. Block. 

 New York. Hough. 

 Gothaab. Block. 

 New York. Hough. 



New Haven. Herrick. Newton and Loomis. 

 Christiania. Hansteen. Gothaab. Block. 

 New Haven. Herrick. Newton and Loomis. 



i Bull, de l'Acad. Brux. IX. Pt. I. 185. 



2 Collect. Meteor. Soc. Sci. Danicoe. Fasc. IV. p. 167. 



8 Trans. Amer. Phil. Soc. VIII. 323. 



Sept.25. 



" 25. 



" 25. 



" 26. 



" 26. 



Oct. 5. 



" 6. 



" 7. 



" 8. 



" 8. 



" 9. 



" 9. 



" 9. 



" 9. 



" 10. 



" 11. 



" 12. 



" 13. 



" 14. 



" 14. 



" 14. 



" 14. 



" 15. 



" 15. 



" 16. 



" 18. 



" 18. 



" 19. 



" 20. 



" 20. 



" 21. 



" 24. 



" 25. 



" 28. 



" 29. 

 Nov. 1. 



" 1. 



" 2. 



« 3. 



" 5. 



" 5. 



" 6. 



" 7. 



" 7. 



" 8. 



" 8. 



« 8. 



" 9. 



" 10. 



« 11. 



Christiania. 

 Cambridge. 

 New Haven. 

 New York. 

 New York. 



Jakobshavn. 

 Cambridge. 

 New Haven. 



Washington, D. C. Gilliss. 



New York. Hough. Toronto. Sabine. 



Hansteen. Dunse. Stevenson. 



Bond. Lovering. 

 Herrick. Newton and Loomis. 



Hough. 



Hough. Gothaab. Block. 

 Toronto. Sabine. Gothaab. Block. 

 New York. Hough. Toronto. Sabine. 



Rudolph. Gothaab. Block. 



Bond. Lovering. 

 Herrick. Newton and Loomis. 

 Providence, R. I. Caswell. New York. Hough. 

 Toronto. Sabine. Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block. 

 New York. Hou° 

 Cambridge. 

 New Haven. 

 Worcester. 

 Jakobshavn. 

 Cambridge. 

 Christiania. 

 Gothaab. 



Brussels. Quetelet. 

 Geneva. Wartmann. 

 Gothaab. Block. 



New Haven. Herrick. Newton and Loomis. 

 Gothaab. Block. 



Cambridge. Bond. Lovering. Gothaab. Block. 

 Toronto. Sabine. 



New Haven. Herrick. Newton and Loomis. 

 Christiania. Hansteen. 

 Christiania. Hansteen. 

 New York. Hough. Canada. Hough. 

 Gothaab. Block. 

 Gothaab. Block. 

 Gothaab. Block* 



New Haven ? Herrick. Newton and Loomis. 

 New York. Hough. Gothaab. Block. 



Hansteen. Gothaab. Block. 

 Hansteen. Gothaab. Block. 

 Rudolph. 



Herrick. Newton and Loomis. 

 Christiania. Hansteen. 



Jakobshavn. Rudolph. 



_h. Gothaab. Block. 

 Bond. Lovering. 



Herrick. Newton and Loomis. 

 Herrick. Newton and Loomis. 

 Rudolph. Gothaab. Block. 

 Bond. Lovering. 

 Hansteen. Gothaab. Block. 

 Block. 



Arago. 

 Christiania. Hansteen. 



Christiania. 



Christiania. 



Jakobshavn. 



New Haven. 



Toronto. Sabine. 



Gothaab. Block. 



Gothaab. Block. 



New York. Hough. Christiania. Hansteen. 



Christiania. Hansteen. Gothaab. Block. 



