152 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Toronto. Lefroy. 



Christiania. Hansteen. Jakobshavn. Rudolph. 



Makerstoun. Broun. 



Fort Confidence. Richardson. 



Smeena. Boue. 1 



Fort Confidence. Richardson. 



New York. Hough. 



Fort Confidence. Richardson. 



Makerstoun. Broun. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Quebec. Lefroy. 



Quebec. Lefroy. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



Makerstoun. Broun. 



Quebec and Montreal. Lefroy. 



Fort Confidence. Richardson. 



Christiania. Hansteen. 



New Haven. Herrick. Newton and Loomis, 



Neic York. Hough. Xeicberry. Johnson. 



Quebec, Toronto, and Halifax. Lefroy. 



Fort Confidence. Richardson. 



Makerstoun. Broun. 



Toronto. Lefroy. 



Quebec and Penetanguishene. 



Montreal and Newfoundland. 



New Haven. Herrick. Newton and Loomis. 



Providence. Caswell. New York. Hough. 



Toronto and London, C. W. Lefroy. 



Newfoundland and Quebec. Lefroy. 



Fort Confidence. Richardson. 



New York. Hough. 



Penetanguishene. Lefroy. 



Fort Confidence. Richardson. 



New Haven ? Bradley. Newton and Loomis. 



New York. Hough. Neieberry. Johnson. 



Quebec, Kingston, and Toronto. Lefroy. 



London and Penetanguishene. Lefroy. 



England. Hough. Christiania. Hansteen. 



Makerstoun. Broun. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Loomis. 



New York. Hough. Providence. Caswell. 



Newberry. Johnson. Newfoundland. Lefroy. 



Quebec, Toronto, and Halifax. Lefroy. 



1 Kreil's Jahrbuch fur Prag. I. 415. 



Lefroy. 

 Lefroy. 



Feb. 19. Fort Confidence. Richardson. 



" 19. Prestwich. Sturgeon. Dunse. Stevenson. 



" 19. Makerstoun. Broun. Leipsic. Jahn. 



" 20. Quebec and Halifax. Lefroy. 



" 20. Newfoundland. Lefroy. Tobolsk. Kupffer. 



" 20. Fort Confidence. Richardson. 



" 20. Christiania. Hansteen. Dunse. Stevenson. 



" 20. Makerstoun. Broun. Leipsic. Jahn. 



" 21. New York. Hough. Newberry. Johnson. 



" 21. Quebec and Halifax. Lefroy. 



" 21. Fort Confidence. Richardson. 



" 21. Christiania. Hansteen. 



" 21. Makerstoun. Broun. Leipsic. Jahn. 



" 22. Newfoundland. Lefroy. Koursk. Kupffer. 



" 22. Bonn. Schmidt. Oxford. Slatter. 1 



" 22. Brussels. Quetelet. Christiania. Hansteen. 



" 22. Makerstoun. Broun. Leipsic. Jahn. 



" 23. Newfoundland. Lefroy. 



" 23. Fort Confidence. Richardson. 



" 23. Christiania. Hansteen. 



" 24. Makerstoun. Broun. 



" 24. Fort Confidence. Richardson. 



" 25. Quebec. Lefroy. 



" 25. Fort Confidence. Richardson. Schmidt. 



" 26. Toronto and Penetanguishene. Lefroy. 



" 26. Newfoundland and Kingston. Lefroy. 



" 26. Fort Confidence. Richardson. 



" 26. Aix-la-Chapelle. Heis. 2 



" 26. Makerstoun. Broun. 



" 27. Montreal, Kingston, and Toronto. Lefroy. 



" 27. Halifax and Penetanguishene. Lefroy. 



" 27. Netcfoundland, Quebec, and London. Lefroy. 



" 27. Fort Confidence. Richardson. 



" 27. Brussels. Quetelet. Leipsic. Jahn. Schmidt. 



" 27. Aix-la-Chapelle. Heis. Pegav. Kuhn. Jahn. 



" 28. New York. Hough. Makerstoun. Broun. 



Mar. 1. Fort Confidence. Richardson. 



" 3. Fort Confidence. Richardson. 



" 6. Quebec. Lefroy. 



" 6. Fort Confidence. Richardson. 



" 8. Fort Confidence. Richardson. 



" 9. London, C. W. Lefroy. 



" 11. Fort Confidence. Richardson. 



" 12. Christiania. Hansteen. 



" 12. Fort Confidence. Richardson. 



" 14. New York. Hough. Illinois. 



" 14. Fort Confidence. Richardson. 



1 Phil. Mag. Third Series, XXXV. 71. 



2 Bull, de l'Aead. Brux. XVIII. Pt. II. 



47. 



