150 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Nov. 4. 



Lefroy. 

 Lefroy. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Fort Cbw/Wenee.Richardson. T'oeWsA-.Kupffer. 1 



Toronto. Lefroy. Tobolsk. Kupffer. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Fort Confidence. Richardson. 



Cracow. Boue. 2 



New Haven. Herrick. Newton and Loomis. 



Fort Confidence. Richardson. 



Toronto. Lefroy. 



Toronto. Lefroy. Christiania. Hansteen. 



Cambridge. Bond. Lovering. 



New Haven. Herrick. Newton and Loomis. 8 



Maine. Herrick. Newton and Loomis. 



New York. Hough. Newberry. Johnson. 



Toronto, Montreal, and Kingston. 



Quebec, London, Penetanguishene. 



Fort Confidence. Richardson. 



California. Cuba. Poey. 4 



Prestwich. Sturgeon. Northampton. Watkins. 5 



Brussels. Quetelet. Arago. Gorki. Kupffer. 



Makerstoun. Broun. Dunse. Stevenson. 



Aix-la-Chapelle. Heis. Alsen. Brorsen. Jahn. 



Italy, Greece, Asia. Spain. Rico. 



Bamaoul and Lougan. Kupffer. 



Catharinebourg and Koursk. Kupffer. 6 



Bogoslowski and Lougan. Kupffer. 



New Haven. Herrick. Newton and Loomis. 



Worcester. Chandler. New York. Hough. 



Quebec and Toronto. Lefroy. 



Fort Confidence. Richardson. 



Makerstoun. Broun. 



Aix-la-Chapelle. Heis. Jahn. 



New Haven. Herrick. Newton and Loomis. 



Quebec and Toronto. Lefroy. 



Yakoutsk. Kupffer. 



Christiania. Hansteen. Schmidt. 



Hobarton, V. D. Land. Sahine. 

 Fort Confidence. Richardson. 



i Annal. de l'Observ. Phys. Centrale de Russie, 1859, Suppl. 

 p. 170. 



« Kreil's Jahrbueh fur Prag. I. 312. 



8 Amer. Journ. Sci. Second Series, VII. 127. 



4 Amer. Journ. Sci. Second Series. VII. 127. 



6 Phil. Mag. Third Series, XXXV. 69. 



6 Annal. de 1'ObserT. Phys. Centrale de Russie, 184S, pp. 147, 

 813, 517 and 581. 



Nov. 21. Cambridge. Bond. Lovering. 



" 21. Worcester. Chandler. Providence. Caswell. 



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



" 21. New York. Hough. Yakoutsk. Kupffer. 



" 21. Toronto and London, C. W. Lefroy. 



" 21. Fort Confidence. Richardson. 



" 21. Makerstoun. Broun. Dunse. Stevenson. 



" 21. Brussels. Quetelet. Prestwich. Sturgeon. 



" 21. Aix-la-Chapelle. Heis. Schmidt. Jahn. 



" 22. Cambridge. Bond. Lovering. 



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



" 22. Quebec and Toronto. Lefroy. 



" 22. Aix-la-Chapelle. Heis. Schmidt. Jahn. 



" 22. Makerstoun. Broun. Russia ? Hough. 



" 22. Jakobshavn. Rudolph. 



" 23. Neic Haven. Herrick. Newton and Loomis. 



" 23. New York. Hough. 



" 23. Quebec and Kingston. Lefroy. 



" 23. Toronto and Penetanguishene. Lefroy. 



" 24. Christiania. Hansteen. 



" 24. Fort Confidence. Richardson. 



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



" 25. Toronto? Lefroy. Tobolsk. Kupffer. 



" 25. Fort Confidence. Richardson. 



" 25. Jakobshavn. Rudolph. 



" 26. Neiv Haven. Herrick. Newton and Loomis. 



" 26. Providence. Caswell. New York. Hough. 



" 26. Kingston, Toronto, and London. Lefroy. 



" 26. Newfoundland and Quebec. Lefroy. 



" 26. Fort Confidence. Richardson. 



" 26. Jakobshavn. Rudolph. 



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



" 27. New York. Hough. 



" 27. Newfoundland and Toronto. Lefroy. 



" 27. Fort Confidence. Richardson. 



" 27. Christiania. Hansteen. 



" 28. Worcester. Chandler. 



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



" 28. Fort Confidence. Richardson. 



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



" 29. Fort Confidence. Richardson. 



" 30. Montreal. Lefroy. Makerstoun. Broun. 



" 30. Fort Confidence. Richardson. 



Dec. 1. New Haven. Herrick. Newton and Loomis. 



" 1. Fort Confidence. Richardson. 



" 2. Newfoundland. Lefroy. 



" 2. Fort Confidence. Richardson. 



" 3. Fort Confidence. Richardson. 



" 3. Jakobshavn. Rudolph. 



