146 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Nov. 22. Koursk and Bogoslowski. Kupffer. 1 



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



" 25. New York. Hough. Toronto. Sabine. 



" 25. Worcester. Chandler. Makerstonn. Broun. 



•' 26. New Haven ? Herrick. Newton and Loomis. 



" 26. New Fork. Hough. Toronto. Sabine. 



" 26. Providence ? Caswell. Worcester. Chandler. 



" 26. Makerstoun. Broun. 



" 27. New York. Hough. Makerstoun. Broun. 



Dec. 1. Christiania. Hansteen. 



2. Christiania. Hansteen. 

 " 3. Christiania. Hansteen. 



4. New Haven ? Herrick. Newton and Loomis. 



" 4. Christiania. Hansteen. 



" 7. New York. Hough. 



" 8. New York. Hough. Jakobshavn. Rudolph. 



" 8. Sitka. Kupffer. Schmidt. 



" 10. Schmidt. 



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



" 16. Wurtemberg. Deniidoff. 2 Toronto. Sabine. 



" 17. New York. Hough. Toronto. Sabine. 



" 17. Brussels. Quetelet. Eutin. Schmidt. 



" 17. France. Rigault. Arago. 



" 17. Neuchatel. Coulon. 8 



•' 17. Italy. Uemidoff. Gorki. Kupffer. 4 



" 17. Yakoutsk and Sitka. Kupffer. 



" 18. Toronto. Sabine. Eutin. Schmidt. 



" 18. Yakoutsk. Kupffer. 



" 1 9. New Haven f Herrick. Newton and Loomis. 



" 19. Worcester. Chandler. Christiania. Hansteen. 



" 19. Catharinebourg. Kupffer. Eutin. Schmidt. 



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



" 20. New York. Hough. Eutin. Schmidt. 



" 20. Makerstoun. Broun. 



" 20. Zlatoouste. Kupffer. 6 Hobarton. Sabine. 



" 29. Jakobshavn. Rudolph. 



" 31. Leipsic. Carlsru/ie, Wurtemberg, fyc. Jahn. 



1848. 



3. New Haven ? Herrick. Newton and Loomis. 

 3. New York. Hough. 



Jan. 



1 Annal. de l'Observ. Phys. Centrale de Russie, 1858, Suppl. 

 p. 85. 



2 L'Institut. Sci. Math. Phys, &c. XVI. 10. 

 s Bull. Soe. Sci. Nat. Neuchatel. II. 194. 



4 Annal. de l'Observ. Phys. Centrale de Russie, 1852, Suppl. 

 p. 49. 



4 Annal. de l'Observ. Phys. Centrale de Russie, 1847, p. 387. 



Jan. 3. Kingston and Toronto. Lefroy. 1 



" 6. New York. Hough. 



" 6. London, Canada West. Lefroy. 



" 10. Jakobshavn. Rudolph. 



" 11. Neio York. Hough. 



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



" 12. Christiania. Hansteen. Yakoutsk. Kupffer. 



" 13. Christiania. Hansteen. Dunse. Stevenson. 



" 14. Coulvier-Gravier. 2 



" 15. Kingston and London. Lefroy 



" 1 6. East Hartford. Herrick. Newton and Loomis. 



" 16. New York. Hough. 



" 16. Kingston, Toronto, and London- Lefroy. 



" 17. New York. Hough. 



" 19. New York. Hough. 



" 20. Montreal. Hough. 



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



" 23. New York. Hough. Kingston. Lefroy. 



" 23. Bussio 1 Hough. 



" 24. Christiania. Hansteen. Russia! Hough. 



" 25. Russia? Hough. 



" 26. Christiania. Hansteen. 



" 27. Jakobshavn. Rudolph. 



" 28. Cambridge. Bond. Lovering. 



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



" 28. Neio York. Plough. Newberry. Johnson. 



" 28. Montreal, Kingston, and London. Lefroy. 



" 28. Bonn. Schmidt. 



" 29. Kingston. Lefroy. Yakoutsk. Kupffer. Jahn. 



Feb. 2. Jakobshavn. Rudolph. 



" 4. Neio Haven ? Herrick. Newton and Loom's. 



" 6. New Haven. Bradley. Newton and Loomis. 



" 6. Christiania. Hansteen. 



" 6. Quebec, Montreal, and Kingston. Lefroy. 



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



" 7. Neio York. Hough. Toronto. Lefroy. 



" 7. Quebec, Montreal, and Kingston. Lefroy. 



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



" 8. New York. Hough. Providence. Caswell. 



" 8. Newberry. Johnson. Toronto. Lefroy. 



" 8. Quebec, Montreal, and Kingston. Lefroy. 



" 12. Montreal. Lefroy. 



" 13. Montreal. Lefroy. 



" 14. Christiania. Hansteen. 



" 1 4. Montreal and Toronto. Lefroy. 



" 15. New York. Hough. 



" 18. New York. Hough. 



i Phil. Mag. Third Series, XXXVI. 457. 

 2 Compt. Rend. XXVIII. 89. 



