ON THE PERIODICITY OF THE AURORA BOREALI8. 



173 



Cambridge. Bond. Lovering. 



Newberry. Johnson. 



Worcester. Bemis. 



Kreaznach, Prussia. Bohm. 



Worcester. Bemis. 



Cambridge. Bond. Lovering. 



Hammerfest. Noodt. 



Haparanda. Bohm. 



Cambridge. Bond. Lovering. 



Worcester. Bemis. 



Z/atoouste. Kupffer. 



Hammerfest. Noodt. 



Hammerfest. Noodt. 



Minister. Heis. Peckeloh. Bohm. 



Hammerfest. Noodt. 



Catharineboiirg. Ku pfFer. 



St. Petersburg. Kupffer. 



Worcester. Bemis. 



( 'afharinebourg. Kupffer. 



Hammerfest. Noodt. 



1861. 

 Hammerfest. Noodt. 

 Z/atoouste. Kupffer. 

 Worcester. Bemis. 1 

 Cambridge. Bond. Lovering. 

 Cambridge. Bond. Lovering. 

 Minister and Peckeloh. Heis. Dorpat. B6hm. : 

 Lode. Kopp. 8 Elberfeld. Bohm. 

 Cambridge. Bond. Lovering. 

 Worcester. Bemis. 

 Peckeloh. Heis. 

 Hammerfest. Noodt. 

 Prague. Bohm. 

 Hammerfest. Noodt. 

 Hammerfest. Noodt. 

 Cambridge. Bond. 

 Worcester. Bemis. 



Lovering. 



Newbe 



ewberry 



Rochester. Dewey. 4 Prague. 

 Rochester. Dewey. 

 Haparanda. Bohm. 

 Peckeloh. Bohm. 

 Athens. Heis. 5 

 Rochester. Dewey. 

 Cambridge. Bund 

 Neuchatel. Kopp. 



Johnson. 

 Bohm. 



Hammerfest. Noodt. 

 Lovering. 

 Brussels. Quetelet. 6 



Mar. 9. 

 " 9. 

 " 9. 



9. 

 " 11. 

 " 13. 

 " 14. 



" 17. 



" 19. 



" 25. 



" 26. 



" 28. 



Apr. 7. 



" 11. 



" 15. 



" 15. 



June 12. 



Aug. 1. 



" 5. 



" 22. 



Sept. 8. 



" 15. 



Oct. 10. 



" 24. 



" 25. 



" 27. 



Nov. 5. 



" 7. 



1. 



4. 



5. 



18. 



19. 



29. 



Jan. 1. 

 2. 



" 31. 

 Feb. 1. 



" 2. 



" 7. 



" 28. 

 Mar. 1. 



i Twenty-ninth Report of the Lunatic Asylum, p. 61. 



' Magnet, und Meteor. Beobacht. zn Prag.XXII. Jahr. p. xn. 



8 Bull. Soc. Sei. Nat. Neuchatel. VI. 2.37. 



4 Reports of Regents of the Univ. New York, 1862, pp. 412,421. 



<• Bull, de l'Acad. Brux. XI. 317 et 644. 



Dec. 



St. Petersburg. Kupffer. 1 Munster. 



Haparanda and Stockholm. Bohm. 



Greenwich. Paris. Cracoto. Bohm. 



Prague. Berlin. Dorpat. Bohm. 



Neivberry. Johnson. 



Stockholm. Bohm. 



Stockholm. Bohm. 



Haparanda. Bohm. 



Jicin. Bohm. 



Stockholm and Prague. Bol.m. 



Stockholm. Bohm. 



Newberry. Johnson. 



Sitka. Kupffer. 2 



Newberry. Johnson. 



Ihijinranda and Munster. Bohm. 



Peckeloh and Berlin. Bohm. 



Worcester. Bemis. 



Rochester. Dewey. • 



Cambridge, Bond. 



Near Lake Superior. 



Worcester. Bemis. 



Worcester. Bemis. 



Newberry. Johnson. 



Worcester. Bemis. 



Newberry. Johnson. 



Neioberry. Johnson. 



Peckeloh. Bohm. 



Lichtenberg, Peckeloh, fyc. Bohm. 



Christiania. Hansteen.* 



Stockholm. Peckeloh. Bohm. 



Christiania. Hansteen. 



Ch ristiania. Hansteen. 



Christiania. Dorpat. Dresden. Bohm. 



Haparanda. Ballot. 4 



Heis. 



Lovering. 

 Sand. Rive. 8 



Newberry. Johnson. 

 Rochester. Dewey. 



Christiania. 

 Haparanda. 



Stockholm. 



Christiania. 



Christiania. 



Stockholm. 



Christiania. 



Stockholm. 



Haparanda. 



1862. 



Ballot. 



Ballot. 

 Ballot. 4 



Hansteen. 



Hansteen. 

 Ballot. 



Hansteen. 

 Ballot. 



Ballot. 



1 Annal. de 1'Observ. Phys. Ocntrale do Russie, 18G1, pp 

 et 537. 



2 Annal. de 1'Observ. Phys. Centralo de Russie, 1801, p. 4. r )5 

 s Mem. de la Soc. de Phys. Geneva, XVI. 330. 



4 Nederlandsch. Meteorol Jaarboek. 1862, p. 319. 



45 



