172 



ON THE PERIODICITY OF TIIE AURORA BOREALIS. 



Dec. 13. Cqtharinebourg. Zlatoovste. Kupffer. 



" 14. Cambridge. Bond. Lovering. Sitka. Kupffer. 



" 15. Marquette, Lake Superior. Dewey. 1 



" 15. Mammerfest. Noodt. 



" 16. Hammerfest. Noodt. 



" 21. Hatnmerfest. Noodt. 



" 23. Hammerfest. Noodt. 



" 26. Newberry. Johnson. 



" 30. Hammerfest. Noodt. 



1860. 



Jan. 14. Haparanda, Sweden. Bohm. 2 



•' 15. Cambridge. Bond. Lovering. Dorpal. Bohm. 



" 20. Hammerfest. Noodt. 



" 21. Haparanda. Bohm. Hammerfest. Noodt. 



" 22. Haparanda. Bohm. 



Full. 10. Bogoslowski. Kupffer. 8 Hammerfest. Noodt. 



" 11. Haparanda. Bohm. 



" 42. Haparanda. Peckeloh. Bohm. 



" 17. Newberry. Johnson. 



" 21. Worcester. Bemis. 



" 21. Newberry. Johnson. Providence. Caswell. 



" 22. Stockholm. St. Petersburg. Reval. Bohm. 



Mar. 10. Zlatoouste. Kii[.tfV_-r. 3 



" 12. Bogoslowshi. Kupffer. Haparanda. Bohm. 



" 12. Copenhagen. Stockholm. Bohm. 



" 13. Haparanda. Bohm. 



" 14. Newberry. Johnson. Sitka. Kupffer.' 



" 16. Sitka. Kupffer. 



" 1 7. Worcester. Bemis. Newberry. Johnson. 



" 18. Worcester. Bemis. 



" 18. Newberry. Johnson. Bogoslowski. Kupffer. 



" 19. Worcester. Bemis. 



" 20. Bogoslowski. Kupffer. 



" 24. Cuba. Bohm. 



" 26. Worcester. Bemis. Providence. Caswell. 



" 27. Cambridge. Bond. Lovering. 



" 27. Worcester. Bemis. 



" 28. Bogoslowski. Kupffer. 



" 29. ( 'iiiliiirinibourg 3 and Bogoslowski. Kupffer. 



" 29. Stockholm. Bohm. 



Apr. 9. Newberry. Johnson. 4 Bogoslowski. Kupffer. 



" 9. Copenhagen. Paris. Dorpat. Bohm. 



" 12. Worcester. b Bemis. 



" 12. Hamburg and Haparanda. Bohm. 



1 Reports of Regents of Univ. New York, 18C0, p. 229. 



2 Magnet, and Meteor. Bcobaeht. zu Prng. XXI. Jahr. p. ix. 



8 Annal. de I'Observ. Phys. Centrale de Russie, I860, pp. 131 

 385, 505, et 539. 



' Reports of Regents of Univ. New York, 1863, p. 415. 

 6 Twenty-eighth Report of the Lnnatie Asylum, p. 68. 



Cambridge. Bond. Lovering. Worcester. Bemis. 

 Ni wberry. Johnson. Providence. Caswell. 

 Hamburg and Haparanda. Bohm. 

 Cambridge. Bond. Lovering. 

 Worcester. Bemis. 

 Worcester. Bemis. 

 St. Petersburg. Kupffer. 1 

 Lougan. Kupffer. 2 

 Worcester. Bemis. 

 Sacramento, Cal. Logan. 8 

 Newberry. Johnson. 

 Cambridge. Bond. Lovering. 

 Worcester. Bemis. Newberry. Johnson. 

 Worcester. Bemis. 

 Prague. Vienna. Berlin. Bohm. 

 Chicago, Illinois. Bradley. 8 

 Naugard and Athens. Bohm. 

 Zlatoouste and Lougan. Kupffer. 

 New Haven. Herrick. 4 

 Prussia. I'm, ice. Greece. Ileis. 6 Bohm. 

 New Haven. Herrick. Chicago. Bradley. 

 Paris, rleis. Norderney. Bohm. 

 St. Petersburg. Kupffer. 

 Prague and Peckeloh. Bohm. 

 Chicago. Bradley. Bogoslowski. Kupffer. 

 Prague. Ileis. Cutharinebourg. Kupffer. 

 J'mis. Kremsmunster, fyc. Bohm. 

 Emden mid Westphalia. Ileis. Bohm. 

 Athens. Ileis. Bohm. 

 Worcester. Bemis. Newberry. Johnson. 

 Chicago, Illinois. Bradley. 

 Worcester. Bemis. Stockholm. Bohm. 

 Newberry. Johnson. 6 

 Westphalia. Bohm. 

 Westphalia. Bohm. 

 Gouda, Netherlands. Bohm. 

 ( 'ambridgc. Bond. Lovering. 

 Worcester. Bemis. Newberry. Johnson. 

 Utrecht, Stockholm, Peckeloh. Bohm. 

 New Haven. Herrick. 7 Sitka. Kupffer. 

 Stockholm and Leipsic. Bohm. 

 Peckeloh. Bohm. 

 Stockholm inn/ Haparanda. Bohm. 

 Worcester. Bemis. 



1 Annal. de I'Observ. Phys. Centrale de Russie, 1860, p. 49 



2 Annal. de I'Observ. Phys. Centrale de Russie, 1860, p. 573. 



5 Amer. Jour. Sci. Second Series, XXXI. 136, and XXXII. 148. 

 • Amer. Jour. Sci. Second Strii s, XXX. 298. 



6 Bull, de l'Acad. Brux. X. 417 et 422. 



6 Aurora Australia. 



7 Bull, de l'Acad. Brux. Second Series, X. 420. 



