174 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



1863. 

 Jan. 25. Christiania. Hansteen. 



1 Reports of Regents of the Univ. New York, 1863, p. 415. 



2 Thirtieth Report of the Lunatic Asylum, p. 110. 



3 Corr. Annuell. des Mine9 de Russie, 1860, p. xxvm. 



4 Bull. Soc. Sci. Nat. Neuchatel. VI. 279. 



s Annuaire de l'Obscrv. Royal de Brux. 1SG4, p. 200. 

 6 Thirty-first Report of the Lunatic Asylum, p. 68. 



Jan. 26. 



" 28. 

 Feb. 7. 



" 8. 



•• 22. 



" 23. 



" 24. 



" 25. 



" 26. 

 Mar. 21. 



" 22. 



" 24. 

 Apr. 9. 



" 9. 



" 9. 



'• 15. 



" 16. 



" 17. 



" 19. 



" 21. 



" 21. 



" 24. 

 May 8. 

 Aug. 14. 

 Sept. 9. 



" 23. 



" 24. 



" 25. 

 Oct. 5. 



" 7. 

 9. 



" 10. 



•• 17. 



" 20. 

 Nov. 5. 



•• 13. 



" 14. 



June 7. 

 Aug. 14. 



Sept. 20. 

 Nov. 19. 



Christiania. Hansteen. 

 Christiania. Hansteen. 

 Cltristiania. Hansteen. 

 Worcester. Bemis. Christiania. Hansteen. 

 Christiania. Hansteen. Stockholm. Ballot. 1 

 t 'hristiania. Hansteen. 

 Christiania. Hansteen. 

 Christiania. Hansteen. Stockholm. Ballot 

 Christiania. Hansteen. 

 Christiania. Hansteen. 

 Worcester. Bemis. Christiania. Hansteen- 

 Christiania. Hansteen. 

 Worcester. Bemis. New Haven. 3 

 Newburypvrt. Mass. Perkins. 

 < 'hristiania. Hansteen. Stockholm. Ballot. 

 Christiania. Hansteen. 

 Christiania. Hansteen. 

 C 'h ristiania. Hansteen. 

 Worcester. Bemis. 

 Worcester. Bemis. 



Christiania. Hansteen. Munster. Heis. 

 Christiania. Hansteen. 

 Worcester. Bemis. 

 Christiania. Hansteen. 

 Worcester. Bemis. 

 Worcester. Bemis. 

 Christiania. Hansteen. 

 Christiania. Hansteen. 

 Haparanda. Ballot. 

 Christiania. Hansteen. 

 Haparanda. Ballot. 

 Christiania. Hansteen. 

 ( 'hristiania. Hansteen. 

 < hristiania. Hansteen. 

 Christiania. Hansteen. 

 Christiania. Hansteen. 

 Christiania. Hansteen. 



1864. 



Cambridge. Lovering. 

 Campton, New Hampshire. Lovering. 

 Cambridge. Bond. Lovering. 

 Cambridge. Lovering. 



1 Nedcrlandsch. Meteorol. Jaarboek. 1863, p. 319. 



2 Amer. Journ. Sci. Second Series, XXXV. 462. 



