56 



ON THE PERIODICITY OF THE AURORA BOREALIS. 



Feb. 



Mar. 



Apr. 



Auj 



18. 



19. 



20. 

 8. 



17. 



18. 



22. 



28. 

 5. 



16. 



22. 

 .16. 

 " " 26. 

 " 27. 

 " 28. 

 " 29. 

 Sept. 9. 

 " 10. 

 " 11. 

 " 11. 

 " 12. 

 " 15. 

 « 16. 

 " 16. 

 " 18. 

 " 19. 

 " 20. 

 " 21. 

 " 22. 

 " 23. 

 " 24. 



13. 



15. 



31. 



31. 

 5. 

 9. 



15. 



16. 



20. 



21. 



22. 



27. 



28. 



Oct. 



Nov 



Upsal. Bergman. 



UpsaL Bergman. 



Upsal. Bergman. Rouen. Bouin. 1 Reuss. 



Cambridge. Wintbrop. Lovering. 



UpsaL Bergman. 



St. Petersburg. Braun. 2 



Upsal. 

 Upsal. 

 Upsal. 



/ 'psal. 



Upsal. 

 Upsal. 

 Upsal. 

 Upsal. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 

 Upsal or Stockholm. Bergman. 

 St. Petersburg. Braun. 

 Upsal. Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 8 

 Cambridge. "Wintbrop. Lovering. 

 Upsal. Bergman. 

 I psal. Bergman. 

 Cambridge. Winthrop. Lovering. 

 Upsal. Bergman. 

 Upsal. Bergman. 



Upsal. Bergman. Rouen. Bouin. Reuss. 4 

 North Germany. Hartmann. Boue. 6 

 Cambridge. Wintbrop. Lovering. 

 Upsal. Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 6 

 St. Petersburg. Braun. 

 Cambridge. Wintbrop. Lovering. 

 Upsal. Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman. 



Bergman.' 



Upsal. 

 Upsal. 

 I psal. 

 Upsal. 

 Upsal. 

 I psal 

 Upsal. 



Upsal. 

 Upsal. 

 Upsal. 

 Upsal. 

 Upsal. 

 Upsal. 

 Upsal. 

 Upsal. 



1 Mem. de l'Acad. Sav. Etrang. V. 103. 



2 N. Comm. Petrop. X. 367. 



8 This is in Phil. Trans, bat not in Nova Acta Sei. Upsal. 



* Mem. de l'Acad. Sav. Etrang. VI. 253. 



& Hamb. Mag. XXIV. 157. 



6 This is in Phil. Trans, but not in Nova Acta Sci. Upsal. 



' This is in Nova Acta Sci. Upsal, but not in Phil. Trans. 



Dec. 9. 



" 10. 



" 11. 



" 12. 



" 13. 



" 14. 



" 15. 



" 16. 



" 17. 



" 19. 



" 21. 



" 25. 



Jan. 10. 



" 12. 



" 13. 



" 17. 



" 18. 



" 23. 

 Feb. 8. 



" 11. 



" 12. 



" 14. 



" 18. 



« 19. 



" 20. 



« 21. 



" 22. 



Mar. 5. 



6. 



" 12. 



" 14. 



" 16. 



" 28. 

 Apr. 2. 



" 3. 



" 6. 



" 8. 



» 9. 



" 10. 



" 11. 



" 12. 



" 14. 



" 16. 



" 18. 



" 23. 

 May 3. 

 July 20. 

 Aug. 14. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. St. Petersburg. Braun. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. St. Petersburg. Braun. 



Upsal. Bergman. 



I psal Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. St. Petersburg. Braun. 



1760. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Stockholm. Bergman. St. Petersburg. Braun. 



Stockholm. Bergman. 



Stockholm. Bergman. 



Stockholm. Bergman. 



Stockholm. Bergman. 



Stockholm. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Upsal. Bergman. 



Cambridge. Wintbrop. Lovering. 



I psal. Bergman. 



Upsal. Bergman. 



St. Petersburg. Braun. 



Upsal. Bergman. 



Upsal? Bergman. 



St. Petersburg. Braun. Upsal? Bergman. 



St. Petersburg. Braun. 



Upsal. Bergman. 



Upsal. Bergman. 



St. Petersburg. Braun. 



Upsal. Bergman. 



Upsal? Bergman. 



St. Petersburg. Braun. 



St. Petersburg. Braun. 



Cambridge. "Wintbrop. Lovering. 



Between Upsal and Arbogam. Bergman. 



St. Petersburg. Braun. 



