46 



OF THE PERIODICITY OF THE AURORA BOREALIS. 



Jan. 23. Wittenberg. Weidler. Mairan. 



" 24. Upsal Celsius and Hiorter. 



" 26. St. Petersburg. Kraft. 



" 27. St. Petersburg. Kraft. 



Feb. 2. Upsal. Celsius and Hiorter. 



" 5. Upsal. Celsius and Hiorter. 



" 7. Upsal. Celsius and Hiorter. 



" 8. Upsal. Celsius and Hiorter. 



" 9. Upsal. Celsius and Hiorter. 



" 14. St. Petersburg. Kraft. 



« 15. St. Petersburg. Kraft. 



" 16. Wittemberg. Weidler. Mairan. 



" 16. St. Petersburg. Kraft. 



" 17. Upsal. Celsius and Hiorter. 1 



" 25. Upsal. Celsius and Hiorter. 



Mar. 2 JJpsal. Celsius and Hiorter. 



" 5. Upsal. Celsius and Hiorter. 



" 6. St. Petersburg. Kraft. 



" 7. Upsal. Celsius and Hiorter. 



" 11. Upsal. Celsius and Hiorter. 9 



" 11. Mairan and Phil. Trans. 



" 12. Upsal. Celsius and Hiorter. 



" 12. St. Petersburg. Kraft. 



" 13. Upsal. Celsius and Hiorter. 



" 16. Plymouth. Huxham. Mairan and Phil. Trans. 



" 16. Cambridge. Winthrop. 



" 17. Mairan ami Phil. Train. 



" 19. Upsal. Celsius and Hiorter. 



" 20. Plymouth. Huxham. Mairan and Phil. Trans. 



" 26. Upsal. Celsius and Hiorter. 



" 30. Upsal. Celsius and Hiorter. 



Apr. 1. Plymouth. Huxham. 



" 4. Upsal. Celsius and Hiorter. 



" 6. Upsal Celsius and Hiorter. Mairan. Short 



" 6. Philadelphia. Breintnal. Kahn. 



" 6. Cambridge. Winthrop. St. Petersburg. Kraft 



" 9. Upsal. Celsius and Hiorter. 



" 10. Upsal. Celsius and Hiorter. 



" 12. St. Petersburg. Kraft. 



" 13. Upsal. Celsius and Hiorter. 



" 15. Upsal. Celsius and Hiorter. 



" 16. Upsal. Celsius and Hiorter. 



« 16. St. Petersburg. Kraft. 



" 17. Mairan and Short. 



" 18. St. Petersburg. Kraft. 



July 10. Plymouth. Huxham. 



" 23. Plymouth. Huxham. 



1 Not in Svenska Vetensk. Acad. 



2 Not in Acta Soc. Upsal. 



July 23. Upsal. Celsius and Hiorter. 



Aug. 8. Upsal. Celsius and Hiorter. 



" 9. Upsal. Celsius and Hiorter. 



" 10. Upsal. Celsius and Hiorter. 



" 10. Mairan and Short. 



" 13. Upsal. Celsius and Hiorter. 



13. Wittemberg. Weidler. Mairan and Short 



" 14. Upsal. Celsius and Hiorter. 



" 19. Upsal. Celsius and Hiorter. 



2<\ Upsal Celsius and Hiorter. 



" 21. Upsal Celsius and Hiorter. 



" 22. Upsal. Celsius and Hiorter. 



" 23. Upsal Celsius and Hiorter. 1 



" 27. Upsal Celsius and Hiorter. 1 



Sept. 4. Upsal. Celsius and Hiorter. 



" 5. Upsal. Celsius and Hiorter. 



" 6. Upsal. Celsius and Hiorter. 



" 7. Upsal. Celsius and Hiorter. 



" 8. Upsal Celsius and Hiorter. 



" 9. Upsal. Celsius and Hiorter. 



" 9. St. Petersburg. Kraft. 



" 10. Upsal. Celsius and Hiorter. 



" 10. St. Petersburg. Kraft. 



" 11. Upsal Celsius and Hiorter. 8 



15. Upsal. Celsius and Hiorter. 

 " 15. St. Petersburg. Kraft. 



" 18. St. Petersburg. Kraft. 



" 19. St. Petersburg. Kraft. 



Oct. 1. Mairan and Short. 



" 2. Upsal. Celsius and Hiorter. 



" 2. Plymouth. Huxham. Mairan and Short. 



" 3. Upsal. Celsius and Hiorter. 



" 3. Mairan and Short. 



" 4. Upsal Celsius and Hiorter. 



" 5. Upsal Celsius and Hiorter. 4 



'• 6. Cambridge. Winthrop. 



" 7. Cambridge. Winthrop. 



" 7. Upsal. Celsius and Hiorter. 6 



" 8. Upsal Celsius and Hiorter. 



" 8. Italy. Beccari. Mairan. 



" 8. Plymouth. Huxham. Cambridge. Winthrop. 



" 8. Gottingen. Hollmann. 6 



" 9. Upsal. Celsius and Hiorter. 



" 9. Italy. Beccari. St. Petersburg. Kraft. 



1 Not in Svenska Vetensk. Acad. 



2 Not in Acta Soc. Upsal. 

 8 Not in Acta Soc. Upsal. 

 * Not in Svenska Vetensk. Acad. 

 6 Not in Acta Soc. Upsal. 

 6 Coram. Gott. III. 7. 



