42 



OF THE PERIODICITY OF THE AURORA BOREALIP. 



Apr. 5. 

 •• 14. 

 « 14. 

 " 14. 

 May 4. 

 July 7. 

 " 8. 

 Aug. 13. 

 •• 15. 

 " 20. 

 " 25. 

 " 29. 

 Sept. 3. 

 I. 

 " 4. 

 " 5. 

 " 5. 

 " 9. 

 " 13. 

 " 17. 

 " 24. 

 " 25. 

 " 25. 

 " 26. 

 " 27. 

 " 29. 

 " 29- 

 " 30. 

 1. 

 2. 

 3. 

 4. 

 5. 

 C. 

 7- 

 7. 

 7. 

 7. 

 8. 

 8. 

 10. 

 20. 

 22. 

 24. 

 25. 

 26. 



Oct, 



Wittemberg. Weidler. Mairan. 

 St. Petersburg. The Delisles. 

 Lincopia. Sparschuch. London. Celsius. 

 Mairan and Phil. Trans. 

 Italy. Beceari. Mairan. 

 Italy. Beceari. Mairan. 

 Italy. Beceari. Mairan. 

 St. Petersburg. Kraft. The Delisles. Mairan. 

 St. Petersburg. The Delisles. Mairan. 

 St. Petersburg. The Delisles. Mairan. 

 Plymouth. Huxham. 

 Plymouth. Huxham. 

 Wittemberg. Weidler. Mairan. 

 Wittemherg. "Weidler. Mairan. 

 Lincopia. Sparschuch. 

 St. Petersburg. Kraft. The Delisles. Mairan. 

 Plymouth. Huxham. Phil. Trans. 

 Plymouth. Huxham. 

 <Sl!. Petersburg. The Delisles. Mairan. 

 Upsal. Wallerins. 1 

 UpsaL Wallerins. 

 Upsal. Wallerins. Phil. Trans. 

 Italy. Beceari. Mairan and Short. 

 St. Petersburg. Kraft. The Delisles. Mairan. 

 Upsal. Wallerius. 

 Lincopia. Sparschuch. 

 30. Upsal. Wallerius. 

 Italy. Beceari. Mairan. 

 Upsal. Wallerins. Jit. Kittis. Celsius. 2 

 Mt. Kittis. Celsius. 



Jit. Kittis. Celsius. 

 Jit. KittU. Celsius. 

 Upsal. Wallerius. 



Upsal. Wallerius. 



Oct. 26. 



" 27. 



" 27. 



" 28. 



" 28. 



« 29. 



" 29. 



" 30. 

 Nov. 7. 



" 8. 

 9. 



" 17. 



« 18. 



" 19. 



" 19. 



" 24. 



" 24. 



'• 25. 



" x. 

 Dec. 1. 



« 3. 



'• 10. 



" 12. 



" 18. 



" 18. 



" 19. 



" 22. 



" 22. 



" 23. 



" 24. 



" 25. 



" 31. 



Jit. Kittis. 

 >. Upsal. 

 Mi. Kittis 

 Lincopia. 

 Plymouth. 

 Plymouth. 

 Jit. Kittis. 

 Wittemberg. 



Celsius. 



Wallerius. 



Celsius. Mairan 

 Sparschuch. 



Huxham. 



Huxham. 



Celsius. 

 Weidler, 



Short. 

 Short. 

 Mairan. 

 Mairan. 



Upsal. Wallerius. 

 Frobes and Mairan. 

 Upsal. Wallerius. 

 Lincopia. Sparschuch. 

 Wittemberg. Weidler. 



Jan. 



Tremblay. Du Fay. 3 

 Frobes and Mairan. 



Lincopia. Sparschuch. 

 Wittemberg. Weidler. 

 Frobes, Mairan, and Phil. Trans. 

 Upsal. Wallerius. Mt. Kittis. Celsius. 

 Frobes, Mairan, and Phil. Trans. 

 Mt. Kittis. Celsius. 

 Frobes, Mairan, and Phil. Trans. 

 Frobes and Mairan. 



Plymouth. Huxham. Mairan and Short 

 Mairan and Short. 

 Mairan and Short. 



St. Petersburg. Kraft. The Delisles. Mairan. 

 Plymouth. Huxham. Mairan and Short. 

 St. Petersburg. The Delisles. Mairan. 

 Plymouth. Huxham. Short. 

 I'll/month. Huxham. Lincopia. Sparschuch. 

 Edinburg. Short. 1 Frobes and Mairan. 

 Lincopia. Sparschuch. 

 Mairan. 



Si. Petersburg. Kraft. The Delisles. Mairan. 

 / ),s<il. Wallerins. Mt. Kittis. Celsius. 

 J/'. Kittis. Celsius. 

 Tornea. Celsius. 

 Oftcer- Tornea. Maupertius. 2 

 Upsal. Wallerius. 

 Tornea. Celsius. 



Celsius. Thompson. 

 De Fouehy. Boue. 



Tornea. 



Paris. 



Tornea. 



Tornea. 



Tornea. 



Tornea. 



Celsius. 

 CeL-ius. 

 Celsius. 

 Celsius. 



1737. 



Italy. Beceari. Tornea. Celsius. Mairan. 

 Tornea. Celsius. 



Sit. Petersburg. The Delisles. Mairan. 

 Tornea. Celsius. 



Mairan. Phil. Tran? 



1 Acta Lit. Sueciie, IV. 220. 

 - Acta Lit. Suecia:, IV. 254. 

 8 Mem. de l'Acad. 1736, p. 505. 



Tornea. Celsius. 



Tornea. Celsius. 



Tornea. Celsius. 

 " 9. Tornea. Celsius. 

 " 9. Salem. Holyoke." 

 " 9. Philadelphia. Breintnal. 4 Kahn. 

 " 12. Tornea. Celsius. 

 " 13. Upsal. Wallerius. Tornea. Celsius. 



1 Phil. Trans. XLI. Pt. I. 368. 



2 Oeuvres, III. 157. 



3 Felfs Salem, II. 137. 



1 Phil. Trans., XLI. Pt. I. 359. 



