OF THE PERIODICITY OF THE AURORA BOREALIS. 



43 



Jan. 



Feb. 



Mar, 



15. 

 19. 

 20. 

 21. 

 22. 

 24. 

 29. 

 30. 

 31. 



1. 



2. 



3. 



5. 

 22. 

 23. 

 27. 

 28. 



2. 



3. 



6. 

 18. 

 21. 

 28. 

 28. 

 29. 

 29. 



3. 



4. 



6. 



7. 



" 10. 



" 11. 



" 22. 



« 24. 

 June 3. 



" 30. 

 Aug. 20. 



" 20. 



" 21. 



" 21. 



" 21. 



" 22. 



" 22. 



" 23. 



" 23. 



" 23. 



Apr. 



Tornea. Celsius. 



Tornea. Celsius. 



Vpsal. Wallerius. Lincopia. Sparschuch. 1 



Tornea. Celsius. 



Upsal. "Wallerius. Tornea. Celsius 



Italy. Beccari. Mairan. 



Upsal. Wallerius. Tornea. Celsius. 



Lincopia. Sparscbucb. 



Lincopia. Sparscbucb. Tornea. Celsius. 



Lincopia. Sparscbucb. 



Tornea. Celsius. 



Tornea. Celsius. 



Tornea. Celsius. 



Kiemi. Celsius. 



Kiemi. Celsius. 



Tornea. Celsius. 



Upsal. Wallerius. 



Tornea. Celsius. 



Tornea. Celsius. 



Tornea. Celsius. 



Plymouth. Huxbara. Mairan and Sbort. 



Mairan, Sbort, and Phil. Trans. 



St. Petersburg. Kraft. The Delisles. Mairan. 2 



Wittemherg. Weidler. Mairan. 



Plymouth. Huxham. Short. 



Wittemherg. Weidler. Mairan. 



Mt. Kittis. Celsius. 



Mt. Kittis. Celsius. 



Jit. Kittis. Celsius. 



Mt. Kittis. Celsius. 



Wittemherg. Weidler. 



St. Petersburg. Kraft. 



St. Petersburg. Kraft. 



Tornea. Celsius. 



St. Petersburg. Kraft. The Delisles. Mairan. 



Italy. Beccari. Mairan. 



Italy. Beccari. Mairan. 



Plymouth. Huxham. Phil. Trans. 



Wittemherg. Weidler. Mairan and Short. 



Italy. Beccari. Plymouth. Huxham. Short. 



Wittemherg. Weidler. 



Mairan and Phil. Trans. 



Plymouth. Huxham. Mairan and Short. 



Philadelphia, $c. Kahn. 3 Phil. Trans. 



Plymouth. Huxham. Wittemherg. Weidler. 



St. Petersburg. Kraft. The Delisles. 



Mairan, Short, and Phil. Trans. 



Mairan. 

 The Delisles. Mairan. 

 The Delisles. Mairan. 



1 Acta Lit. Sueciffi, IV. 437. 



2 Comm. Petrop. IX. 359. 

 8 Penn. Gazette. 



Aug. 24. St. Petersburg. Kraft. The Delisles. Mairan. 



" 25. Italy. Beccari. Mairan. 



" 25. St. Petersburg. Kraft. The Delisles. 



Sept. 4. St. Petersburg. Kraft. The Delisles. Mairan. 



" 14. Mairan and Phil. Trans. 



" 18. St. Petersburg. Kraft. The Delisles. Mairan. 



" 22. lincopia;. Sparscbuch. Frobes and Mairan. 



" 24. Lincopice. Sparscbuch. 



" 27. Mairan, Short, and Phil. Trans. 



" 28. Lincopia. Sparschuch. Mairan. 



" 28. Phil. Trans, and Short. 



" 30. Mairan, Short, and Phil. Trans. 



Oct. 1. Mairan, Short, and Phil. Trans. 



" 2. Mairan and Phil. Trans. 



" 23. St'. Petersburg. Kraft. The Delisles. Mairan. 



" 24. Mairan and Phil. Trans. 



" 25. Mairan and Phil. Trans. 



" 26. Mairan. 4 Boue. 



Nov. 6. Lincopia. Sparscbuch. 



" 11. Lincopia. Sparschuch. 



" 12. Lincopia. Sparschuch. Plymouth. Huxham. 



" 18. Plymouth. Huxham. 



" 26. Wittemherg. Weidler. Mairan. 



" 30. Mairan and Phil. Trans. 



Dec. 12. Lincopia. Sparschuch. 



" 16. Bologna. Zauotti and Beccari. 1 



" 16. Plymouth. Huxham. Wittemherg. Weidler. 



" 16. Frobes, Mairan, Thompson, and Phil. Tran-. 



" 19. Montpelier. Plantade. Siberia. Gmelin.- 



" 20. Mairan and Phil. Trans. 



" 21. Italy. Beccari. Mairan. 



" 22. Italy. Beccari. Mairan. 



" 28. Italy. Beccari. Frobes and Mairan. 



1738. 



Jan. 25. Plymouth. Huxham. 



Feb. 12. St. Petersburg. Kraft. 8 



" 16. Italy. Beccari. Mairan. 



" 19. Mairan and Short. 



Mar. 8. Lincopia. Sparscbucb. Mairan. 4 



" 18. Mairan, Short, and Phil. Trans. 



" 19. Mairan. 4 



" 21. Lincopia. Sparschuch. 



Apr. 1 0. Mairan, Short, and Phil. Trans. 



" 16. Plymouth. Huxham. 



July 11. Italy. Beccari. Mairan. 



1 Comm. Bonon. II. Pt. I. 476. 



2 Comm. Petrop. XI. 252. 8 Ibid. XI. 244. 



4 Mairan gives an aurora on these dates in his general cata- 

 logue (Traite', p. 545), but not iu any special one. 



