ON THE PERIODICITY OF THE AURORA BOREALIS. 



251 



1779. April 





1780. 



-17S1. 



L782. 

 *178a 



17S4. 



1785. 

 *178G. 



it 



♦17S7. 



* ii 



* a 



* ii 

 *17S8. 



May 

 July 



3. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 17. 

 17. 

 18. 

 20. 

 15. 



Beguelin. 



30. 

 12. 



Aug. 

 Dec. 



Jan. 

 Feb. 



April 25. 



.Tune 6. 



Aug. 26. 



April 9. 

 March 29. 



May 12. 



•■ 17. 



" 22. 



July 25. 



••' 25. 



Nov. 15. 

 March 3. 



•• 23. 



July 13. 



May 13. 



July 13. 



Oct. 31. 



Nov. 8. 



Sept 2. 



Wolf. 1 



Wolf. 



Wolf. a 



Wolf. 



Wolf. 



Wolf. 



Berlin. 



Berlin. Beguelin. 

 Berlin. Beguelin. 

 Berlin. Beguelin. 



Berlin. Beguelin. 



Berlin. Beguelin. 



Ratisbon. Heinrich. Wolf. 



Berlin. Beguelin. Wolf. 



Wolf. 8 



Montmorenei. Cotte. 4 



Wolf. 



Ratisbon ? Heinrich. 



Wolf. 



Welt'. 5 



Wolf. 



Montmorenei. Cotte. Wolf. 8 

 Ratisbon. Heinrich. 

 Ratisbon. Heinrich 



Wolf." 

 New York} 



Paris. Cassini. Wolf. 9 

 Pari*. Cassini. 

 Paris. Cassini. Wolf. 

 Paris. Cassini. 

 Geneva. Cotte. 10 

 Paris. Cassini. 



Vienna. Pilgram. 

 Switzerland ? Vogel. Wolf. 

 Paris. Cassini. Wolf. 11 



Vienna and Lami. 12 



Vienna and Loon. 



Paris. Bouvard. 11 



' ten and Laon. 



Bi me. Studer. 14 



178S. Oct. 13. 



*1790. Jan. 29. 



" Feb. 4. 



ii ii 24. 



March 8. 



May 17. 



June 4. 



July 16. 



Sept. 30. 



Jan. G. 



Aug. 8. 



Dec. 26. 



Nov. 19. 



March 4. 



*1794. April 30. 



" Dec. 7. 



* " S. 



16. 



17. 



20. 



24. 

 4. 



* ii 



* ii 

 ii 



* ii 



* ii 



*1791. 



ii 



* ii 

 1792. 

 1793. 



1795. Oct. 



Paris. 

 Paris. 



Paris. 

 Paris. 



Paris. 



Paris. 



Paris. 



J 'a, -is. 



Paris. 



I 'arts. 



Paris. 

 Paris. 

 Kendal. 



i Nout. Mem. ile L'Acad. Berlin. ITT'.', p. 106. 



* The auroras of April 7 ami 8 are found only in Bode': 

 Astronomisch. Jahrbuch fur 17-7. 



* Scliweiz. Mon. Nachr., 1780. 



* Journ. iles. Savaus, 1781, p. 180. 

 - Sehweiz. Mon. Nachr., 1781. 



« Connaiss. de Toms., 1785, p. 892 



' Sehweiz. Mon. Nachr., 1782. 



» Journ. «lcs. Savana , 1781, p. 180. 



' Connaiss. de Terns., L788, ]). 337. 



'"Journ. de Physique, XI. 111. i ...:. 



" Connaiss. de Terns.. 1790, p. 370 



•-'Journ. ile Physique, I.XV. 255. 



i Connaiss. de Terns., 1791, p. 360 



h Mittheil. Naturforsch. Gesellsch. Bern, 1855, p. 43. 



1796. 

 1797. 

 1799. 



LSdO. 



May 

 Dec. 

 July 

 Sept. 

 March 18. 

 Amr. 15. 



1801. 



1802. 



*1803. 



1S06. 



1807. 



June 



Sept. 



Nov. 



Jan. 



Bouvard. 



Bouvard. 2 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



Bouvard. 



' Dalton. 



Wolf. 1 



Wolf. 



Wolf. 



Wolf. 



Wolf. 8 



Wolf. 



Wolf. 



Wolf. 4 



Wolf. 

 Wolf. 6 



Paris. Bouvard. 6 

 Paris. Bouvard. 7 

 Paris. Bouvard. Wolf. 8 

 Paris. Bouvard. 9 

 Paris. Bouvard. Wolf. 10 

 Paris. Bouvard. Wolf. 

 Paris. Bouvard. 11 



Manchester. Dalton. Wolf. 12 



Paris. Wolf. 13 

 Pafis. Wolf. 14 



Manchester. Dalton. Wolf. 



Paris. Bouvard. 15 

 18. Paris. Bouvard. 



18. Manchester. Dalton. Wolf. 

 3. Ratisbon. Heinrich. 



19. Near the Naze, Norway. Wolf. 14 

 30. Switzerland. Vogel. Wolf. 

 26. Wolf." 



1 Connaiss. de Terns., 17'.i_. p. 356. 

 - Connaiss. de Terns., 1793, p. 375. 

 3 Connaiss.de Terns., 17'.i3, p. 376. 

 * Connaiss. de Terns.. 1794, pp. 284, 285. 

 s This is the same aurora which is put erroneously on Not. 

 29 in my first catalogue. 



6 Connaiss. de Terns., 1795, p. 424, 

 1 Connaiss. de Terns., 1796-7, p. 392. 



8 Bode's Jahrbuch fur 1799. 



9 Connaiss. de Toms., 1797-8, p. 466. 

 i° Connaiss de Terns., 1798, p. 486. 



11 Connaiss. de Terns., 1798-9, pp. 486, 7. 

 '- Memoirs of the Lit. and Philosophical Society, Manchester, 

 V. p. 674. 



i-i Connaiss. de Terns., 1803, p. 511. 



14 These are the same as I have translated July 23 and 

 Sept. 3. Thermidor 5 and Kructidor 17. 



15 Connaiss. de Terns., 1803-4, p. 603. 



m Krusenstern's Keise um die Welt etc.Hoppner's Transl. 1. 32 

 ir Neuestc Schriften von Danzig, II. 



