OX THE PERIODICITY OF THE AURORA BOREALIS. 



89 



Sept. 



Oct. 



4. 



5. 



5. 



5. 



5. 



5. 



5. 



5. 



5. 



6. 



6. 



6. 



7. 



8. 

 10. 

 10. 

 10. 

 12. 

 18. 

 20. 

 24. 

 24. 

 24. 

 24. 

 24. 

 25. 

 25. 

 25. 

 2G. 

 26. 

 26. 

 26. 

 27. 

 28. 

 29. 



1. 



2. 



3. 



4. 



4. 



5. 



5. 



6. 



9. 

 11. 

 12. 

 12. 

 18. 

 21. 

 21. 



Ratisbon. Heinrich. Brussels. Mann. 

 Salem. Holyoke. Lovering. 

 New Haven. Stiles. Loomis. Berne. Studer. 

 Mannheim. Ilemmer. Padua. Toaldo. 

 Munich. Huebpauer. Sagan. Preus. 

 Erfurt. Planer. Wiirzburg. Egel. 

 Ratisbon. Heinrich. Sit. Petersburg. Euler. 

 Tigurina Aedes. Magold. Jena. Zeissiug. 

 Rome. Calandrelli. Sutz. Spriingli. 

 Erfurt. Planer. Wiirzburg. Egel. 

 St. Petersburg. Euler. 

 Kendal. Dalton. Sagan. Preus. 

 Wiirzburg. Egel. 

 Stockholm. Nicander. 

 Cambridge. Wiggles worth. Lovering. 

 Kendal. Dalton. Jena. Zeissing. 

 Stockholm. Nicander. 

 Mannheim. 9 Hemmer. 

 Stockholm. Nicander. 

 Munich. Huebpauer. 

 Cambridge. Wigglesworth. Lovering. 

 Spain. Rico. Jena. Zeissiug. 

 Tigurina Aedes. Magold. 

 Stockholm. Nicander. Sagan. Preus. 

 Mannheim. Hemmer. Erfurt. Planer. 

 Cambridge. Wigglesworth. Lovering. 

 Salem. Holyoke. Lovering. 

 Stockholm. Nicander. 

 Cambridge. Wigglesworth. Lovering. 

 Salem. Holyoke. Lovering. 

 Stockholm. Nicander. Moscow. Stritter. 

 St. Petersburg. Euler. 

 Sagan. Preus. St. Petersburg. Euler. 

 Salem. Holyoke. Lovering. 

 Sagan ? Preus. Stockholm. Nicander. 

 Stockholm. Nicander. 



Nicander. 



Nicander. 



Wigglesworth. Lovering. 



Nicander. 



Wigglesworth. Lovering. 

 Holyoke. Lovering. 

 Holyoke. Lovering. 



Stockholm. 



Stockholm. 



Cambridge. 



Stockholm. 



Cambridge. 



Salem. 



Salem. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Mannheim. Hemmer. 



Paris. Cassini. Kendal. Dalton. 



Sagan ? Preus. 



Kendal. Dalton. Spain. Rico. 



Marseilles. St. Jacques. Geneva. Senebier. 



VOL. X. 12 



Oct. 21. 



" 22. 



" 22. 



" 22. 



" 22. 



" 22. 



" 22. 



" 22. 



" 22. 



" 22. 



" 24. 



" 25. 



" 26. 



" 27. 



" 27. 



" 28. 



" 29. 



" 30. 



" 30. 



" 30. 



" 31. 



" 31. 

 Nov. 1. 



" 2. 

 3. 



" 4. 



" 7. 



" 18. 



" 19. 



" 21. 



" 22. 



" 23. 



" 26. 



" 27. 



" 28. 



" 30. 

 Dec. 8. 



" 15. 



" 16. 



" 20. 



" 21. 



" 22. 



" 23. 



" 23. 



" 23. 



" 24. 



" 25. 



" 26. 



" 30. 



St. Petersburg. Euler. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. Spain. Rico. 



St. Petersburg. Euler. 1 Jena. Zeissing. 



Moscow. Stritter. Rochelle. Seignette. 



Geneva. Senebier. Deluc. 



Marseilles. St. Jacques. Bezicrs. P>ertholon. 



Padua. Toaldo. Rome. Calandrelli. 



Mannheim. Hemmer. Buda. Bruna. 



Sagan. Preus. Erfurt. Planer. 



Stockholm. Nicander. Kendal. Dalton. 



Sagan. Preus. Stockholm. Nicander. 



Geneva. Senebier. 



Sagan. Preus. Keswick. Dalton. 



Stockholm. Nicander. 



Sagayi ? Preus. Stockholm. Nicander. 



Sagan. Preus. 



Cambridge. Wigglesworth. Lovering. 



Salem. Holyoke. Lovering. 



Sagan. Preus. Kendal. Dalton. 



Paris. Cassini. Kendal. Dalton. 



Stockholm. Nicander. Boon. Cotte. 



Geneva. Senebier. Kendal. Dalton. 



Erfurt. Planer. Sagan. Preus. 



Sagan ? Preus. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Sagan. Preus. 



Kendal. Dalton. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Mannheim, Hemmer. 



Sagan ? Preus. 



Kendal. Dalton. 



Kendal. Dalton. 



Stockholm. Nicander. 



Mannheim. Hemmer. 



Mannheim. Hemmer. 



Mannheim. Hemmer. 



Peissenberg. Schwaiger. 



Kendal. Dalton. 



Stockholm. Nicander. 



Sagan. Preus. Brussels. 



Paris. Cassini. Ratisbon. 



Berne. Studer. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Stockholm. Nicander. 



Mannheim. Hemmer. 



Sagan. Preus. 



Kendal. Dalton. 



Mann. 

 Heinrich. 



Kendal. Dalton. 



: l Aurora Australia. 



