250 



ON TIIE PERIODICITY OF THE AURORA BORE WIS. 



# u 

 1769. 



'1768. Aug. 6. 



" Sept. 19. 



« « 19. 



" Oct. 5. 



« " 5. 



•' " 12. 



: tl U 28. 



* » " 28. 



* " « 28. 

 ( " Nov. 16. 



* " " 16. 

 " " 20. 



* " Dec. 5. 



* " " 5. 

 '• 5. 



Jan. 9. 



Feb. 2. 



" 18. 



" 20. 



" 22. 



" 22. 



" 22. 



" 26. 



" 27. 



'• 27. 



" 27. 

 March 3. 



" 3. 



" 4. 



" 6. 



•• 11. 

 12 



" 22. 



" 23. 



" 24. 



" 25. 



Paris. Messier. 

 Prince of Wales Fort. 1 

 Hudson's Bay. 

 Prince of Wales Fort. 

 Dymond and Wales. 

 Russia. Pictet. Wolf. 2 

 Paris. Messier. 8 

 Gurzelen. Sprungli. 

 Rome and Vicuna. Cotte. 

 Prince of Wales Fort. 

 Dymond and Wales. 

 War doe f Littrow.* Wolf. 

 Gurzelen. Sprungli. 

 Vienna. < '"tte. 6 

 Paris. Messier. 8 

 Russia. Pictet Wolf.' 

 Wardoef Littrow. Wolf. 

 Nimbosero, Lapland. Mallet. 

 Wardoef Littrow. Wolf. 8 

 Kola, Lapland. Mallet. 

 Between Poria and Umbam. 

 Pictet. Wolf. 

 Paris. Messier. 9 

 Terski alio, Lapland. 

 Mallet. Wolf. 

 Umbam, Lapland, Pictet. 

 Umbam. Pictet. Wolf. 

 Ponoi. Mallet. 

 Umbam. Pictet. Wolf. 

 Umbam. Pictet. Wolf. 

 Umbam. Pictet. 

 Umbam. Pictet. 

 Umbam. Pictet. 

 Ponoi. Mallet. 



Ponoi. Mallet. 

 Ponoi. Mallet. 



Wolf. 



Wolf. 



Wolf. 

 Wolf. 



Wolf. 



i Phil. Trans. LX. 138. 



- Vierteljahrsschrift der Naturforsch. Gesellsch. in Zurich 

 V. 218. 



; Mittheil. Naturforsch. Gesellsch. Bern, 18oJJ, p. 43. 



4 Hell's Reise nach Wardoe etc. 



s Mem. ile Savans Etrang. Paris, VII. 480. 



B Connaiss. de Terns., 1806, p. 429. 



' Collectio Observ. Trans. Veneris. St. Petersburg, 1770. 

 pp. 75-106, It is not alwuifs stated whether the observations 

 are made in old or new style. Pictet's are said to be in neu- 

 style. 



8 Vierteljahrsschrift der Naturforsch. Gesellsch. in Zurich, 

 II. 403. 



9 Connaiss. de Tems., 1806, p. 429, 



' Connaiss. de Terns., 1806, p. 429. 



2 Phil. Trans. LIX. 372, 3. 



3 Untersuchungen iiber das Wahrscheinlich der Wetter- 

 kunde etc , p. 419. 



4 He quotes the Journal des Savans, 177;. 



5 Cotte observed at Montmorenci in 1772 six auroras: one 

 in March, a very fine one on August 31, three in October, of 

 which that of the 26th was fine, and one in December. — Journal 

 des Savons, 1773. p. 174. 



« Phil. Trans. I..VXX 32 



" Bode's Jahrbuch fur 1787, p. 241. 



3 Nouv. Mem. de l'Acad. Berlin, 177"., p. 175, etc. 



9 This is given as Sept. 21 in Nouv. Mem de l'Acad. Berlin, 

 1777, p. 91. 



K> Connaiss. de Terns.. 1781. p. 390. 



" This is given as Aug 2~ in Nouv. Mem.de l'Acad. Berlin. 

 177s. p. 85. 



i- Vierteljahrsschrift der Naturforsch. Gesellsch. in Zurich. 

 V. 327. 



