ON THE PERIODICITY OF THE AURORA BOREALIS. 



101 



Winter Harbor. Parry. 

 Cumberland House. Parry. 

 Cumberland House. Franklin. 

 Fort Isle la Croise. Franklin. 

 Winter Harbor. Parry. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Winter Harbor. Parry. Arago. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Richardson. 

 Boston. Hale. Lovering. 

 Salem. Holyoke. Lovering. 

 Cambridge, N. Y. Joslin. 

 Fort Chippewyan. Franklin. Arago. 

 Fast Greenland. Seoresby. 2 

 Muncke and Quetelet. 

 Cumberland House. Richardson. 

 Cumberland House. Richardson. 

 Cumberland House. Richardson. 

 Cumberland House. Richardson. 

 Cumberland House. Richardson. 

 Cumberland House. Richardson. 

 Cumberland House. Richardson. 

 Fort Chippewyan. Franklin. 

 Fort Chippewyan. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 New Haven. Day. Loomis. 

 Cumberland House. Franklin. 

 Cumberland House. Franklin. 

 Fort Chippewyan. Franklin. 

 Cumberland House. Franklin. 



1 The corrascations of the aurora were very brilliant at Fort 

 Chippewyan, Lat. 59° N. Long. Ill W., almost every eveniug 

 of the first week of April. Franklin, I. 143. 



2 Journ. of a Voyage, &c. p. 31. 



May 5. Cumberland House. Franklin. 



" 12. Cumberland House. Franklin. 



" 18. Cumberland House. Franklin. 



" 23. Cumberland House. Franklin. 



" 28. Cumberland House. Franklin. 



June 1 6. Fort Chippeioyan. Franklin. 



Aug. 14. Hunter's Portage. Franklin. 



" 18. Near Fort Enterprize. Franklin. 



Sept. 12. At sea, Lat. 68° N. Long. 66° W. Parry. 



" 13. At sea, Lat. 68° N. Long. 60° W. Fisher. 1 



" 17. Akur Eyriin Iceland. Thienemann. 2 



Oct. 2. At sea, Lat. 57° JV. Long. 49° W. Parry. 



" 3. 3 . At sea, L. 57° N. Lg. 45° W. Parry. Arago. 4 



" 12. Akur Eyri. Thienemann. 



" 13. At sea, L. 60° N. Lg. 25° W. Parry. Arago. 



" 27. Akur Eyri. Thienemann. 



" 31. Akur Eyri. Thienemann. 



Nov. 6. Akur Eyri. Thienemann. 



" 9. Akur Eyri. Thienemann. 



" 11. Akur Eyri. Theinemann. 



" 13. Fort Enterprize. Richardson. 



" 14. Akur Eyri. Thienemann. 



" 24. Fort Enterprize. Richardson. 



" 24. Akur Eyri. Thienemann. 



" 26. Fort Enterprize. Richardson. 



" 26. Akur Eyri. Thienemann. 



" x. St. Petersburg. Muncke. 5 



Dec. 1. Fort Enterprize. Richardson 



" 2. Akur Eyri. Thienemann. 



" 3. Akur Eyri. Thienemann. 



" 4. Akur Eyri. Thienemann. 



" 4. Fort Enterprize. Richardson. 



" 4. England. Forster. 6 Arago. 



" 5. Fort Enterprize. Richardson. 



" 5. Akur Eyri. Thienemann. 



" 6. Fort Enterprize. Richardson. 



" 7. Fort Enterprize. Richardson. 



" 8. Fort Enterprize. Richardson. 



" 9. Fort Enterprize. Richardson. 



1 Edin. Phil. Journ. V. 204. 



2 Gilbert. Ann. LXXV. 64. 



8 Von Wrangel remarks, Nov. 20, 1820, of Nijnei Kolymsk, 

 Lat. 69° N. and Long. 161° E : " the beauty of the varied forms of 

 the aurora, seen on the deep azure of the clear northern ski/, was a 

 source of unwearied enjoyment to us almost every evening." Nar- 

 rative of an Expedition, &c. p. 83. Force, p. 80. 



1 Parry states that during his passage across the Atlantic, in 

 October, 1820, the aurora occurred almost every night. Journ. of 

 a Voyage, p. 306. Force, p. 7. 



6 Ann. Chem. et Phys. XV. 424. 



6 Researches about Atmosph. Phcnom. 219. 



