ON THE PERIODICITY OF THE AURORA BOREALIS. 



99 



1815. 1 



Apr. 5. Lat. 69° N. Long. 2°. Scoresby. 

 " 6. Lot. 70° JV. Long. 3°. Scoresby. 

 " 7. Lat. 70° N. Long. 4°. Scoresby. 



1816. 



Sept.15. G. Britain or Ireland. Dalton. 



" 24. Glasgow. Dobbie. 2 



" 26. Salem. Holyoke. Lovering. 



Oct. 7. C/iristiania. Hansteen. 8 



" 7. Muncke, Quetelet, and Biot. 4 



1817. 



Feb. 6. Paris. Muncke. Quetelet. 5 



" 8. Leipsic. Mollweide. 6 Scbubler. 7 



" 8. G. Britain or Ireland. Dalton. 



" 8. Sunderland. Pensey. 8 Gosport. Burney. 



" 8. London, Leeds, and Derby. 9 



" 8. Berne. Watt. Studer. 10 



" 8. C/iristiania. Hansteen. Biot. Germany. 11 



" 8. .Paris. Muncke and Quetelet. 



" 9. Konigsberg. Muncke and Quetelet. 



" 9. Leipsic. Mollweide. 12 



" 11. Stockholm. Muncke and Quetelet. 



" 18. Hamm. Gronau. Muncke and Quetelet. 13 



" 20. WaOhamstow. 1 * 



Mar. 4. Carlsruhe. Studer. 



" 5. Gordon Castle. Hoy. Glasgow.™ 



" 15. Stockholm. 16 



" 16. Stockholm. 11 



" 29. Atlantic Ocean. 0'Reilly. ls 



" 30. Atlantic Ocean. O'Reilly. 



1 Henderson says of Iceland in the winter of 1814-15, "that 

 the aurora was seen almost every clear night in winter, p. 577. 



2 Phil. Mag. LVI. 175. 



8 Schweigg. Joarn. XVI. 196. Edin. Phil. Journ. XII. 88. 



* Journ. de Phys. XCIII. 15. 



6 Ann. Chem. et Phys. VI. 443. 



6 Gilbert. Ann. LV. 248. 



' Journ. de Phys. LXXXV. 29. Schweigg. Journ. XIX. 1 . 



8 Annals of Phil. IX. 250 and XI. 168. 



9 Phil. Mag. XLIX. 223. 

 w Bib. Univ. IV. 158. 



" Phil. Mag. XLIX. 236. Edin. Phil. Journ. XII. 88. 



' 2 Gilbert. Ann. LV. 248. 



18 Berlin Gesellsch Naturforsch. 1820, p. 128. 



14 Phil. Mag. XLIX. 237. 



15 Phil. Mag. LI. 422. 



16 Amer. Journ. Sci. XVI. 



17 Amer. Journ. Sci. XVI. 



io Voyage to Davis's Straits, &c. p. 29. 



Apr. 5. 



" 8. 



" 8. 



" 16. 



" 22. 



" 23. 

 Aug. 27. 

 Sept. 6. 



" 19. 



« 19. 

 Oct. 17. 



Zetland, Scoresby. 

 Near Davis's Straits. O'Reilly. 

 Lat. 65° A 7 . Long. 1° E. Scoresby. 

 Near Davis's Straits. O'Reilly. 

 Lat. 62° N. Long. £° W. Scoresby. 

 Lat. 62° N. Long. 2° E. Scoresby. 

 Unst, Shetland. Biot, Muncke. and Quetelet. 1 

 Unst. Biot. 2 



Glasgow. Dupin. Muncke and Quetelet. 3 

 Gosport. Burney. 4 

 Gosport. Burney. 6 



1818. 



Gordon Castle. Hoy. 8 

 Lat. 11° N. Long. 1°. Scoresby. 

 Williamstown, Mass. Dewey.' 

 Williamstown, Mass. Dewey. 

 Williamstown, Mass. Dewey. 

 New Haven. Day. Loomis. 

 Williamstown. Mass. Dewey. 

 Williamstown, Muss. Dewey. 

 Williamstown, Mass. Dewey. 

 WiUiamstovm, Mass. Dewey. 

 Nero Haven. Day. Loomis. 

 At sea, Lat. 66° N. Long. 59° W. Robertson.' 

 WiUiamstovm, Mass. Dewey. 

 WiUiamstovm, Mass. Dewey. 

 Boston, Hale. Lovering. 9 

 New Haven. Day. Loomis. 

 At sea, Lat. 65° N. Long. 61° W. Robertson. 

 Salem. Holyoke. Lovering. 

 At sea, Lat. 65° N. Long. 63° W. Robertson. 

 At sea, Lat. 65° N. Long. 63° IT. Robert sor. 

 At sea, Lat. 62° N. Long. 63° W. Robertson. 

 Williamstown. Mass. Dewey. 

 At sea, Lat. 60° N. Long. 56° W. Robertson. 

 WiUiamstovm, Mass. Dewey. 

 Lot. 59° N. Long. 50° W. Robertson. 

 Lat. 61° N. Long. 25° W. Robertson. 

 G. Britain or Ireland. Dalton. 

 G. Britain or Ireland. Dalton. 



1 Journ. de Phys. XCIII. 15. 



2 Journ. de Savans. 1820. 



8 Phil. Mag. LI. 47. Bib. Univ. VII. 68. 



4 Annals of Phil. XI. 168. 



6 Annals of Phil. XIV. 395. 



6 Phil. Mag. LI. 422. 



" Mem. Amer. Acid. IV. 391. 



8 Ross's Voyage of Discovery, &c, Appendix, p. 120. 



'■' Mem. Amer. Acad. IX. 119. 



