ON THE SECULAR PERIODICITY OF THE ACUORA BOREALIS. 



115 



222 Mar. 29. Evening. Aurora Borealis. 



223 April 6. 



224 



228 



231 



232 



234 



237 



<< 



11. 



Evening, 

 realis. 

 Evening. 

 Evening. 



Considerable Aurora Bo- 



Aurora Borealis. 

 Aurora Borealis. 



225 June 28. 



226 July 27. Evening. Little Aurora Borealis. 



227 Sept. 7. 



u 



24. 



Evening. 

 Evening. 



Great Aurora Borealis. 

 Aurora Borealis. 



229 Oct. 8. Evening. Aurora Borealis 



230 Nov. 3. 



a 



27. 



Evening. 

 Evening, 

 realis. 



Great Aurora Borealis. 

 Extraordinary Aurora Bo- 



" 28. (12£ h ,A.M.) Evening. Aurora Bo- 

 realis continues. 



233 Dec. 2. Evening. Aurora Borealis. 



« 21. 



Evening. 



Aurora Borealis. 



1778. 



235 Jan. 18. Evening. Aurora Borealis. 



236 Feb. 15. 



u 



Evening. 



Aurora Borealis. 



17. Evening. Bright Aurora Borealis 



238 liar. 17. Evening. Small Aurora Boreali-. 



239 

 240 



242 

 243 



250 





252 

 253 



ii 



.. 



22. 

 24. 



Evening. 

 Evening. 



Aurora Borealis. 

 Bright Aurora Borealis. 



241 April 20. Evening. Small Aurora Borealis. 



" 23. Evening. Bright Aurora Borealis, 



a 



26. Evening. Aurora Borealis. 



Evening. 



Aurora Borealis. 



244 May 13. 



245 June 14. Evening. Aurora Borealis 



246 " 28. Evening. Aurora Borealis. 



247 July 7. Evening. Uncommon Aurora Bore- 



alis. 

 31. Evening. Little Aurora Borealis 



248 



249 Sept. 22. Evening. Aurora Borealis. 



.» 



24. 



Evening, 



Great Aurora Borealis 



1779. 



251 Feb. 10. 



« 



<< 



Bright Aurora. 

 Aurora Borealis. 

 13. Evening. Aurora Boreali 



11. 



Evening. 



Evening. 



254 April 5. 



Evening 



Aurora Borealis 



CATALOGUE 



O F 



AURORAS. 



Compiled from Professor WiggleswortJi 9 $ Journal. 



1780, defective 



1781. 



255 Mar. 27. Aurora Borealis. 



1782. 



256 Sept. 12. Aurora Borealis. 

 257 



258 



" 13. Aurora Borealis. 



" 30. Aurora Borealis 



259 Oct. 2. Aurora Borealis 



26 <> " 3. Aurora Borealis 

 261 



" 10. Aurora Borealis 



262 Nov. 26. Aurora Borealis. 



1783. 



263 Jan. 31. Aurora Borealis 



264 Feb. 2. Aurora Borealis 



27. Aurora Borealis, 



265 



266 Mar. 2. Aurora Borealis 



267 

 268 

 269 

 270 



u 



« 



u 



« 



4. Aurora Borealis 



26. Aurora Borealis 



29. Aurora Borealis 



30. Aurora Borealis 



271 April 2. Aurora Boreal* 



272 " 7. Aurora Borealis, 



273 " 27. Aurora Borealis. 



274 May 2. Aurora Bon alis, 



275 

 276 



" 13. Aurora Borealis. 

 " 29. Aurora Borealis. 



1784. 



277 June 11. Aurora Borealis. 



278 Sept. 15. Aurora Borealis. 



279 Nov. 15. Aurora Borealis. 



280 Dec. 11. Aurora Borealis. 



1785. 



281 May 9. Aurora Borealis. 



282 Sept 8. Aurora Borealis. 



283 Oct. 6. Aurora Borealis. 



284 Nov. 29. Aurora Borealis. 



285 

 286 



« 30. Aurora Boreali-. 

 Dec. 19. Aurora Borealis. 



1786. 



287 Feb. 28. White Aurora Borealis. 



