308 MEMOIRS OF THE AMERICAN ACADEMY. 



8- (magna), 25, 26, 28 ; May 1« (coruscans), 2« (tenuis), 3, 4 (tenuis), 6, 7, 8 (tenuis), 22, 23 ; June 2 ; » July 

 26- (coruscans), 27 (coruscans) ; Aug. 4, 5, 26 ; 2 Sept. 2 (aurora australis), 7, 9 ; Dec. 14«, 26. 



1751. Jan. 3, 4, 24; March 1, 2, 9 (magna), 15, 16, 17-, 19, 21, 31 ; April 2-, 19, 21 ; May 22 ; Sept 

 11, 15 (tenuis), 28 ; Oct. 19 ; Dec. 24. 



1752. Jan. 9- (sparsa, placida) ; March 2, 7-, 18% 21, 22 ; April 3, 7 (tenuis), 14, 17 (magna), 18, 21, 26 ; 

 May 9, 10, 13, 15, 16 ; Aug. 7, 10, 12-, 29, 31 ; Oct. 3- (coruscans), 5- (coruscans), 12>, 13* (magna), 14- ; 

 Nov. 10-, 11-, 13, 28-; Dec. 5-. 



1753. Jan. 2 ; April 7, 24, 27 ; May 1, 2, 3, 4, 23 ; Aug. 27, 31 ; Sept. 22, 27 ; Nov. 28 ; Dec. 30, 31. 



1754. Jan. 11, 19, 22, 26, 27, 31 ; Feb. 14, 15, 19, 21, 23, 24-, 27; March 18-, 21, 24 (magna), 25> 

 (tenuis) ; April 12, 15, 16, 18, 19, 23, 28 ; May 8, 9, 16, 17 ; July 23 ; Aug. 14, 17, 19, 22, 23 ; Sept. 21, 

 24; Oct. 12, 16- ; Nov. 14; Dec. 14, 18, 19. 



1755. Jan. 15 ; April 11, 12, 13, 14, 15 ; May 4, 5, 7, 15 ; July 15 ; Aug. 15, 17 ; Sept. 29 ; Oct. 3, 10, 

 14; Nov. 6, 7, 9; Dec. 20, 29. 



1756. Jan. 20 ; Feb. 5 ; March 24 ; April 1, 30 ; May 4, 7, 20 ; July 17 ; Aug. 1 ; Sept. 14-, 17 (magna), 

 24 (parva), 29- ; Oct. 12, 26, 30 ; Nov. 18, 20.; Dec. 1, 24, 25. 



1757. Feb. 10, 19, 20, 23 ; March 10 (pulchra), 11 (magna), 17, 20, 25, 26, 27 (levis), 28 ; April 14, 18, 

 21. 23, 30 : May 13, 15, 16 ; Aug. 9, 12, 15, 16, 19 ; Sept. 1, 2, 16- (coruscans), 18 ; Nov. 12-, 17. 



1758. Jan. 7, 8-, 9 (parva), 10 (coruscans) ; Feb. 2, 12, 13, 14, 2.3 ; March 13, 14, 29, 30 ; April 13 ; 

 May 2, 9, 10, 11 ; July 27, 28, 29, 30. 



II. Auroras observed at Haarlem? 

 1735. March 20-, 23- ; April 23- ; July 17 ; Aug. 6, 9, 12, 19, 20-, 21, 23-. 



III. Observations on the Aurora, made by Professor Parker Cleaveland, at Brunswick, Maine. 



1807. Nov. 20 (at 8 o'clock), 28 (faint). 



1808. Jan. 30 (bright) ; Feb. 18 (bright), 24, 25 ; March 19, 23, 25, 26 ; April 14, 22, 23; June 25. 



1814. April 17- (brilliant, from 8 h p. m. to midnight. At 8 h 30 m an irregular arc, about 30° above the 

 horizon, from which brilliant coruscations ascend to the zenith. A spot in the zenith detached and radiating 

 in all directions) ; Sept. 11" (through most of the night), 12 (less brilliant). 



1815. March 8 ; April 12. 



1816. Sept. 24- (arch and radii). 



1817. Feb. 8- (in evening: vertex 30° high), 27 (in spots) ; Oct. 13 (at 9 o'clock, low arc). 



1818. Aug. 4 ; Sept. 20- (bright: two extensive streamers), 21, 26- (bright) ; Oct. 1-, 5, 19, 22. 



ejus materia erat in marginibus rarissima, in medio densior et fulgentior, nonuunquam cum motu tremulo, verum omnes 

 stellae fixae per lumen spectari potueruut. 



1 Mense Junio, die 2°, Aujrora Borealis erat toto caelo conspicua, fornix nigra et obscura, ab horizonte non procul caelum 

 nitebat et ardebat in rotundum, praecipue plaga orientalis, septentrionalis, et occidentalis. 



1 Mense Augusto, die 26°, Aurora Borealis coruscans fuit cum niultis columnis ab hora $\ ad 10 noctumam ; die 2°, 

 hora 8i, bolis valde nitens fuit. 



' These were found recorded in the manuscripts of Musschenbroek. 



