10 ON THE PERIODICITY OF THE AURORA BOREALIS. 



auroras observed at St. Martin, Canada, in 1853 and 1804, by Smallwood ; 53 auroras ob- 

 served at Wilmington, Del., between 1827 and 1833, by Gibbon ; 218 auroras observed at 

 Newberry, Vt., between 1830 and 1862, by Jobnson; 3S9 auroras observed at Toronto, 

 Canada, 169 at Quebec, 107 at London, Canada, 151 at Newfoundland, between 1848 

 and 1851, by Lefroy, &c. ; x 84 auroras observed at Jena, Germany, between 1770 and 

 1796, by Zeissing ; 341 auroras observed at Stockbolm, Sweden, between 1783 and 1792, 

 by Nicander; 942 auroras observed at St. Petersburg, between 1736 and 1861, by va- 

 rious Russian meteorologists ; 231 auroras observed at Brussels, Belgium, between 1778 

 and 1851, by Mann, Quetelet, &c. ; 634 auroras observed at Upsal, Sweden, between 

 1732 and 1762, by Celsius, Ferner, or Bergman; 225 auroras observed at Berlin, 

 Prussia, between 1735 and 1789, by Beguelin; 10S auroras observed in Paris, France, 

 between 1784 and 1842, by Cassini or Bouvard; 175 auroras observed af Montinorenci 

 or Laon, France, between 1771 and 1805, by Cotte ; 81 auroras observed at Spydberg, 

 &c, Norway, between 17S4 and 17S7, by Wilse ; 240 auroras observed at Sagan, 

 Prussia, between 1781 and 1792, by Preuss; 288 auroras observed in Scandinavia, &c, 

 between 1837 and 1840, by Lottin, Thomas, &c. ; 216 auroras observed at Mannheim, 

 Germany, between 1781 and 1792, by Hemmer; 48 auroras observed at Copenhagen, Den- 

 mark, between 17S2 and 1788, by Bugge; 54 auroras observed at Ratisbon, Germany, 

 by Heinrich, and 47 auroras observed at Prague, Austria, by Strnad, between 1781 and 

 1791. With these I have united Loomis's catalogue of S13 auroras observed at New 

 Haven, Conn., between 1763 and 1S54, by Stiles or Herrick; Hough's catalogue, of 1205 

 auroras observed in the State of New York, between 1820 and 1851 ; Leche's catalogue 

 of 119 auroras observed at Abo, Finland, between 1749 and 1762 ; 2 Argelander's 

 catalogue of 163 auroras observed at Abo, between 1823 and 1831, and at Helsingfors, 

 between 1832 and 1837; Hallstrom's catalogue of 682 auroras observed at Abo, 

 between 1748 and 1S2S, and at Helsingfors, between 1829 and 1843; Block's catalogue 

 of 430 auroras observed at Gothaab, Greenland, between 1841 and 1S46 ; Noodt's 

 catalogue of 91 auroras observed at Hammerfest, Norway, between 1850 and 1861 ; 

 Dalton's catalogue of 250 auroras observed at Kendall or Keswick, England, between 

 1786 and 1793, and his catalogue of 185 auroras observed in Great Britain and 

 Ireland, between 1794 and 1834 ; Huxham's catalogue of 120 auroras observed at 

 Plymouth, England, between 1728 and 1748 ; Broun's catalogue of 184 auroras 

 observed at Makerstoun, Scotland, between 1843 and 1849 ; Stevenson's catalogue of 

 238 auroras observed at Dunse, North Britain, between 1838 and 1847 ; 3 Hansteen's 



i Phil. Mag., Fourth Scries, IV. 61-63. 2 Svenska Vetensk. Acad. XXIV. 267. 



5 Proc. Royal Society, London, VI. 291. Phil. Mag., Fourth Series, VI. 21. 



