ON THE PERIODICITY OF THE AURORA BOREALIS. 



14' 



New Haven ? Herrick. Newton and Loomis. 

 Mew York: Hougli. 



Cumberland, Md. Ilcrrick. Newton and L. 

 London, Canada West. Lefroy. 

 Makerstoun. Broun. England. Hough. 

 Dunse. Stevenson. 



New Haven. Ilerrick. Newton and Loomis. 

 New York. Hough. Providence. Caswell. 

 Newberry. Johnson. Worcester. Chandler. 1 

 Quebec and Montreal. Lefroy. 

 Kingston, Toronto, and London. Lefroy. 

 Jakobshavn. Rudolph. 



Cliristiania. Hansteen. Schmidt. 



Makerstoun. Broun. Yakoutsk. Kupffer. 

 L,eipsic, Pegau, Lutsen, fyc. Jahn. 

 Toronto. Lefroy. Sitka. Kupffer. 

 Makerstoun. Broun. Dunse. Stevenson. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Providence. Caswell. 

 Worcester. Chandler. 

 Quebec and Montreal. Lefroy. 

 Kingston, Toronto, and London. Lefroy. 

 Christiania. Hansteen. Jakobshavn. Rudolph. 

 Cambridge. Bond. Lovering. 

 New Haven. Herrick. Newton and Loomis. 

 New York. Hough. Providence. Caswell. 

 Quebec and Montreal. Lefroy. 

 Kingston, Toronto, and London. Lefroy. 

 Jakobshavn. Rudolph. 

 Yakoutsk and Barnaoid. Kupffer. 

 Cambridge. Bond. Lovering. 

 Newberry. Johnson. 

 Quebec and Montreal. 

 New Haven. Herrick. 

 Mon/pelier. Roche. 

 Quebec. Lefroy. 

 Kingston. Lefroy. 

 Montreal and Toronto. 

 Cliristiania. Hansteen. 

 New York. Hough. 

 Montreal, Kingston, and Toronto. 

 Bonn. Schmidt. Bone. 

 Cambridge. Bond. Lovering. 

 Toronto and London. Lefroy. 

 Kingston. Lefroy. 



Quebec, Monti eal, and Toronto. Lefroy. 

 Quebec and Montreal. Lefroy. 

 Kingston and Toronto. Lefroy. 



1 Sixteenth Report of the Lunatic Asylum, p. 60. 



Lefroy. 



Newton and Loomis. 



Lefroy. 



Lefroy. 



New York. Hough. 

 New York. Hough. 

 Kingston and Toronto. 

 Makerstoun. Broun. 

 Quebec. Lefroy. 

 Makerstoun. Broun. 

 Cambridge. 

 New York. 

 Cambridge. 

 New Haven. 

 New York. 



3fakerstotm. Broun. 



Lefroy. 



Schmidt. 



Lefroy. 



Bond. Lovering. 



Hough. Quebec. 



Bond. Lovering. 

 Herrick. Newton and Loomis. 



Hougli. Providence. Caswell. 

 Quebec and Montreal. Lefroy. 

 Kingston and Toronto. Lefroy. 

 Makerstoun. Broun. Hobarton. Sabine. 

 Cambridge. Bond. Lovering. 

 New York. Hough. 

 Toronto. Lefroy. 

 New York. Hough. 



New Haven. Herrick. Newton and Loomis. 

 New York. Hough. 

 Montreal and Kingston. Lefroy. 

 Toronto ? Lefroy. 



New Haven. Herrick. Newton and Loomis. 

 New York. Hougli. 

 Quebec and Montreal. Lefroy. 

 Kingston, Toronto, and London. Lefroy. 

 New Haven. Ilerrick. Newton and Loomis. 

 New York. Hough. Worcester. Chandler. 

 Kingston, Toronto, and London. Lefroy. 

 Quebec and Montreal. Lefroy. Jahn. 

 New York. Hough. Quebec. Lefroy. 

 Kingston and Toronto. Lefroy. 

 Christiania. Hansteen. 

 Cambridge. Bond. Lovering. 

 New York. Hough. 

 Quebec and Montreal. Lefroy. 

 Kingston, Toronto, and London. 

 Christiania. Hansteen. 

 Cambridge. Bond. Lovering. 

 Boston. Hale. Lovering. 

 Worcester. Chandler. 



New York. Hough. Providence. Caswell. 

 New Haven. Herrick. Newton and Loomis. 

 Newberry. Johnson. Hobarton. Sabine. 

 Quebec and Montreal. Lefroy. 

 Kingston, Toronto, and London. Lefroy. 

 Aix-la-Chapelle. Heis. 1 Jahn. 

 New Haven. Herrick. Newton and Loomis. 



i Bull, de l'Aead. Brux. XVI. Pt. I. p. 4. 



Lefroy. 



