30 



ON THE PERIODICITY OF TIIE AURORA BOREALIS. 



I /if/!. Burman. 



St. Petersburg. Kraft. The Delisles, Mairan. 



Berlin. Kirch. Lynn. Rastrick. 



Petworth. Langwith. 1 Mairan. 2 



Upsat. Burman. Celsius and Frobes. 



Short and Thompson. 



Fr.obes and Mairan. 



Frobes, Mairan, and Phil. Trans. 



Mairan and Phil. Trans. 



Mairan and Phil. Trans. 



Celsius, Mairan, and Phil. Trans. 



Mairan and Phil. Trans. 



Mairan. Phil. Trans. 



Sweden. Celsius. Frobes and Pilgram. 

 Lynn. Rastrick. 



Mairan, Pilgram, and Short. 

 Mairan and Phil. Trans. 



Beccari. 3 



Frobes, Mairan, and Phil. Trans. 

 Upsal. Burman. 



Pilgram. West. Godin. 



Mairan and Phil. Trans. 

 Frolics and Mairan. 



Mairan and Short. 



Sweden. Celsius. Frobes and Mairan. 



MontpelKer. Plantade. 4 



Frobes, Mairan, and Phil. Trans. 



/ r psaL Burman. 



Frobes, Mairan, and Phil. Trans. 



Upsal. Burman. 



Celsius, Mairan, and Phil. Trans. 



Mairan and Phil. Trans. 



Mairan and Phil. Trans. 



Sweden. Celsius. Frobes. 



Mairan and Phil. Trans. 



Sweden. Celsius. Frobes and Mairan. 



Mairan and Phil. Trans. 



Mairan and Phil. Trans. 



Mairan and Phil. Trans. 



Mairan and Phil. Trans. 



1727. 

 Jan. 1. Sweden. Celsius. Frobes and Mairan. 

 " 2. Mairan and Phil. Trans. 



i Phil. Trans., 1726, p. 132. 



2 Mr. Herrick probably means this aurora when he refers to 

 the aurora of August 19, 1726, as having excited Mairan to his 

 great undertaking. Amer. Journ., XXIX. 388. 



8 Comm. Bonon., I. 288. 



4 Encyc. Method., I. 370. 



Celsius, Frobes, and Mairan. 



Langwith. 1 



Frobes, Mairan, and Pilgram. 



Langwith. 



Celsius, Frolics, Mairan, and Pilgram. 



Celsius, Frobes, Mairan, and Pilgram. 



Sweden. Celsius. Frobes and Mairan. 



Italy. Beccari. Utrecht. Musscheubroek. 



St. Petersburg. Kraft. The Delisles. Mairan. 



St. Petersburg. Kraft. The Delisles. Mairan. 



St. Petersburg. Kraft. The Delisles. 



Siceden. Celsius, Frobes, and Mairan. 



St. Petersburg. Kraft. The Delisles. 



Celsius, Frobes, and Mairan. 



Sweden. Celsius, Frobes, and Mairan. 



Sweden. Celsius, Frobes, and Mairan. 



Italy. Beccari. 



Sweden. Celsius. Frobes and Mairan. 



Celsius, Frobes, and Mairan. 



St. Petersburg. Kraft. Berlin. Kirch. 



Petworth. Langwith. 



Celsius, Frobes, Mairan, and Pilgram. 



U/jsal. Burman. 2 



Bologna. Zanotti. Lynn. Rastrick. 



Berlin. Kirch. Petworth. Langwith. 



Celsius, Frobes, Mairan, and Short. 



Upsal. Burman. 



Frobes and Mairan. 



Bologna. Zanotti. Lynn. Rastrick. Short. 



Celsius, Frobes, Mairan, and Pilgram. 



Upsal. Burman. 



Bologna. Zanotti. Mairan. 



Celsius, Frobes, Mairan, and Pilgram. 



Bologna. Zanotti and Beccari. Mairan. 



Bologna. Zanotti and Beccari. Mairan. 



Frobes and Mairan. 



Bologna. Zanotti. Mairan. 



St. Petersburg. Kraft. The Delisles. 



Mairan. Celsius and Frobes. 



Upsal. Burman. 



Celsius, Frobes, and Mairan. 



Italy. Beccari. Mairan. 



Celsius, Frobes, and Mairan. 



Upsal. Burman. Celsius, Frobes, and Mairan. 



Frobes and Mairan. 



Berlin. Kirch. 



i Phil. Trans., XXXV. 304. 

 2 Acta Lit. Suecise, II. 493. 



