ON TIIE PERIODICITY OF THE AURORA BOREALIS. 



53 



Philadelphia. Kalm. Chelsea. Martyn. 1 



Plymouth. Huxham. The Hague. Gabry. 2 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. Gottingen. Hollmann. 



Upsal. Ferner. 



Upsal. Ferner. 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Steinebrunn. Bischoff. 



Italy. Beccari. Mairan. 8 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. 



Cambridge. Winthrop. Lovering. 



Philadelphia. Kahn. 



Cambridge. Winthop. Lovering. 



Philadelphia. Kalm. 



Stockholm. Ekeberg. 4 South Carolina, U.S. 6 



Cambridge. Winthrop. Lovering. 



Wittemberg. Weidler. Mairan. 



Tubingen. Kraft. Steinebrunn. Bischoff. 



Cambridge. Winthrop. Lovering. 



Leipsic. Heinsio. 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. Gottingen. Hollmann. 



Wittemberg. Weidler. Mairan. 



Cambridge. Winthrop. Lovering. 



Bologna. Zanotti and Beccari. Mairan. 



Reyger. Boue. 6 Reuss. 



Italy. Beccari. Mairan. 



Upsal. Ferner. 



Cambridge. Winthrop. Lovering. 



Tubingen. Kraft. 



Upsal. Ferner. Leipsic. Heinsio. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Cambridge. Winthrop. Lovering. 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. Gottingen. Hollmann. 



i Phil. Trans. XL VI. 345. 



a Phil. Trans. XL VII. 39. 



8 In his general catalogue, it is April 13. Traite &c. p. 546. 



4 Acad. Coll. Etrang. Dijon. XL 191. 6 Gent. Mag. XX. 428. 



6 Nat. Gesell. Danzig. Abh. in. 258. 



Upsal. Ferner. 

 Tubingen. Kraft. 

 Italy. Beccari. Mairan. 

 Gottingen. Hollmann. 

 Gottingen. Hollmann. 

 Upsal. Ferner. 



1751. 



Steinebrunn. Bischoff. 



Tubingen. Kraft. 



Gottingen. Hollmann. 



Cambridge. Winthrop. Lovering. 



Wittemberg. Weidler. Mairan. 



Cambridge. Winthrop. Lovering. 



Steinebrunn. Bischoff. 1 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. 2 



Cambridge. Winthrop. Lovering. 



Upsal. Ferner. 



Tubingen. Kraft. 



Cambridge. Winthrop. Lovering. 



Italy. Beccari. Mairan. 



Tubingen. Kraft. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Tubingen. Kraft. 



Upsal. Ferner. 



Upsal. Ferner. Thompson. 3 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. Steinebrunn. Bischofl. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



Ipsal. Ferner. 



Upsal. Ferner. Tubingen. Kraft. 



Upsal. Ferner. 



Upsal. Ferner. 



Upsal. Ferner. 



1752. 



Jan. 9. Upsal. Ferner. 



i N. Comm. Petrop. V. 405. 



12 Svenska Vetensk. Acad. XV. 175. 



8 Annals of Phil. 1814. IV. 427. 



