ON THE PERIODICITY OF THE AURORA BOREALIS. 



17 



136. B. C. Nihusius, Frolics, and Boguslawski. 



133. Nihusius and Frobes. 



128. Obsequens, Lyeosthenes, Frobes. 



113. Obsequens, Lyeosthenes, and Frobes. 1 



103. Ameria. Obsequens and Lyeosthenes. 



" Tudertum. Frobes and Bogusluwski. 2 



94.? Vesta. Obsequens and Lyeosthenes. 



" Frobes and Boguslawski. 



93. Vulsinum. Lyeosthenes. 



" Frobes and Boguslawski. 



92. Obsequens and Lyeosthenes. 



" Frobes and Boguslawski. 



G3. Obsequens, Lyeosthenes, Frobes, Boguslawski. 



1 7. ? Obsequens, Lyeosthenes, and Frobes. 



14. A. D. Seneca, 3 Frobes. 

 " Lyeosthenes, Wolffius. 4 



20. ? Seneca, Frobes. 6 



27. ? Fincelius, Liebknecht, 6 and Frobes. 



31.? Seneca,' Frobes. 



50. Lyeosthenes, Frobes. 



65. April 8. Jerusalem. Lyeosthenes, Frobes. 8 



72. May 21. Chasles. 9 [Doubtful.] 

 162. Lyeosthenes and Chasles. 

 196. Lyeosthenes and Frobes. 

 384. Lyeosthenes and Frobes. 

 394. Pilgrara. 10 [Probably a comet.] 

 397.? Pilgram. 

 400. Lyeosthenes and Frytschius. 



" Frobes and Chasles. 

 402. Frytschius and Frobes. 

 412.? Lyeosthenes and Chasles. 



450. Pilgrara. 



451. Pilgrara. 



454. Lyeosthenes, Frytschius, and Frobes. 



" Pilgram, Chasles, and Boguslawski. 

 462. ? Lyeosthenes and Frobes. 



i Pliny, Historia Nat. Mnndi. Lib. II. Cap. XXXIII. 



2 Pliny, Historia Nat. Lib. II. Cap. LVIII. (B. says 102.) 



8 Naturales Qua:stiones. Lib. I. Cap. 1. 

 4 Lection. Memorab. Cent. XIV. p. 14. 



6 It is doubtful whether this was an aurora. 



6 Pharus sive de Prodigiis Ignis Cselest. p. 11. 



7 Sub Tiberio Csesare cohortes in auxiliura Ostiensis eoloniae 

 cucurrerunt tanquam eonflagrantis. Qusest. Nat. I. 15. The 

 same mistake was made at Copenhagen in 1731, and a hundred 

 years later at Konigsberg. It was again repeated at New Orleans 

 in 1839, and in London in 1847. (See note 5, p. 20, right col.) 



B He quotes Josephus, De Bello. Lib. VII. Cap. 12. 



9 Chasles quotes from Lyeosthenes, but Boguslawski says he 

 cannot find the passage. 



10 Untersuchungen iiberd. Wahrscheinliche d. Wetterkunde &c. 



VOL. X. 3 



480. 

 488. 

 501. 

 541. 

 552. 

 555. 2 



Pilgram. 



Berlin. Pilgrara. 



Aug. 22. Edessa ? Frobes, Mairan, 1 Pilgram. 



Pilgram. 



Pilgram. 



Lyeosthenes and Boguslawski. 

 556.? Lyeosthenes and Boguslawski. 8 

 560. Berlin. Pilgram. 



563. Gregory, 4 Quetelet, 6 and Boguslawski. 



564. Frytschius, Tylkowsky, 6 and Frobes. 

 566.' Pilgram. 



567.? Lyeosthenes, Frobes, and Chasles. 

 570. Italy. Frytschius, Lyeosthenes. 

 " Frobes, Pilgram and Chasles. 



Pilgram. 



Paris. Gregory. Lyeosthenes. 



Frobes, Pilgram and Perrey. 8 



Pilgram and Perrey. 



Feb. 4. Frobes, Mairan, 9 Pilgram, Acad. Coll. 10 



Gregory, Frobes and Bertholon. 11 



July. Gregory, Mairan, and Pilgram. 



Sept. x. Gregory, Mairan, and Pilgrara. 

 " x. Gregory, Mairan, and Pilgram. 

 " x. Gregory, Mairan, and Pilgram. 



Gregory ? Frytschius and Frobes. 



Rome. Tylkowsky, Liebknecht, 12 Frobes. 



Pilgram. 



Lyeosthenes, Frobes, and Chasles. 



Pilgram. 



France. Frytschius and Frobes. 



Frytschius and Frobes. 



Rome. Frytschius, Lyeosthenes, Frobes. 



Pilgram. 



Pilgram. 



Pilgram. 



Pilgram. 



1 Traite' Physique et Historique de 1 'Aurore Boreale, p. 180 

 Mairan places this aurora in the year 502. 



2 Annals of Philosophy, IX. 250. Matthews, p. 101. 



3 He quotes Sigebertus in Chronicon ab anno 381 ad 1113. 



4 Gregorius Turonensis Historia Francorum. Lib. IV. Cap. 

 XXXI. 



6 Mem. de l'Acad. Bruxelles, XV. 22. 



6 Physica Curiosa, P. III. p. 246. 



7 Probes describes a strange light seen this year, but it was not 

 probably an aurora. 



8 Compt. Rend. XIV. p. 69. 



9 Mairan quotes Gregoire de Tours. Hist, de France, Liv. VI. 

 p. 299. From the description it appeals to have been a meteor. 



1° Collection Academique, P. Etrang. VI. 507. 

 11 Encyclopedlque Methodique — Physique 1.341. 

 i- Pharus sive de Prodigiis Ignis Cadcst, p. 32. 



577. 

 580. 



a 



582. 

 583. 

 584. 



585. 



587. 

 595. 

 602. 

 603. 

 629. 

 654. 

 673. 

 676. 

 677. 

 752. 

 765. 

 775. 



