EECEEATIVE SCIENCE. 



321 



A CATALOGUE OF ALL THE COMETS WHOSE OEBITS HAVE HITHEETO 



BEEN COMPUTED. 



{Concluded from page 285.) 



1 An apparition of JSieZa'g comet. Theoretical elements. 



* Discovered also by Peters. Visible to the naked eye 

 early in October. Period, 70 years. 



3 Discovered by Schweitzer and C. W. Tuttle, March 8, 

 and by Hartwig, March 10. Elements resemble those of 

 the comet of 1664. 



* Visible to the naked eye in the beginning of May, 

 ■w ith a tail 3' long. 



^ Visible in the daytime, August 31 to September 4. In 

 the south of Europe, a tail 15° long was seen. 



" Perceptible to the naked eye about the middle of the 

 month. Elements resemble those of the comet of 1582. 



' Discovered by Klinkerfess, December 2. 



* First seen in the south of France, when very con- 

 spicuous, with a tail 4^ loug. Elements resemble those of 

 the comet of 1799 (ii). 



* Discovered also by Van Arsdale. At the time of the 

 PP. it was visible to the naked eye. The elements strongly 

 resemble those of the comets of 961 and 1558. 



'" Discovered also by several other observers. 



'1 Discovered by W^innecke and Dien, January 15, 1855. 



'2 Discovered also by Dien and Klinkerfess. Probably 

 a return of the comet of 1362. Period assigned, 493 years. 



'J An apparition of EncJce's comet. 



1* Discovered also by Van Arsdale. 



1' Discovered also by Van Arsdale. Orbit decidedly 

 parabolic. 



£!astbou7^ne. 



1' An apparition of Brorsen's comet, (1846 ii). 



1' Discovered by Dien, July 28, and by Habicht, July 30. 

 Believed to revolve in an elliptic orbit, to which a period of 

 258 years has been assigned. 



's Faintly perceptible to the naked eye, September 

 20. It had a snort tail. Elements resemble those of the 

 comets of 1790 (iii) and 1825 (i). An elliptic orbit, to which 

 a period of 1618 years, has been assigned by Villarceau. 



" Discovered a few hours later by Van Arsdale. 



*" An apparition of D'^»-resf's comrf. Period, 2331 days. 

 Element "q" not pullished, 



*' Discovered by Bruhns, January 11. Probably a re- 

 turn of the comet of 1790 (ii). Period assigned, 13*6 years. 



** An apparition of Pons' comet of 1819 (iii). Period, 

 6-549 years. 



*■' Elements resemble tho'se of the comet of 1799 (ii). 



^* An apparition of Fai/e'n comet. 



25 One of the finest comets of the present century. It 

 became visible to the naked eye early in September, and 

 was very conspicuously seen in Europe for about six weeks, 

 when, owing to its rapid passage to the southern hemisphere, 

 it became lost to view. It was seen at Santiago till March 1, 

 1859. During the first week in October it had a tail nearly 

 40' long. An elliptic orbit; period assigned, 2101 years. 



28 An apparition of Encke's comet. It was very faint. 



*' Theoretical elements of Biela's comet. It was un- 

 favoiu-ably placed for observation, and escaped detection. 



Geo. F. Chambers. 



