EEOEEATIVE SCIENCE. 



2«5 



'2 An elliptic orbit; period assigned, 341 years, sub- 

 ject to an uncertainty ot about nine years. Possibly a 

 return of the comet of 1490. 



33 An apparition of Encke' s comet. 



3* Small and faint. 



35 The finest comet of the present century. At one time 

 it had a tail 60^ long. The orbit is remarkable for its small 

 perihelion distance. The period assigned is 376 years. 

 This may be a return of the comet of 1668, but many others 

 have also been supposed to be identical with it. (See 

 Cooper's " Cometic Orbits," pp. 162 — 9.) 



56 Usually known as Faye's comet. It had a very small 

 tail. Period, 7-44 years. 



3' Visible to the naked eye. An elliptic orbit ; period 

 assigned, 5-469 years. It has not been observed since. 

 Possibly identical with the comet of 1678. 



38 Discovered by D'Arrest, July 9. Visible to the naked 

 eye, November 10. Period, 102,050 years. Subject to an 

 uncertainty of 3090 years. 



3' First seen in the southern hemisphere. It had a tail 

 10' long. 



** Discovered by Faye, March 6. 



■•1 Discovered by Bichter, June 6. A fine comet. Visible 

 to the naked eye, with a tail 2^' long. A return of the 

 comet of 1596; period, 250 years. 



••* An apparition of jBKcfce's corned Discovered by Coffin 

 the same evening. 



*3 An elliptic orbit ; period assigned, 2721 years. 



** An apparition of Biela's comet. Discovered by GaUe, 

 November 2S. It was at this return that the comet sepa- 

 rated into two parts. 



■•* An elliptic orbit ; period assigned, 5-58 years. 



•>* Discovered by G. P. Bond, February 26. 



*' Discovered by Hind two hours later. 



*' Discovered by De Vico, July 2. An elliptic orbit ; 

 period assigned, 12'8 years. Subject to an uncertainty ot 

 one year. 



*8 Discovered by Wichmann, May 1. Visible to the 

 naked eye, May 14. An elliptic orbit ; period assigned, 

 400 years. 



*<> Visible in the daytime. It had a tail lY' long. The 

 true elements are probably elliptical. 



*i A parabolic orbit best satisfies the observations. 



•'■"^ Period assigned, 75 years. 



*3 Discovered by Ue Vico, October 3, by Dawes, October 

 7, and by Madame Riiinker, October 11. 



** An apparition of i^Hcie'g come*. Discovered by Hind, 

 September 13. Perceptible to the naked eye, October 6. 

 On November 3 it had a tail more than 1' long. 



*5 A parabolic orbit satislies the observation, but a 

 period of 332,801 years has been assigned ! ! 1 



** It had a small tail. 



*' Discoveredafewhourslaterby Bond, and by Graham, 

 April 14. Period, 8375 years. 



*" Visible to the naked eye, with a tail. Carrington has 

 assigned a period of about 29,000 years. 



** Discovered by Brorsen, Septembers, by Mauvais and 

 Robertson, September 9, and by Clausen, September 14. 



''" The first predicted apparition of Vaye's comet. 



*i Period, 6-441 years. 



*2 Discovered by Schweitzer, August 21. Period assigned, 

 5544 years. 



*3 It had a tail more than 1° long, and also a shorter one 

 turned towards the sun. 



** An apparition of Sncke's comet. 



** Discovered by Petersen, May 17, and by G. P. Bond, 

 May 19. It was very small and faint. Elements resemble 

 those of the comet of 1319 (ii.) 



{To le continued.) ' Geoege F. Chambers. 



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