^8 TRANSACTIONS OF THE [MAR. 2, 



TJrania. After six numbers had been issued, becoming aware 

 of the existence of an astrological journal of the same name, the 

 editors changed the appellation of their publication to Coperni- 

 cus, under which name three complete volumes were published, 

 the last number of the journal being dated in June, 1884. The 

 discontinuance of the publication of Copernicus was a source of 

 great regret to astronomers, for it occupied a unique position 

 among the journals of its class — a position which, to a very- 

 large extent, has never been occupied b}^ any other publication. 



It is with a view of furnishing a means of reference to the 

 many valuable papers of permanent interest contained in Coper- 

 nicus that the following index has been compiled. It is hoped 

 that it will be found to be a worthy contribution to astronomical 

 bibliography. 



The index is arranged in two parts : the first contains a list 

 of contributors to the journal, with the titles of their papers or 

 articles in chronological order ; the second part contains the 

 contents of the journal, arranged under the various general 

 subjects to which the papers respectively belong. 



The Roman numerals refer to the volumes, the Araljic to the 

 pages. 



The critic will note various departures from the established 

 rules which are supposed to govern the formation of a biblio- 

 graphical index. In extenuation it maybe said that no attempt 

 has been made to follow closely the usual forms and methods, 

 but that the object has been to present the material in the 

 most available form. 



PART I. 



Names of authors and contributors, with the titles of their papers, 

 articles, and notes. 



Backlund, O.— On the Parallax of the Star Bradley, 3077. II., 201. 



Prof. Gylden's Neue Untersuchungen iiber die Theorie der Be- 



wegung der Himmelskorper. II., 203. 

 Bakhuyzen, H. G. v. d. S. — Observations of Brooks' Comet (Comet of 



1812), September 5th and 8th, 1883. III., 181. 

 Ball, R. S. — Researches on the Annual Parallax of the Star Groom- 

 bridge, 1618. I., 16. 



Determination of the Annual Parallax of 6 Cygni B = 2 2486, 



II., 159. 

 BoRGEN, C. — Hiilfstafeln zur Erleichterung der Berechnung von Stern- 

 bedeckungen durch den Mond. I., 8. 



Corrections to Dr. Borgen's paper on Occultations [Ed.]. I., 49. 



Bredechin, Th.— Sur les Queues des Cometes. I., 99. 



Recherches sur les Cometes b et c 1881. II., 1. 



Note supplementaire sur les Cometes b et c (III, et IV.) 1881. 



II., 56. 

 Sur la Comete 1882 I. (Wells). III. , 41 . 



